Re: [osg-users] Picking Problem PolytopeIntersector
Hi, I second Paul on that. Generally speaking, you need some kind of tolerance (or margin) when picking for best user experience. Users dont want to spend time trying to pick an object. And that's exactly what polytope is about. But if you only have large objects (pixel size) in your application, well, line intersector may be just fine. Raphael On Fri, Apr 24, 2009 at 8:04 PM, Jean-Sébastien Guay jean-sebastien.g...@cm-labs.com wrote: Hi Paul, When you do a mouse pick, you generally are trying to pick an object that falls into a small screen-space box around the cursor. In a perspective view, the box has smaller world-space extents at the near plane, and larger world-space extents at the far plane. In essence, it looks like a view frustum. PolytopeIntersector is the only intersector that accurately represents this pick volume. Yes, but this is only a problem if the user clicks on the pixels at the edge of the object (or the limit case, if the object occupies only one pixel on screen). The chances that the user will click just at the edge of the object and the ray will miss are really small. Generally the object is big enough on screen (even if the object occupies 5x5 pixels I'd be surprised to see a user click on the edge, most of the time they'll click in the middle). Every developer is free to make the choices they want. I consider this case much too infrequent, and it has not been a problem for us. I have not had one user tell me hey, I should have selected the object then but I didn't. J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Point matching / Affine transforms
Hi Martin, if you have 2 data sets and a bunch of of feature-points among them to be aligned, I suggest you to try the Iterative Closest Point algorithm http://en.wikipedia.org/wiki/Iterative_Closest_Point I've used it in the past to align 2 partially matching surfaces, and it proved to be very efficient and quick. HTH, Ricky On 27/04/2009 22.51, Martin Beckett wrote: I need to align two data sets in OSG by fitting a small number of key points and calculating the translation/rotation matrices. Normally this is done with a Helmert transform, that defines 7 parameters (xyz translate, xyz rotate, linear scale) to convert between map coordinates. GDAL seems to use Affine transforms instead - it has routine to apply transforms but I can't find anything to calculate them. First has anyone else already done this? Second - since it's going to involve pulling in a lot of Least-Squares/SVD or other solver code is there a preferred numerical library? Martin -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=10933#10933 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Shadows textures
Hi, when i load a model with a texture (.flt or .dae, texture format png or jpg) into my shadowed scene, the textures won't be displayed. Are there any hints to fix this issue ? I've tested the models with the osgshadow-example with the same results... in a non-shadowed scene everything's fine ? With LISP-ShadowMaps the textures are somehow projected onto my model from a wrong view (it seems like the camera-view) and only the contours are visible? I've tested some of the shadow parameters but couldn't achive a result... Thank you for your help Patrock -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11026#11026 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgEarth + OSG 2.8.0 + ATI card
Hi Jason, thanks for your answer. Actually, I just downloaded 2.8.1 rc3, built it and tested my software with those binaries: it solved to problem !!... to some extends... :-( Actually, i think i'm now facing another ATI specific issue: I can start my app, retrieve image and elevation tiles and built my earth model... except that after some time (and this is also true if I use an simple example like osgviewer yahoo_aerial.earth) it seems that my ATI just start mixing all the loaded textures! And in fact it seems to be a quite advanced feature as the mixing is progressive !!! (ie. We have a nice fading effect when you move slowing !!) My guess is, it could be that the graphic card memory is filled with textures, and then the ATI driver start using old texture objects depending on your distance to your model expecting to create a nice fading effect (assuming what we have here are mipmaped textures ?) (except that osgEarth keeps updating all the textures any way, so old textures for a given area are actually replaced by other textures for other areas). Could this make sense ? (or maybe I'm just saying silly things I'm really not an expert when it comes to the low level details like that :-) ). I'm joining a couple of screen capture in a following mail: maybe someone already faced this before. Manu. 2009/4/28 Jason Beverage jasonbever...@gmail.com Hi Emmanuel, Glad to hear osgEarth is working out for you:) Try disabling VBO's by setting the OSG_GL_EXTENSION_DISABLE environment variable to GL_ARB_vertex_buffer_object. This is really a temporary solution, once 2.8.1 is out the door, you can probably just upgrade and it should work fine. Thanks! Jason On Tue, Apr 28, 2009 at 6:12 AM, Emmanuel Roche roche.emman...@gmail.comwrote: Hi everyone ! I've been testing osgEarth for a few days now: it works perfectly on my nvidia cards. But when trying the same application with an ATI cards, the app just shutdowns on some cards, or crashes (with the error mentioned on the osgEarth forum here: http://n2.nabble.com/Ati-error-td2603275.html ) I've read that the rc3 for OSG 2.8.1 comes with a fix item : fixes to display lists/vbo creation that prevent crash under ATI drivers. My question is : do you know if this is related to the problem I'm experiencing currently and has someone already tested osgEarth on a previously crashing ATI cards with that version of OSG ? best regards, Manu. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] Failed to read unsigned int value??
Hi . I am using VPB 0.9.1 only for OSG2.2 -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11029#11029 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Brand New BlackBerry Storm 9500--$250 for sale.
Robert, yes, it happens that spammers just do register on forums to post something there. Mailing lists doesn't look that attractive as forums, therefor there are human controlled spam bots around. In almost 4 months of forum existing there were 2 spam messages out of around 3000 usual messages, so the rate of spamming is still very low. However, you are right that 2 are already to much. I am currently working on the possibility to moderate only the first message of any user. However this takes time, since there are no real good mods for the phpbb forum exists, which can do that. So guys, please be patient, I will try to come up with a solution for that. Cheers, art -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11030#11030 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgEarth + OSG 2.8.0 + ATI card
Hi Manu, On Wed, Apr 29, 2009 at 9:27 AM, Emmanuel Roche roche.emman...@gmail.com wrote: Actually, i think i'm now facing another ATI specific issue: I can start my app, retrieve image and elevation tiles and built my earth model... except that after some time (and this is also true if I use an simple example like osgviewer yahoo_aerial.earth) it seems that my ATI just start mixing all the loaded textures! And in fact it seems to be a quite advanced feature as the mixing is progressive !!! (ie. We have a nice fading effect when you move slowing !!) This sounds like it might be mip mapping at fault. I've not seen this first hand on the ATI card I'm testing with, but I've heard about the issue over the years w.r.t ATI cards. Try updating your OpenGL driver. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] Failed to read unsigned int value??
On Wed, Apr 29, 2009 at 10:02 AM, Akilan akilan.thangam...@gmail.com wrote: Hi . I am using VPB 0.9.1 only for OSG2.2 And any idea what version that .ive database was built for? In general I have to recommend that you upgrade to OSG-2.8.0/2.8.1-rc* and VPB 0.9.10 as they both have lots of bug fixes applied to them. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Brand New BlackBerry Storm 9500--$250 for sale.
On Wed, Apr 29, 2009 at 10:19 AM, Art Tevs arti_t...@yahoo.de wrote: Robert, yes, it happens that spammers just do register on forums to post something there. Mailing lists doesn't look that attractive as forums, therefor there are human controlled spam bots around. In almost 4 months of forum existing there were 2 spam messages out of around 3000 usual messages, so the rate of spamming is still very low. However, you are right that 2 are already to much. I am currently working on the possibility to moderate only the first message of any user. However this takes time, since there are no real good mods for the phpbb forum exists, which can do that. So guys, please be patient, I will try to come up with a solution for that. Thanks for looking in to this. It has to be a general problem that other forums see, so getting at patch for forum.openscenegraph.org may well make lives easier for other communities as well. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Shadows: Application crashing at viewer.renderingTraversals()
Hi,
Im trying to add shadows to my scene, code taken from osgshadow example but my
application crashes when it gets to viewer.renderingTraversals().
If I dont set the setShadowTechnique then my application does not crash, but i
obviously don't get shadows either. Ive tried each of the shadow techniques
without sucess.
Heres my code, can you see any mistakes?
Thank you.
Paul.
Code:
#include stdio.h
#include osgViewer/CompositeViewer
#include osgViewer/Viewer
#include osgGA/TrackballManipulator
#include osgShadow/ShadowedScene
#include osgShadow/ShadowVolume
#include osgShadow/ShadowTexture
#include osgShadow/ShadowMap
#include osgShadow/SoftShadowMap
#include osgShadow/ParallelSplitShadowMap
#include osgShadow/LightSpacePerspectiveShadowMap
#include osgShadow/StandardShadowMap
#include osg/ComputeBoundsVisitor
static int ReceivesShadowTraversalMask = 0x1;
static int CastsShadowTraversalMask = 0x2;
int main(int argc, char **argv)
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(argc, argv);
// construct the viewer.
osgViewer::CompositeViewer viewer(arguments);
// Turn on FSAA, makes the lines look better.
//osg::DisplaySettings::instance()-setNumMultiSamples( 4 );
osg::ref_ptrosgShadow::ShadowedScene shadowedScene = new
osgShadow::ShadowedScene;
shadowedScene-setReceivesShadowTraversalMask(ReceivesShadowTraversalMask);
shadowedScene-setCastsShadowTraversalMask(CastsShadowTraversalMask);
osg::ref_ptrosgShadow::ShadowMap sm = new osgShadow::ShadowMap;
shadowedScene-setShadowTechnique(sm.get());
sm-setTextureSize(osg::Vec2s(1024, 1024));
//osg::ref_ptr osg::Group root = new osg::Group;
osg::ref_ptr osg::Node scene;
scene = osgDB::readNodeFile(cow.osg);
// set up the texture of the base.
osg::StateSet* stateset = new osg::StateSet();
osg::Image* image = osgDB::readImageFile(Images/lz.rgb);
if (image)
{
osg::Texture2D* texture = new osg::Texture2D;
texture-setImage(image);
stateset-setTextureAttributeAndModes(0, texture,
osg::StateAttribute::ON);
}
scene-setStateSet(stateset);
scene-setNodeMask(CastsShadowTraversalMask |
ReceivesShadowTraversalMask);
osg::Vec4 lightpos;
lightpos.set(0.5f, 0.25f, 0.8f, 0.0f);
osg::ref_ptrosg::LightSource ls = new osg::LightSource;
ls-getLight()-setPosition(lightpos);
ls-getLight()-setAmbient(osg::Vec4(0.2, 0.2, 0.2, 1.0));
ls-getLight()-setDiffuse(osg::Vec4(0.8, 0.8, 0.8, 1.0));
osg::ref_ptrosg::MatrixTransform sceneTransform = new
osg::MatrixTransform();
osg::Matrix zTrans = osg::Matrix::translate(0.0f, 0.0f, 0.0f);
sceneTransform-setMatrix(zTrans);
sceneTransform-addChild(scene.get());
shadowedScene-addChild(sceneTransform);
osg::ref_ptrosg::MatrixTransform sceneTransform2 = new
osg::MatrixTransform();
osg::Matrix zTrans2 = osg::Matrix::translate(1.5f, 0.0f, 1.5f);
sceneTransform2-setMatrix(zTrans2);
sceneTransform2-addChild(scene.get());
sceneTransform-addChild(sceneTransform2);
shadowedScene-addChild(ls.get());
osgGA::TrackballManipulator* manipulator;
osgGA::TrackballManipulator* manipulator2;
// Create Editor View
{
osgViewer::Viewer* view = new osgViewer::Viewer();
viewer.addView(view);
osg::Camera* camera = view-getCamera();
camera-setViewport(new osg::Viewport(0, 0, 640, 480));
GLenum buffer = GL_BACK;
camera-setDrawBuffer(buffer);
camera-setReadBuffer(buffer);
camera-setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0)) ;
camera-setCullingMode(camera-getCullingMode()
~osg::CullStack::SMALL_FEATURE_CULLING);
view-setSceneData(shadowedScene.get());
manipulator = new osgGA::TrackballManipulator;
view-setCameraManipulator(manipulator);
manipulator-setHomePosition(osg::Vec3(0, -10, 0), osg::Vec3(0,
0, 0), osg::Vec3(0, 0, 5));
view-setUpViewInWindow(20, 20, 640, 480);
}
// Create Controls View
{
osgViewer::Viewer* view = new osgViewer::Viewer();
viewer.addView(view);
osg::Camera* camera = view-getCamera();
camera-setViewport(new osg::Viewport(0, 0, 640, 480));
GLenum buffer = GL_BACK;
camera-setDrawBuffer(buffer);
camera-setReadBuffer(buffer);
camera-setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0)) ;
camera-setCullingMode(camera-getCullingMode()
~osg::CullStack::SMALL_FEATURE_CULLING);
Re: [osg-users] OpenSceneGraph always opening in fullscreen on Intel integrated graphics.
We have had similar complaints with a qt3.3.8 integrated viewer.In our case
a composite viewer with four views with splitters in between.
I found one 'workaround' which is:
go to the advanced display settings, advanced, troubleshoot and ...
disable hardware acceleration ... .. pff...
but the Intel graphics drivers sometimes don't provide this menu.
If I check the log (with set OSG_NOTIFY_LEVEL=DEBUG) i see:
GraphicsContext::registerGraphicsContext 07391228
close(1)07391228
close(0)07391228
GraphicsContext::unregisterGraphicsContext 07391228
Viewer::startThreading() - starting threading
Viewer::startThreading() - contexts.size()=0
while I should see:
GraphicsContext::registerGraphicsContext 0x95187f8
Relaxing traits
GraphicsContext::createNewContextID() creating contextID=0
Updating the MaxNumberOfGraphicsContexts to 1
Viewer::startThreading() - starting threading
Viewer::startThreading() - contexts.size()=1
Any suggestions are very welcome.
Rene
2009/4/27 Jesper D. Thomsen j...@anybodytech.com
Hi, I'm not currently using multisampling in the window, as we have an
option in the application where we can switch to an older OpenGL renderer
for the viewport, and this older implementation doesn't like multisampling.
I'm however not having any problems with OpenGL state, as I don't use any
direct OpenGL in the cases where I'm having the fullscreen problem.
I just dug up an old computer with integrated Intel 82865G graphics (which
supports OpenGL 1.3), and that computer works fine with windowed
OpenSceneGraph use (even with standard Windows XP graphics drivers).
regards,
Jesper D. Thomsen
**
--
*From:* osg-users-boun...@lists.openscenegraph.org [
osg-users-boun...@lists.openscenegraph.org] On Behalf Of Ümit Uzun [
umituzu...@gmail.com]
*Sent:* Monday, April 27, 2009 11:14 AM
*To:* OpenSceneGraph Users
*Subject:* Re: [osg-users] OpenSceneGraph always opening in fullscreen on
Intel integrated graphics.
Hi Jesper;
As I can see from attached codes you didn't used traits-samples = (any int
value); but you may be set multisampling in your code from using
osg::DisplaySettings* ds = new osg::DisplaySettings();
ds-setNumMultiSamples( 4 );
or osgUtil namespaces function(I have forgotten the name of this
function.).
If you try to anti aliasing operation by using MultiSampling, this could be
cause full screen problem which I had had kind of that before and solved by
removing multisampling operation.
HTH.Regards.
2009/4/27 Jesper D. Thomsen j...@anybodytech.com
Hi all (again), and thanks for your help in the past.
We have now shipped an application using OpenSceneGraph for the 3D
viewports of a model. We are now receiving a couple of bug-reports (2 so
far) from users running the application on laptops with Intel integrated
graphics (GMA 950 and 3100). We are using OpenSceneGraph in an MFC window in
the application, but whenever these two users open the viewport window (and
thus starting the OpenSceneGraph part of the application), the
OpenSceneGraph viewer starts in fullscreen (no menus or windows bar
visible), which of course means that they have to use the task manager to
quit the application.
Both users are using Windows XP pro. The OSG version used is 2.6.1,
compiled with Visual Studio 2005 SP1 under Vista. The application is using
MFC, and the OpenSceneGraph viewport is based on the MFCViewer example. The
code for creating the viewer can be found below. Does anybody know why OSG
suddenly will be forced to work in fullscreen, and is it generally because
of some specific lack of OpenGL support?
Any help will be much appreciated.
--- Code: --
void
cOSG::InitCameraConfig(void)
{
// Local Variable to hold window size data
RECT rect;
// Create the viewer for this window
mViewer =
new osgViewer::Viewer();
mViewer-setThreadingModel(osgViewer::Viewer::SingleThreaded);
// Get the current window size
::GetWindowRect(m_hWnd, rect);
// Init the GraphicsContext Traits
osg::ref_ptrosg::GraphicsContext::Traits traits =
new osg::GraphicsContext::Traits;
// Init the Windata Variable that holds the handle for the Window to
display OSG in.
osg::ref_ptrosg::Referenced windata =
new osgViewer::GraphicsWindowWin32::WindowData(m_hWnd);
// Setup the traits parameters
traits-x = 0;
traits-y = 0;
traits-width = rect.right - rect.left;
traits-height = rect.bottom - rect.top;
traits-windowDecoration =
false;
traits-doubleBuffer =
true;
traits-sharedContext = 0;
traits-setInheritedWindowPixelFormat =
true;
traits-inheritedWindowData = windata;
// Create the Graphics Context
osg::GraphicsContext* gc =
osg::GraphicsContext::createGraphicsContext(traits.get());
// Init a new Camera (Master for this View)
camera = mViewer-getCamera();
// Assign Graphics Context to the Camera
camera-setGraphicsContext(gc);
// Set the viewport for the Camera
camera-setViewport(
[osg-users] Blender/Maya importer
Hi, To be honest, I switched from OSG to OGRE some time ago, but hopefully yo will forgive me and help me with my problem. I need to establish a communication between an OGRE-visualisation and an OSG-framework, that produces .ive-files. Is it possible to convert these ive-files into ogre .meshes and .materials directly, or at least into a file Blender, Maya or 3DStudioMax could read? In your wiki I found a Blender exporter, transforming into OSG, but not the other way round. And the links to osgmaya (an importer for Maya) and a similar program for 3DS didnt work. As Blender is a freeware, it would be really great to be able to import and visualize .ive-scenes in it (I could then export it to .mesh for OGRE). Does anyone of you know a (working) importer for Blender? Thank you a lot! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11036#11036 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Point matching / Affine transforms
In my application I know that the points are an almost perfect match - I just need to snap two models together based on key points. ICP is good for fitting surfaces together (although there are a bunch of other relaxation type algorithms that work). I was mainly looking for something that could be implemented fairly simply rather than having to include the whole of CGAL or LAPACK. Martin ps. If you have some ICP example code - that would be great! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11037#11037 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgEarth + OSG 2.8.0 + ATI card
Hi Robert, I've already updated my drivers... yesterday :-) So I'm afraid this won't help so much for now. Can you tell me which ATI card you are using ? We are experiencing the same problems here with a Mobility Radeon X1900 and a Radeon HD 3650. Manu. 2009/4/29 Robert Osfield robert.osfi...@gmail.com Hi Manu, On Wed, Apr 29, 2009 at 9:27 AM, Emmanuel Roche roche.emman...@gmail.com wrote: Actually, i think i'm now facing another ATI specific issue: I can start my app, retrieve image and elevation tiles and built my earth model... except that after some time (and this is also true if I use an simple example like osgviewer yahoo_aerial.earth) it seems that my ATI just start mixing all the loaded textures! And in fact it seems to be a quite advanced feature as the mixing is progressive !!! (ie. We have a nice fading effect when you move slowing !!) This sounds like it might be mip mapping at fault. I've not seen this first hand on the ATI card I'm testing with, but I've heard about the issue over the years w.r.t ATI cards. Try updating your OpenGL driver. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Point matching / Affine transforms
Hi Martin, unfortunately I don't have any example code to share right now... I've seen from wikipedia that c++ and matlab implementation exist, maybe you can take a look. I can guarantee that if you have good feature points, the algorithm is going to run fast and give good results. I had done a lot of work to extract significant feature points from my clouds. What I can also suggest is to try some of the variants suggested here, they really improve speed and stability: Efficient Variants of the ICP Algorithm http://graphics.stanford.edu/papers/fasticp/ http://graphics.stanford.edu/papers/fasticp/ Good luck! Ricky On 29/04/2009 15.13, Martin Beckett wrote: In my application I know that the points are an almost perfect match - I just need to snap two models together based on key points. ICP is good for fitting surfaces together (although there are a bunch of other relaxation type algorithms that work). I was mainly looking for something that could be implemented fairly simply rather than having to include the whole of CGAL or LAPACK. Martin ps. If you have some ICP example code - that would be great! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11037#11037 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgEarth + OSG 2.8.0 + ATI card
On Wed, Apr 29, 2009 at 2:29 PM, Emmanuel Roche roche.emman...@gmail.com wrote: Hi Robert, I've already updated my drivers... yesterday :-) So I'm afraid this won't help so much for now. Can you tell me which ATI card you are using ? I have a 4670. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Picking Problem PolytopeIntersector
Hello Martin, I have a model with lots of points and I want to find the front/first point under the mouse click (quickly) Options are a polytrope intersector with a small box (2x2 5x5 pixels). What if I used a few line lineintersectors spaced a pixel apart, would that be faster? LineSegmentIntersector will not find points (at all). Even for 3D geometry, I wouldn't suggest using multiple LineSegmentIntersections because then you might miss objects (between the lines) - you're subject to sampling issues. PolytopeIntersector will not order results in closest-first fashion, but for points, you can do that yourself. Just order by the distance between the camera's eye point and the given point. This is possible for points but not for general geometry, for example imagine a bowl containing fruit, and picking from above: || || polytope \ | / | \/ bowl with fruit \_oOOo_/ The polytope above will pick both the fruit and the bowl, but which one is closest? The bowl is closest for part of the polytope, but the fruit are closest for another part. Since points are zero-dimensional you can order them by distance without ambiguity. Also is there a way to use the colour under the mouse cursor to quickly check if there is a point (by comparing to background) before doing the intersector? You could do that yourself by doing a readPixel in the mouse x,y point that was clicked. But it might be slow because it will flush the graphics fifo, and in general it won't work because the background might not be the clear color (if you have a skydome/skybox, or an environment in your scene). But if you want to try it, the way I'd do this is to delay the actual picking for one frame. Have your event handler add a camera post-draw callback that does an osg::Image::readPixels for the current camera and checks for those x,y. If there's an object there, it can then do the actual intersection test or whatever you want. The camera post-draw callback then removes itself (so it isn't used for all frames, just the frames where a pick was attempted - the osgViewer::ScreenCaptureHandler does this so that it takes a screenshot only once). Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Problem with ReadWriterOSG.cpp and osgDB::setDataFilePathList
Hi All, I have an issue with loading .osg files. I would like to be able to specify the directories from which the internally referenced files of a .osg file are loaded. This can largely be achieved by using osgDB::setDataFilePathList or setting the database path on an instance of ReaderWriter::Options when calling osgDB::readNodeFile. However I have a problem. Internally referenced files in the same directory as the .osg file (current directory) will always be preferred to those in other directories specified on the data path list even if the current directory is on the data path list. This is causing me problems when trying to do resource localisation in the following way: The directory Test (see below) contains a default version of bar.png, directories fr-FR and en-GB containing localised versions of bar.png and foo.osg that references bar.png. Test foo.osg bar.png fr-FR bar.png en-GB bar.png What I would like to happen is that bar.png in fr-FR is loaded instead of the default when the data path is setup as (Test/fr-FR/,Test/). If bar.png doesn't exist in the localised directory then the default is loaded. What is stopping this happening is the following line in .../src/osgPlugins/ReadWriterOSG.cpp local_opt-getDatabasePathList().push_front(osgDB::getFilePath(fileName) ); This always adds the directory of the .osg file to the front of the data path list so internally referenced files will always be loaded from that directory irrespective of how the data path has initially been constructed. There are a number of ways ReadWriterOSG.cpp could be changed to resolve this issue: 1. Only add the directory of the .osg file if it isn't already on the data path. 2. Add a flag to ReaderWriter::Options to indicate that the directory should not be added to the path. 3. Some combination of 1 and 2. This logic could be put into ReaderWriter::Options to make it available to other plugins. Any ideas? Thanks, Morgan. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] PagedLOD
I think you can solve what you want by making sure your own pseudo loader is used instead. You do this by adding some extension (.ott_terrain, .ott_model, ...) to the filenames of the children of your PagedLODs and you register a ReaderWriter that supports those extensions. You can then in your ReaderWriter remove the extension and load the real file with the right loader by calling osgDB::readNodeFile as usual and then do the postprocessing of the node. Note that all this will be done in a thread created by DatabasePager. If you need to do some postprocessing in your main scenegraph thread you can add a callback (update callback or cull callback) to the node. If you need an example how this can be done please have a look at osgEarth. Good luck! /Jakob Ruhe 2009/4/28 Alan Ott a...@signal11.us: Robert and Bryan, Thanks for the info. From this, it seems like I can get a handle to the newly loaded node before it gets added to the main tree. The only thing now is that once I've got a handle to this node, I don't really know _what_ the node is supposed to be (is it a terrain tile, a moving model? etc.). ReadFileCallback::readNode() gives me the ReaderWriterOptions, and it seems like I could make a new option string telling me how to post-process this model load, but I can't see how in PagedLOD to set ReaderWriterOptions. PagedLOD has the setDatabaseRequest() function, which based on another mailing list post, looks like it is to be used as a user data pointer. The problem here is that I don't know how to get this object from inside the ReadFileCallback. I simply need to tag each request (made by the PagedLOD) as terrain or model so that I know specifically what initialization to do in the ReadFileCallback. Am I missing something obvious here? Thanks for your help, Alan. Robert Osfield wrote: Hi Alan, As Bryan wrote, what you need is to write a custom osgDB::Registry::ReadFileCallback that will intercept all DB calls, you then leave it up to Registry itself to the do the reading from the plugin, but then you process the loaded data before passing the end result back from the callback. Have a look at the ReadFileCallback implementation and study the default implementations, this should give you a clue how to put it together. Robert. On Mon, Apr 27, 2009 at 10:40 PM, Alan Ott a...@signal11.us wrote: Hello, I'm using PagedLOD to load terrain tiles off disk. The problem I have is that before I want the tile to actually render, I want to do a setup of the tile (to look up certain control nodes and set switches according to the current state of the system (eg: day/night mode, etc)). So on my own update(), I check to see if each PagedLOD has just loaded, and if it has, I run the initialization on it. The problem is, when a tile gets loaded, it is rendered for one frame _before_ I can do my initialization on it. So for one frame, it is drawn wrong, then the next frame, it is drawn right. I thought I might be able to get around this by setting the Node Mask to 0 until it was initialized, but that seems to just keep the tiles from getting loaded entirely (because the update traverser isn't getting into the PagedLOD either). Do any of you have any ideas of what I could try to do to get around this? Is there some value of the NodeMask that I could use to enable update but not draw? Such a value did not seem to be documented in the API. Thanks for all your help, Alan. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] unable to glReadPixels in osg::Drawable::drawImplementation
Hi, I'm trying to implement a custom osg::Drawable which need to check the depth component of a certain pixel before rendering itself. The problem is, glReadPixels always returns 1.0 (even for the entire viewport, which obviously should not be possible). I didn't touch the default settings of depth test/range. Can anyone guess what the problem might be? ... Thank you. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11044#11044 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] unable to glReadPixels inosg::Drawable::drawImplementation
The best bet any of can give you is that your code is probably the problem But as you don't show the code your usingwho knows Gordon Product Manager 3d __ Gordon Tomlinson Email : gtomlinson @ overwatch.textron.com __ -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Can Hosgor Sent: Wednesday, April 29, 2009 11:12 AM To: osg-users@lists.openscenegraph.org Subject: [osg-users] unable to glReadPixels inosg::Drawable::drawImplementation Hi, I'm trying to implement a custom osg::Drawable which need to check the depth component of a certain pixel before rendering itself. The problem is, glReadPixels always returns 1.0 (even for the entire viewport, which obviously should not be possible). I didn't touch the default settings of depth test/range. Can anyone guess what the problem might be? ... Thank you. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11044#11044 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] frustum culling in shader
Hi everyone, Just again a simple problem I can't solve myself: I have an sphere object I want to use as a sky sphere. What's the best wait to do that ??? The idea I came to is to use a vertex shader to offset each of the sphere vertex by the current position of the camera in the model frame. But then nothing is displayed because the moved vertices are behind the near plane and are culled :-( Any idea ? I guess I'm not the first one trying to render a sky sphere any way ?? thanks for your help. manu. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem with ReadWriterOSG.cpp and osgDB::setDataFilePathList
Hi Morgan, Adding a ReaderWriter::Option::OptionsString entry would probably be the most straight forward way to hint to the plugins not include the local file directory when searching. Feel free to add the necessary code to OSG plugin and submit the changes to the osg-submissions list. Cheers, Robert. On Wed, Apr 29, 2009 at 3:43 PM, Morgan Willis morg...@aristechnologies.com wrote: Hi All, I have an issue with loading .osg files. I would like to be able to specify the directories from which the internally referenced files of a .osg file are loaded. This can largely be achieved by using osgDB::setDataFilePathList or setting the database path on an instance of ReaderWriter::Options when calling osgDB::readNodeFile. However I have a problem. Internally referenced files in the same directory as the .osg file (current directory) will always be preferred to those in other directories specified on the data path list even if the current directory is on the data path list. This is causing me problems when trying to do resource localisation in the following way: The directory Test (see below) contains a default version of bar.png, directories fr-FR and en-GB containing localised versions of bar.png and foo.osg that references bar.png. Test foo.osg bar.png fr-FR bar.png en-GB bar.png What I would like to happen is that bar.png in fr-FR is loaded instead of the default when the data path is setup as (Test/fr-FR/,Test/). If bar.png doesn’t exist in the localised directory then the default is loaded. What is stopping this happening is the following line in .../src/osgPlugins/ReadWriterOSG.cpp local_opt-getDatabasePathList().push_front(osgDB::getFilePath(fileName)); This always adds the directory of the .osg file to the front of the data path list so internally referenced files will always be loaded from that directory irrespective of how the data path has initially been constructed. There are a number of ways ReadWriterOSG.cpp could be changed to resolve this issue: 1. Only add the directory of the .osg file if it isn’t already on the data path. 2. Add a flag to ReaderWriter::Options to indicate that the directory should not be added to the path. 3. Some combination of 1 and 2. This logic could be put into ReaderWriter::Options to make it available to other plugins. Any ideas? Thanks, Morgan. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] PagedLOD
Alan Ott wrote on Tuesday, April 28, 2009 10:34 AM: Thanks for the info. From this, it seems like I can get a handle to the newly loaded node before it gets added to the main tree. The only thing now is that once I've got a handle to this node, I don't really know _what_ the node is supposed to be (is it a terrain tile, a moving model? etc.). ReadFileCallback::readNode() gives me the ReaderWriterOptions, and it seems like I could make a new option string telling me how to post-process this model load, but I can't see how in PagedLOD to set ReaderWriterOptions. Unfortunately, at the moment PagedLOD doesn't have a way to specify ReaderWriterOptions (and adding that ability is a little complicated, because we don't want a circular dependency between osg and osgDB). One thing you can do is subclass PagedLOD in your app to add the ability to specify a ReaderWriterOptions when it calls readNode(). PagedLOD has the setDatabaseRequest() function, which based on another mailing list post, looks like it is to be used as a user data pointer. The problem here is that I don't know how to get this object from inside the ReadFileCallback. This makes me think you're using an older version of OSG? The latest OSG in svn only has getDatabaseRequest() (which you can use to set the DatabaseRequest). In any case, the database request isn't really for user data; it is specifically for osgDB::DatabasePager use. Robert Osfield wrote: As Bryan wrote, what you need is to write a custom osgDB::Registry::ReadFileCallback that will intercept all DB calls, you then leave it up to Registry itself to the do the reading from the plugin, but then you process the loaded data before passing the end result back from the callback. Have a look at the ReadFileCallback implementation and study the default implementations, this should give you a clue how to put it together. On Mon, Apr 27, 2009 at 10:40 PM, Alan Ott a...@signal11.us mailto:a...@signal11.us wrote: I'm using PagedLOD to load terrain tiles off disk. The problem I have is that before I want the tile to actually render, I want to do a setup of the tile (to look up certain control nodes and set switches according to the current state of the system (eg: day/night mode, etc)). So on my own update(), I check to see if each PagedLOD has just loaded, and if it has, I run the initialization on it. The problem is, when a tile gets loaded, it is rendered for one frame _before_ I can do my initialization on it. So for one frame, it is drawn wrong, then the next frame, it is drawn right. I thought I might be able to get around this by setting the Node Mask to 0 until it was initialized, but that seems to just keep the tiles from getting loaded entirely (because the update traverser isn't getting into the PagedLOD either). Do any of you have any ideas of what I could try to do to get around this? Is there some value of the NodeMask that I could use to enable update but not draw? Such a value did not seem to be documented in the API. -- Bryan Thrall FlightSafety International bryan.thr...@flightsafety.com ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] frustum culling in shader
So you are effectively rendering the sphere in eye coordinates. Have you tried simply projecting the coordinates (in the vertex shader) onto the far plane and rendering them there? The coordinates will (of course) need to be between the near and far plane in order to not be clipped, so just projecting them into that range (and ideally onto the far plane) should do the trick. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com http://www.skew-matrix.com/ +1 303 859 9466 _ From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Emmanuel Roche Sent: Wednesday, April 29, 2009 9:28 AM To: OSG Users Subject: [osg-users] frustum culling in shader Hi everyone, Just again a simple problem I can't solve myself: I have an sphere object I want to use as a sky sphere. What's the best wait to do that ??? The idea I came to is to use a vertex shader to offset each of the sphere vertex by the current position of the camera in the model frame. But then nothing is displayed because the moved vertices are behind the near plane and are culled :-( Any idea ? I guess I'm not the first one trying to render a sky sphere any way ?? thanks for your help. manu. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] frustum culling in shader
Hi Emmanuel,
I have an sphere object I want to use as a sky sphere. What's the best
wait to do that ???
There's been discussion over the last few days about ways to disable
auto near/far calculation and override the far plane setting for a
skydome / sphere. See this thread:
http://thread.gmane.org/gmane.comp.graphics.openscenegraph.user/43442
It's a little convoluted but I ended up with something that worked well.
The sphere itself you can do whatever way you want. I prefer to have a
large sphere that is in the scene (i.e. that doesn't move with the eye
point) but you may want it to move, in which case I think the easiest
way is to use a transform that places it in the right place automatically:
class MoveWithCameraTransform : public osg::Transform
{
public:
// Get the transformation matrix which moves from local coords
to world coords.
virtual bool computeLocalToWorldMatrix(osg::Matrix matrix,
osg::NodeVisitor* nv) const
{
osgUtil::CullVisitor* cv =
dynamic_castosgUtil::CullVisitor*(nv);
if (cv)
{
osg::Vec3 eyePointLocal = cv-getEyeLocal();
matrix.preMult(osg::Matrix::translate(eyePointLocal));
}
return true;
}
// Get the transformation matrix which moves from world coords
to local coords.
virtual bool computeWorldToLocalMatrix(osg::Matrix matrix,
osg::NodeVisitor* nv) const
{
osgUtil::CullVisitor* cv =
dynamic_castosgUtil::CullVisitor*(nv);
if (cv)
{
osg::Vec3 eyePointLocal = cv-getEyeLocal();
matrix.postMult(osg::Matrix::translate(-eyePointLocal));
}
return true;
}
};
If you use this, you don't need to muck around with the auto near/far
calculation like I did. You can use a sphere of very small size and use
an osg::Depth that sets fragments only at the far plane, rendering it
after all other opaque objects have been rendered (but before
transparent ones so they will be blended with the sky if needed):
// ss is the skydome's stateset.
// Transparent bin is #10 by default so render just before
// transparent objects.
ss-setRenderBinDetails(9, RenderBin);
ss-setAttributeAndModes(
new osg::Depth(osg::Depth::LEQUAL, 1.0, 1.0),
osg::StateAttribute::ON);
Hope this helps,
J-S
--
__
Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.webhop.org/
___
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] unable to glReadPixels in osg::Drawable::drawImplementation
looks like the problem isn't with the code itself, but the scene graph that gets rendered before somehow didn't write to the depth buffer. sorry for bothering you, can -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11053#11053 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgEarth + OSG 2.8.0 + ATI card
Hi Manu, Are you using a cache for your .earth files? If so, try deleting your disk cache and see if that helps. Also, what version of osgEarth are you using 1.0 or 1.1? 1.1 added support for mixing mercator and geodetic sources, which can sometimes result in non-power-of-two textures being used. I wonder if perhaps there is an issue with your card and NPOT. Thanks, Jason On Wed, Apr 29, 2009 at 4:49 AM, Emmanuel Roche roche.emman...@gmail.comwrote: Here are a few screen captures... Note the half visible groenland on the right side on picture 2 (with part of africa on the right :-) ). Or the low level Europe map on the left on picture 1. The position of the camera is somewhere next to munich in Germany ! If I don't move the camera the textures eventually change but they are replaced by other incorrect textures :-( So if you have any idea what I could try here this could be very helpful. Manu. 2009/4/29 Emmanuel Roche roche.emman...@gmail.com Hi Jason, thanks for your answer. Actually, I just downloaded 2.8.1 rc3, built it and tested my software with those binaries: it solved to problem !!... to some extends... :-( Actually, i think i'm now facing another ATI specific issue: I can start my app, retrieve image and elevation tiles and built my earth model... except that after some time (and this is also true if I use an simple example like osgviewer yahoo_aerial.earth) it seems that my ATI just start mixing all the loaded textures! And in fact it seems to be a quite advanced feature as the mixing is progressive !!! (ie. We have a nice fading effect when you move slowing !!) My guess is, it could be that the graphic card memory is filled with textures, and then the ATI driver start using old texture objects depending on your distance to your model expecting to create a nice fading effect (assuming what we have here are mipmaped textures ?) (except that osgEarth keeps updating all the textures any way, so old textures for a given area are actually replaced by other textures for other areas). Could this make sense ? (or maybe I'm just saying silly things I'm really not an expert when it comes to the low level details like that :-) ). I'm joining a couple of screen capture in a following mail: maybe someone already faced this before. Manu. 2009/4/28 Jason Beverage jasonbever...@gmail.com Hi Emmanuel, Glad to hear osgEarth is working out for you:) Try disabling VBO's by setting the OSG_GL_EXTENSION_DISABLE environment variable to GL_ARB_vertex_buffer_object. This is really a temporary solution, once 2.8.1 is out the door, you can probably just upgrade and it should work fine. Thanks! Jason On Tue, Apr 28, 2009 at 6:12 AM, Emmanuel Roche roche.emman...@gmail.com wrote: Hi everyone ! I've been testing osgEarth for a few days now: it works perfectly on my nvidia cards. But when trying the same application with an ATI cards, the app just shutdowns on some cards, or crashes (with the error mentioned on the osgEarth forum here: http://n2.nabble.com/Ati-error-td2603275.html ) I've read that the rc3 for OSG 2.8.1 comes with a fix item : fixes to display lists/vbo creation that prevent crash under ATI drivers. My question is : do you know if this is related to the problem I'm experiencing currently and has someone already tested osgEarth on a previously crashing ATI cards with that version of OSG ? best regards, Manu. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Intersection
Hi, Is there any intersection callback that we can assign to a node, to be able to perform intersection with custom render drawables ? Regards, Cristina Thank you. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11055#11055 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Blender/Maya importer
Hi Meyer, you could also take the collada route, since OSG dae plugin can write to files and Blender has also collada importers. Regards, Alberto El Miércoles 29 Abril 2009ES 15:13:05 Meyer escribió: Hi, To be honest, I switched from OSG to OGRE some time ago, but hopefully yo will forgive me and help me with my problem. I need to establish a communication between an OGRE-visualisation and an OSG-framework, that produces .ive-files. Is it possible to convert these ive-files into ogre .meshes and .materials directly, or at least into a file Blender, Maya or 3DStudioMax could read? In your wiki I found a Blender exporter, transforming into OSG, but not the other way round. And the links to osgmaya (an importer for Maya) and a similar program for 3DS didnt work. As Blender is a freeware, it would be really great to be able to import and visualize .ive-scenes in it (I could then export it to .mesh for OGRE). Does anyone of you know a (working) importer for Blender? Thank you a lot! ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Intersection
Hi Cristina, El Miércoles 29 Abril 2009ES 18:37:16 Cristina escribió: Hi, Is there any intersection callback that we can assign to a node, to be able to perform intersection with custom render drawables ? You have to subclass your own class for that kind of drawables, since you are the only one that knows how they are built. For example, if I had a custom drawable that drew a sphere, I should subclass the intersectionvisitor to take advantage of its equation x^2+y^2+z^2=r^2 when it arrives to my special drawable. Regards, Alberto ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Intersection
Hi Cristima, You'll need to implement the Drawable::accept(PrimtiveFunctor) method to enable the standard intersection routes etc. to be able to query your geometry. Have a look at the Geometry::accept(PrimitiveFunctor) and ShapeDrawable::accept(PrimitiveFunctor) to how it's done. Robert. On Wed, Apr 29, 2009 at 5:37 PM, Cristina cristina.pap...@meggitt.com wrote: Hi, Is there any intersection callback that we can assign to a node, to be able to perform intersection with custom render drawables ? Regards, Cristina Thank you. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11055#11055 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] frustum culling in shader
Hi Paul, well, actually, I'm not exactly rendering directly in eye coordinates (provided I understand what you mean): the sphere should not rotate with the camera (in fact I'm not rendering a sphere: rather points representing stars by the way). But your idea is very good: until now, I was using something like: gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * myModifiedVertexPos; == I'm computing the modified vertex position by offseting the gl_Vertex by the camera position in the model frame. Now that you mention it I realize my error must come from the usage of the gl_ProjectionMatrix which is the latest projection matrix computed by OSG (using the initial sphere vertices). I'm not familiar at all with projection matrices computation, but I will give it a try tomorrow :-). thanks for your help. Manu. 2009/4/29 Paul Martz pma...@skew-matrix.com So you are effectively rendering the sphere in eye coordinates. Have you tried simply projecting the coordinates (in the vertex shader) onto the far plane and rendering them there? The coordinates will (of course) need to be between the near and far plane in order to not be clipped, so just projecting them into that range (and ideally onto the far plane) should do the trick. Paul Martz *Skew Matrix Software LLC* http://www.skew-matrix.com +1 303 859 9466 -- *From:* osg-users-boun...@lists.openscenegraph.org [mailto: osg-users-boun...@lists.openscenegraph.org] *On Behalf Of *Emmanuel Roche *Sent:* Wednesday, April 29, 2009 9:28 AM *To:* OSG Users *Subject:* [osg-users] frustum culling in shader Hi everyone, Just again a simple problem I can't solve myself: I have an sphere object I want to use as a sky sphere. What's the best wait to do that ??? The idea I came to is to use a vertex shader to offset each of the sphere vertex by the current position of the camera in the model frame. But then nothing is displayed because the moved vertices are behind the near plane and are culled :-( Any idea ? I guess I'm not the first one trying to render a sky sphere any way ?? thanks for your help. manu. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] PagedLOD
Thrall, Bryan wrote: Alan Ott wrote on Tuesday, April 28, 2009 10:34 AM: Thanks for the info. From this, it seems like I can get a handle to the newly loaded node before it gets added to the main tree. The only thing now is that once I've got a handle to this node, I don't really know _what_ the node is supposed to be (is it a terrain tile, a moving model? etc.). ReadFileCallback::readNode() gives me the ReaderWriterOptions, and it seems like I could make a new option string telling me how to post-process this model load, but I can't see how in PagedLOD to set ReaderWriterOptions. Unfortunately, at the moment PagedLOD doesn't have a way to specify ReaderWriterOptions (and adding that ability is a little complicated, because we don't want a circular dependency between osg and osgDB). One thing you can do is subclass PagedLOD in your app to add the ability to specify a ReaderWriterOptions when it calls readNode(). PagedLOD has the setDatabaseRequest() function, which based on another mailing list post, looks like it is to be used as a user data pointer. The problem here is that I don't know how to get this object from inside the ReadFileCallback. This makes me think you're using an older version of OSG? The latest OSG in svn only has getDatabaseRequest() (which you can use to set the DatabaseRequest). In any case, the database request isn't really for user data; it is specifically for osgDB::DatabasePager use. Robert Osfield wrote: As Bryan wrote, what you need is to write a custom osgDB::Registry::ReadFileCallback that will intercept all DB calls, you then leave it up to Registry itself to the do the reading from the plugin, but then you process the loaded data before passing the end result back from the callback. Have a look at the ReadFileCallback implementation and study the default implementations, this should give you a clue how to put it together. On Mon, Apr 27, 2009 at 10:40 PM, Alan Ott a...@signal11.us mailto:a...@signal11.us wrote: I'm using PagedLOD to load terrain tiles off disk. The problem I have is that before I want the tile to actually render, I want to do a setup of the tile (to look up certain control nodes and set switches according to the current state of the system (eg: day/night mode, etc)). So on my own update(), I check to see if each PagedLOD has just loaded, and if it has, I run the initialization on it. The problem is, when a tile gets loaded, it is rendered for one frame _before_ I can do my initialization on it. So for one frame, it is drawn wrong, then the next frame, it is drawn right. I thought I might be able to get around this by setting the Node Mask to 0 until it was initialized, but that seems to just keep the tiles from getting loaded entirely (because the update traverser isn't getting into the PagedLOD either). Do any of you have any ideas of what I could try to do to get around this? Is there some value of the NodeMask that I could use to enable update but not draw? Such a value did not seem to be documented in the API. Bryan, You are right. I didn't read closely enough, and there is no setDatabaesRequest(). I am using OSG 2.6. You had a good idea with the subclassing of PagedLOD and the options, but what I ended up doing was I think simpler. I subclassed PagedLOD and overrode the addChild() method, calling my init function from the override. This way I could have all the user data I want (with pointers to my own objects), which would not have been possible from the callback. Thanks for your help, Alan. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] PagedLOD
Alan Ott wrote on Wednesday, April 29, 2009 3:22 PM: You are right. I didn't read closely enough, and there is no setDatabaesRequest(). I am using OSG 2.6. You had a good idea with the subclassing of PagedLOD and the options, but what I ended up doing was I think simpler. I subclassed PagedLOD and overrode the addChild() method, calling my init function from the override. This way I could have all the user data I want (with pointers to my own objects), which would not have been possible from the callback. Thanks for your help, Yes, that works, too :) Glad I could help, -- Bryan Thrall FlightSafety International bryan.thr...@flightsafety.com ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] PagedLOD
Jakob, Thanks for the idea. What I ended up doing was subclassing PagedLOD and overriding the addChild() method and doing the init from my overridden method. This way, I could have pointers to my own objects, which were necessary for the initialization. Thanks for your help, Alan. Jakob Ruhe wrote: I think you can solve what you want by making sure your own pseudo loader is used instead. You do this by adding some extension (.ott_terrain, .ott_model, ...) to the filenames of the children of your PagedLODs and you register a ReaderWriter that supports those extensions. You can then in your ReaderWriter remove the extension and load the real file with the right loader by calling osgDB::readNodeFile as usual and then do the postprocessing of the node. Note that all this will be done in a thread created by DatabasePager. If you need to do some postprocessing in your main scenegraph thread you can add a callback (update callback or cull callback) to the node. If you need an example how this can be done please have a look at osgEarth. Good luck! /Jakob Ruhe 2009/4/28 Alan Ott a...@signal11.us: Robert and Bryan, Thanks for the info. From this, it seems like I can get a handle to the newly loaded node before it gets added to the main tree. The only thing now is that once I've got a handle to this node, I don't really know _what_ the node is supposed to be (is it a terrain tile, a moving model? etc.). ReadFileCallback::readNode() gives me the ReaderWriterOptions, and it seems like I could make a new option string telling me how to post-process this model load, but I can't see how in PagedLOD to set ReaderWriterOptions. PagedLOD has the setDatabaseRequest() function, which based on another mailing list post, looks like it is to be used as a user data pointer. The problem here is that I don't know how to get this object from inside the ReadFileCallback. I simply need to tag each request (made by the PagedLOD) as terrain or model so that I know specifically what initialization to do in the ReadFileCallback. Am I missing something obvious here? Thanks for your help, Alan. Robert Osfield wrote: Hi Alan, As Bryan wrote, what you need is to write a custom osgDB::Registry::ReadFileCallback that will intercept all DB calls, you then leave it up to Registry itself to the do the reading from the plugin, but then you process the loaded data before passing the end result back from the callback. Have a look at the ReadFileCallback implementation and study the default implementations, this should give you a clue how to put it together. Robert. On Mon, Apr 27, 2009 at 10:40 PM, Alan Ott a...@signal11.us wrote: Hello, I'm using PagedLOD to load terrain tiles off disk. The problem I have is that before I want the tile to actually render, I want to do a setup of the tile (to look up certain control nodes and set switches according to the current state of the system (eg: day/night mode, etc)). So on my own update(), I check to see if each PagedLOD has just loaded, and if it has, I run the initialization on it. The problem is, when a tile gets loaded, it is rendered for one frame _before_ I can do my initialization on it. So for one frame, it is drawn wrong, then the next frame, it is drawn right. I thought I might be able to get around this by setting the Node Mask to 0 until it was initialized, but that seems to just keep the tiles from getting loaded entirely (because the update traverser isn't getting into the PagedLOD either). Do any of you have any ideas of what I could try to do to get around this? Is there some value of the NodeMask that I could use to enable update but not draw? Such a value did not seem to be documented in the API. Thanks for all your help, Alan. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] frustum culling in shader
Hi again!
Sébastien, I'm afraid I cannot use the transform you're suggesting: in fact
I should not rely at all on the camera position, because the cam position
may also depends on moving objects in my scene and the cam position is
updated during the event traversal.
So I would update the position with the current cam pos,
Then update the cam pos with another objet position
and then render the scene
== This leads to improper rendering (specially when your targeted objects
are moving very fast) [and I'm rendering a solar system where I use meters
as the base unit :-)]
regards,
Manu.
2009/4/29 Jean-Sébastien Guay jean-sebastien.g...@cm-labs.com
Hi Emmanuel,
I have an sphere object I want to use as a sky sphere. What's the best
wait to do that ???
There's been discussion over the last few days about ways to disable auto
near/far calculation and override the far plane setting for a skydome /
sphere. See this thread:
http://thread.gmane.org/gmane.comp.graphics.openscenegraph.user/43442
It's a little convoluted but I ended up with something that worked well.
The sphere itself you can do whatever way you want. I prefer to have a
large sphere that is in the scene (i.e. that doesn't move with the eye
point) but you may want it to move, in which case I think the easiest way is
to use a transform that places it in the right place automatically:
class MoveWithCameraTransform : public osg::Transform
{
public:
// Get the transformation matrix which moves from local coords to
world coords.
virtual bool computeLocalToWorldMatrix(osg::Matrix matrix,
osg::NodeVisitor* nv) const
{
osgUtil::CullVisitor* cv =
dynamic_castosgUtil::CullVisitor*(nv);
if (cv)
{
osg::Vec3 eyePointLocal = cv-getEyeLocal();
matrix.preMult(osg::Matrix::translate(eyePointLocal));
}
return true;
}
// Get the transformation matrix which moves from world coords to
local coords.
virtual bool computeWorldToLocalMatrix(osg::Matrix matrix,
osg::NodeVisitor* nv) const
{
osgUtil::CullVisitor* cv =
dynamic_castosgUtil::CullVisitor*(nv);
if (cv)
{
osg::Vec3 eyePointLocal = cv-getEyeLocal();
matrix.postMult(osg::Matrix::translate(-eyePointLocal));
}
return true;
}
};
If you use this, you don't need to muck around with the auto near/far
calculation like I did. You can use a sphere of very small size and use an
osg::Depth that sets fragments only at the far plane, rendering it after all
other opaque objects have been rendered (but before transparent ones so they
will be blended with the sky if needed):
// ss is the skydome's stateset.
// Transparent bin is #10 by default so render just before
// transparent objects.
ss-setRenderBinDetails(9, RenderBin);
ss-setAttributeAndModes(
new osg::Depth(osg::Depth::LEQUAL, 1.0, 1.0),
osg::StateAttribute::ON);
Hope this helps,
J-S
--
__
Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.webhop.org/
___
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
___
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] ViewDependentShadow and Lod
Hi Antonin, As far as I remember, ABSOLUTE_RF_INHERIT_VIEWPOINT reference frame for Shadow map camera is set in osgShadow::StandardShadowMap and should be inherited and used by all derived classes including DebugShadowMap, MinimalCull/DrawBounds and all three LispSM flavours. So it looks like your problems may be caused by something else... We have been using LispSM with LODs and we have not seen major artifacts since this addition of ABSOLUTE_RF_INHERIT_VIEWPOINT which happened after discussion you referenced. Maybe you are using LODs switched by pixel sizes (not viewpoint distance ) ? I have not tested this scenario but I would guess that it would depend on shadow map resolution. Its also possible that LispSM skewed projection matrix may somehow cause wrong results in pixel size LOD computations. Sorry to say that but you caught me at bad moment. I am going on a 5 day trip tomorrow and will be offline till next Tuesday. If you are unable to solve the issue by then, send some more info and maybe we would come up with some fresh idea... Cheers, Wojtek Lewandowski From: Antonin Linares Sent: Wednesday, April 29, 2009 5:57 PM To: osg osg Subject: [osg-users] ViewDependentShadow and Lod Hi all, I actualy use LightSpacePerspectiveShadowMap and it's work very well. but :( My terrain database lod levels became crazy, he seem to me it's the same problem in this thread here. (lod is compute from the shadow camera view point instead of eyes points) So i test to change the shadow camera RefernceFrame to ABSOLUTE_RF_INHERIT_VIEWPOINT in DebugShadowMap but it's made no change. Wojtek save me !! thanks all. Antonin Linares. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgEarth + OSG 2.8.0 + ATI card
hi ! I was running osgearth here but the texture arent so close like your pictures . How can I get the best textures ?? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgEarth + OSG 2.8.0 + ATI card
Hi Carlos Higher resolution imagery loads in as you zoom in closer to the ground. Are you any issues in particular? Jason On Apr 29, 2009, at 6:31 PM, Carlos Sanches ces...@gmail.com wrote: hi ! I was running osgearth here but the texture arent so close like your pictures . How can I get the best textures ?? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] how to specify GLSL attribute??
Hi, Im new to osg.I want to use an attribute float vertextemp; in my vertex shader.How to give that array to vertex shader. Thank you. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11071#11071 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] how to specify GLSL attribute??
To do what you want, use a Uniform. Try doing a case insensitive grep in the OSG source and examples for the word uniform for more info. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Brett Sent: Wednesday, April 29, 2009 5:09 PM To: osg-users@lists.openscenegraph.org Subject: [osg-users] how to specify GLSL attribute?? Hi, Im new to osg.I want to use an attribute float vertextemp; in my vertex shader.How to give that array to vertex shader. Thank you. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11071#11071 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] how to specify GLSL attribute??
Brett wrote: Hi, Im new to osg.I want to use an attribute float vertextemp; in my vertex shader.How to give that array to vertex shader. Assuming you have an osg::Geometry object called geometry, and an osg::Program called program, the following code should work: osg::FloatArray * attrib = new osg::FloatArray(); // (Fill attrib with per-vertex attributes) int attrNum = 1; geometry-setVertexAttribArray(attrNum, attrib); geometry-setVertexAttribBinding(attrNum, osg::Geometry::BIND_PER_VERTEX); program-addBindAttribLocation(vertextemp, attrNum); You can set attrNum to any vertex attribute location that's not currently in use. I'd avoid 0, 2, 3, or 8, because certain video drivers may still alias the generic vertex attributes with the traditional ones (vertex coordinates are at 0, normals at 2, colors at 3, texture coordinates at 8). --J ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] how to specify GLSL attribute??
Ah yes. Vertex attributes. My mistake, that's what I get for speed reading. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Jason Daly Sent: Wednesday, April 29, 2009 7:21 PM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] how to specify GLSL attribute?? Brett wrote: Hi, Im new to osg.I want to use an attribute float vertextemp; in my vertex shader.How to give that array to vertex shader. Assuming you have an osg::Geometry object called geometry, and an osg::Program called program, the following code should work: osg::FloatArray * attrib = new osg::FloatArray(); // (Fill attrib with per-vertex attributes) int attrNum = 1; geometry-setVertexAttribArray(attrNum, attrib); geometry-setVertexAttribBinding(attrNum, osg::Geometry::BIND_PER_VERTEX); program-addBindAttribLocation(vertextemp, attrNum); You can set attrNum to any vertex attribute location that's not currently in use. I'd avoid 0, 2, 3, or 8, because certain video drivers may still alias the generic vertex attributes with the traditional ones (vertex coordinates are at 0, normals at 2, colors at 3, texture coordinates at 8). --J ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
