[osg-users] virtual ~TemplateArray() is protected
Hi, I gave myself a headache today chasing bugs because I had a class which had an osg::ref_ptr as a (private) member. gcc threw compile errors referring to the destructor for osg::TemplateArray being protected, which it claimed was being called by my class's (empty) destructor. My class did not inherit any OSG classes. Have I made a dumb mistake, stumbled upon something unintended, or what? I am using OSG 3.0.1. Thank you kindly for setting me straight, stathibus -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=60602#60602 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] crashing with paged LODs, line intersector on computeBound
Hi, I wonder if anyone can offer some insight on why I may be experiencing these random crashes. Essentially I have many line intersection visitors following a node which is moving through the scene and performing line intersections on terrain, which is a pagedLOD database of proxynodes. This is done in a multithreaded fashion, i.e. there are many threads each with a lineSegmentIntersector and intersectionVisitor of its own. By and large, it works great, but on very rare and seemingly random occasions the application crashes with a segmentation fault. It traces to the accept call, where I am calling the terrain's group node's accept function on an intersection visitor. A human-friendly version of the backtrace is as follows: Code: osg::Group::computeBound at Group.cpp osg::LOD::computeBound at LOD.cpp getBound at Node.cpp isCullingActive at Node.cpp enter at LineSegmentIntersector.cpp enter at IntersectionVisitor.cpp accept at Group.cpp traverse at Group.cpp apply at IntersectionVisitor.cpp accept at Group.cpp The code that performs the actual intersection looks like this: Code: lineSegmentIntersector->setStart(start); lineSegmentIntersector->setEnd(end); intersectionVisitor->reset(); root->accept(*intersectionVisitor); It's possible I am doing something evil with this multithreading setup that I am unaware of (please tell me!), but since everything works 99.9% of the time, I suspect there is something more subtle going on. I am running OSG 3.0.1 in C++. Thanks, Stathibus -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=54021#54021 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Dynamic / incremental mesh generation or triangulation
Hi, I'm writing an application to render a mesh generated from a stream of 3d points, so that the mesh is updated in realtime to include points as they are added. It doesn't necessarily need to be a delaunay triangulation, but that seemed like a reasonable place to start. The osg::DelaunayTriangulator makes a nice mesh but it does not seem to be built for dynamic updating. Does anyone have a suggestion on how to attack this? I know the bounds of the mesh and the points will be randomly distributed within those bounds. Ultimately I am also going to need the ability to color sections of the mesh. Thanks! S -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=52790#52790 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] copying contents of osg::Group to rendered Group
Hi all. I have two osg::Groups, one which is being rendered in my viewer and another which is used as a buffer that collects geodes as they are created. Periodically, I want to flush the contents of my root group and copy over all the contents in the buffer. I have tried several methods of copying the contents of the buffer group to the root group, but I never actually see the new contents appear in my view. Specifically I have tried looping over all children in the buffer and calling root->addChild on each of these. I have also tried assigning the root to a deep copy clone of the buffer. In both cases I can verify that the root contains the data in the buffer using getNumChildren(), but they never show up. Does anyone know why this would be? Or, am I just going about this the wrong way? Thanks, S -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=50678#50678 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] getting RGB of texture in *.ive file
Thanks for the advice!
I'm getting closer but not quite there yet.
I found that my drawable in this test case has exactly one parent, and his
parent has a state set. I am able to get the image attached to the texture on
this state set without running across any null pointers, and write the image to
a file for verification...
Code:
if(drawable->getParent(0)->getStateSet())
{
state_set = drawable->getParent(0)->getStateSet();
osg::Texture * texture = state_set->getTextureAttribute(0,
osg::StateAttribute::TEXTURE)->asTexture();
if(texture->getImage(osg::Material::FRONT))
{
textureImage = texture->getImage(osg::Material::FRONT);
osgDB::writeImageFile(*textureImage, "image.bmp");
}
Unfortunately, the image produced is pure noise. Also, I've found that using
the getColor method on the image always returns a Vec4 with values (1, 1, 1,
1)... so something is clearly wrong.
I should have no problem accessing the textures of an *.ive file directly in
this way, right?
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[osg-users] getting RGB of texture in *.ive file
Hello,
I have a large terrain map which I load from an *.osg file containing a list of
ProxyNode objects containing *.ive files, using osgDB::readNodeFile.
My end goal is to get RGB of points on the texture map found through a line
segment intersection.
I have read through the mousePosition function in the InteractiveImageHandler
class which shows how I would get the texture coordinates of the point
intersected.
>From there, I attempted to get the RGB value this way:
Code:
osg::Drawable * drawable = intersection.drawable.get();
if(drawable->getStateSet())
{
state_set = drawable->getStateSet();
osg::Texture * texture =
dynamic_cast(state_set->getTextureAttribute
(0, osg::StateAttribute::TEXTURE));
if(texture)
{
textureImage = texture->getImage(osg::Material::FRONT);
return textureImage->getColor(textureCoordinates);
}
}
This snippet produces a valid drawable, however the drawable returns a NULL
stateset and so I can't obtain the texture object.
How can I obtain the osg::Image to get RGB in this case? Or, is there a better
method?
Thanks-
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Re: [osg-users] instanced drawing of dynamic objects
Thanks so much. I will have a look at those examples. I don't need rotation capabilities, only translation, scale, and color as you said. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=49071#49071 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] instanced drawing of dynamic objects
Hi, I have a scientific visualization application in which I essentially want to render many (hundreds of thousands) of cubes at once, of varying color and size. Furthermore, these cubes will change position and color every few seconds, and I need to position them deliberately. Right now I am simply drawing osg::Box objects where I want them, and flushing the root group / reallocating from scratch on each iteration. This is a dumb approach and I'm looking for something more efficient. I am not intimately familiar with openGL but it seems that instanced drawing might be a good fit for this problem. I've looked at the osgdrawinstanced example but I'm confused about how I can define the shader such that I can specify the transformation on a per-instance basis. Does anyone have a suggestion on how I could go about this, or other suggestions for an optimal solution? Chris -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=49060#49060 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] osgQt widget + trackball manipulator only half working
I took another look through the osgviewerQt source and found a solution, though I'm not sure I understand why my extra step is necessary: Manually initializing the projection matrix for the camera using setProjectionMatrixAsPerspective fixes things. Code: camera->setProjectionMatrixAsPerspective(30.0f, static_cast(traits->width)/static_cast(traits->height), 1.0f, 1.0f ); -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=48436#48436 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] osgQt widget + trackball manipulator only half working
Yes, oddly enough it works just fine. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=48435#48435 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] [osgPlugins] osgQt widget + trackball manipulator only half working
Hi All,
I have a simple Qt4 wrapper for my OSG 3.0 application which employs the
trackball manipulator. The left and middle mouse button functions in the
manipulator work as expected, but the right mouse button does not seem to do
anything, which makes the manipulator kind of useless.
Is this a known issue or could there be some problem with the way that I'm
implementing my viewer?
My widget class (which inherits osg::CompositeViewer) adds a view with the
trackball manipulator like so:
Code:
QWidget * MyViewerWidget::addToViewWidget(osg::Camera* cam, osg::Group* root)
{
osgViewer::View* view = new osgViewer::View;
view->setCamera(cam);
addView(view);
view->setSceneData(root);
view->setCameraManipulator(new osgGA::TrackballManipulator);
osgQt::GraphicsWindowQt* gw =
dynamic_cast(cam->getGraphicsContext());
return gw ? gw->getGLWidget() : NULL;
}
And in the constructor for my Qt main window I initialize an object of this
class called viewWidget and do:
Code:
osg::Camera * cam1 = viewWidget->createCamera(0,0,100,100);
QWidget * view1 = viewWidget->addToViewWidget(cam1, root);
setGeometry(100,100,800,600);
grid->addWidget(view1, 0, 0);
viewWidget->setLayout(grid);
setCentralWidget(viewWidget);
I am running all of this on linux (Fedora 15).
Thanks for any input!
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