Re: [osg-users] 139.com Spam
I have the same problem. On Jun 8, 2012, at 12:29 AM, Preet wrote: me three... gmail does a decent job of filtering it out once you mark it as spam though On Thu, Jun 7, 2012 at 4:49 PM, Jordi Torres jtorresfa...@gmail.com wrote: Me too. El 07/06/2012 21:43, rocco martino martinoro...@gmail.com escribió: Idem 2012/6/7 Kim Bale kcb...@googlemail.com Is anyone else getting these Chinese emails quoting the subject of a post made to osg-users? I've had a few now and I have no idea where they're coming from. K. ___ 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] Set Viewport background color as transparent
Hi Vishwa,
the only way I can help you is giving you my code of initialization:
Try to adapt it for non your platform.
variables of instance:
osg::ref_ptrosgViewer::Viewer _viewer;
osg::ref_ptrosg::MatrixTransform _root;
- (osg::ref_ptrosg::GraphicsContext)createGraphicContext
{
//create our graphics context directly so we can pass our own window
osg::ref_ptrosg::GraphicsContext::Traits traits = new
osg::GraphicsContext::Traits;
// probably you need to change this because it is for iOS
osg::ref_ptrosg::Referenced windata = new
osgViewer::GraphicsWindowIOS::WindowData(self.view,
osgViewer::GraphicsWindowIOS::WindowData::IGNORE_ORIENTATION);
// Setup the traits parameters
traits-x = 0;
traits-y = 0;
traits-width = //put here the width of the window view
traits-height = //put here the height of the window view
traits-depth = 24; //keep memory down, you can put 16
traits-windowDecoration = false;
traits-alpha = 1;
traits-doubleBuffer = true;
traits-sharedContext = 0;
traits-setInheritedWindowPixelFormat = true;
//traits-windowName = osgViewer;
traits-inheritedWindowData = windata;
// Create the Graphics Context
osg::ref_ptrosg::GraphicsContext graphicsContext =
osg::GraphicsContext::createGraphicsContext(traits.get());
osg::setNotifyLevel(osg::INFO);
return graphicsContext;
}
This is the function that initialize everything:
//here I call the function I previously defined to create graphics context
osg::ref_ptrosg::GraphicsContext graphicsContext = [self
createGraphicContext];
//create the viewer
_viewer = new osgViewer::Viewer();
//if the context was created correctly then attach to our viewer
if(graphicsContext)
{
//suppress annoying opengl warnings //attention please, you can comment
the lines to debug
graphicsContext-getState()-setCheckForGLErrors(osg::State::NEVER_CHECK_GL_ERRORS);
_viewer-getCamera()-setGraphicsContext(graphicsContext);
_viewer-getCamera()-setViewport(new osg::Viewport(0, 0,
graphicsContext-getTraits()-width, graphicsContext-getTraits()-height));
}
else
{
std::cout ERROR: I can't create graphic context std::endl;
}
//create root of the scenegraph tree
_root = new osg::MatrixTransform();
//what I do here is simply create new nodes representing what i want to
draw and add them as child of _root
[self initModels];
//YOU PROBABLY DON'T NEED TO DO THIS part about shaders
std::cout initing shaders std::endl;
//initialize the shaders and attach them to _root
[self initShaders];
std::cout setting scene data to root std::endl;
//create scene and attach it to _viewer
_viewer-setSceneData(_root.get());
//Set the threading model for the viewer,
//Possible options are: SingleThreaded || DrawThreadPerContext
_viewer-setThreadingModel(osgViewer::Viewer::SingleThreaded);
std::cout setup camera std::endl;
//I setup the camera parameters such as clear color, clear mask, render
order ...
[self setupCamera];
_viewer-frame();
Then you call back _viewer-frame in a way I think you know.
The function [self setupCamera] is this:
- (void)setupCamera
{
//set the clear color of the camera to be semitransparent
_viewer-getCamera()-setClearColor(osg::Vec4(0.0f, 0.0f, 0.0f, 0.75f));
//set the clear mask for the camera
_viewer-getCamera()-setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
_viewer-getCamera()-setRenderOrder(osg::CameraNode::PRE_RENDER);
_viewer-getCamera()-setComputeNearFarMode(osgUtil::CullVisitor::DO_NOT_COMPUTE_NEAR_FAR);
}
I personally tried the semi-transparency (with that value of 0.75) and it is
working.
I hope this helps.
Just remember to attach a Camera manipulator or manually set ViewMatrix and
ProjectionMatrix
Cheers,
John
On Jun 6, 2012, at 10:58 AM, Robert Osfield wrote:
Hi Vishwa,
On 6 June 2012 05:46, shekhar vishwa vishwa.shek...@gmail.com wrote:
I am trying to implement the multiple views in same window. Each view render
the diffrent models.User can set the view position at run time by mouse
dragging. If dragged view is overlapped with any view then dragged view
backgroud should be semi-trasparent.
Please suggest me to resolve this.
When you say background of the view being moved do you simply mean the
clear colour that provides the normal background colour of a viewport
needs to be disabled? This is an important point as there isn't
really any concept of background in OpenGL or the OSG. Also be
specific about what you mean by semi-transparent. I'm guessing that
you want to see the underlying views being the viewport, but what
blending do you intend between the view at the front and the back?
Robert.
___
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Re: [osg-users] Set Viewport background color as transparent
I thin you can try to set the clear mask alpha channel to a value of 0.5 cheers, John On Jun 4, 2012, at 9:49 PM, shekhar vishwa vishwa.shek...@gmail.com wrote: Hi, Thanks for help. Now I can make the camera background as transparent. What parameters need to set the camera background as semi-transparent. Please help me. Thanks Vishwa ___ 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] Set Viewport background color as transparent
I think Vishwa wants to do something similar to what I am currently doing in iOS. I set transparent background in order to see some layer that is below, which in my case is the image coming from the videocamera. Anyway it would be helpful if Vishwa you can explain us better the purpose of your application and the platform where you are running. Cheers, John On Jun 5, 2012, at 12:01 PM, Robert Osfield robert.osfi...@gmail.com wrote: Hi Vishwa, You still don't explain what you mean by a semi-transparent background colour, given what replies you've already had and you've tried it suggest to me that you really are talking about something different as what you are asking really doesn't make sense in an normal graphics application. In a normal graphics application objects can be drawn semi-transparent on top of the background, and multiple Camera's can be layered on top of each one can have the front Camera's disable the clear of the colour buffer so they are rendered on top (see osghud), one can even set the an RGBA colour buffer when doing render to texture as this can be of use when reusing the texture to do appropriate blending. However it really doesn't seem like you are asking to do any of these scenario's, or perhaps you are. The only way I can make sense of what you are asking is that perhaps you might be wanting to render window that is transparent so you can see the desktop below it. Is this correct? Robert. On 5 June 2012 05:01, shekhar vishwa vishwa.shek...@gmail.com wrote: Hi, I want to show the models on semi-transparent backgroud color. I have implemented following code camera1-setViewport( 0, 0, 200, 200 ); camera1-setClearColor( osg::Vec4(0.0f, 1.0f, 1.0f, 0.5f) ); camera1-setRenderOrder( osg::Camera::POST_RENDER ); camera1-setAllowEventFocus( true ); camera1-setClearMask(GL_DEPTH_BUFFER_BIT ); //| GL_DEPTH_BUFFER_BIT camera1-setReferenceFrame( osg::Transform::ABSOLUTE_RF ); But above code is set the background as complete transparent. Please help me to make the camera background as semi-transparent. Thanks Vishwa ___ 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] Set Viewport background color as transparent
Hi Shekhar, to set a transparent background you have to enable alpha when you set your traits When you set the graphic context traits osg::ref_ptrosg::GraphicsContext::Traits traits = new osg::GraphicsContext::Traits; you can just add the line to your configuration: traits-alpha = 1; after you create a graphiccontext and associate your traits osg::ref_ptrosg::GraphicsContext graphicsContext = osg::GraphicsContext::createGraphicsContext(traits.get()); you can set it in your camera like this _viewer = new osgViewer::Viewer(); _viewer-getCamera()-setGraphicsContext(graphicsContext); On Jun 4, 2012, at 8:21 AM, shekhar vishwa wrote: Hi, I am trying to implement the 3D overlay above current view. I am trying to set the camera background color as transparent. I am using following code. osg::Node* node= osgDB::readNodeFile( Models/cessna.osg); osg::Camera* camera = new osg::Camera; camera-setViewport( 0, 0, 200, 200 ); camera-setClearColor(osg::Vec4(1.0f,1.0,0.8f,0.2f)); osg::StateSet* stateset = camera1-getOrCreateStateSet(); stateset-setMode(GL_BLEND,osg::StateAttribute::ON); stateset-setRenderingHint(osg::StateSet::TRANSPARENT_BIN); camera-setStateSet(stateset); camera-setRenderOrder( osg::Camera::POST_RENDER ); camera-setAllowEventFocus( true ); camera-setClearMask( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); camera-setReferenceFrame( osg::Transform::ABSOLUTE_RF ); camera-addChild( node1 ); Above code only set the white background. Please help to set the camera backgroud color as transparent. Thanks Vishwa -- Forwarded message -- From: shekhar vishwa vishwa.shek...@gmail.com Date: Sat, Jun 2, 2012 at 5:00 PM Subject: Set Viewport background color as transparent To: osg-users@lists.openscenegraph.org Hi, I am using the OSG, but I unable to set the viewport or view backgraund color as transparent. Please help me to resolve this issue. Thanks Vishwa ___ 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] accessing data structures of objects
Hi, When you load data from a file like an obj using the function osgDB::readNodeFile is there any way to access the arrays containing vertex coordinates, normal coordinates and texture coordinates associated to the object? I want to design a way to detect which rendered object user is touching in the screen. Thank you, John ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Improving performance of OBJ rendering by back face culling
Thank you for your precious advice Robert. Cheers, John On May 30, 2012, at 10:23 AM, Robert Osfield wrote: Hi John, On 30 May 2012 00:16, Gio kahar...@gmail.com wrote: So... your suggestion is to optimize the 3d model reducing the number of vertices because face culling will not improve performance? Can you argue more about why is like that? Paul explained... if you are fill limited then back face culling can help, if not then it make little difference. Fill limited is when the GPU has saturated it's ability to deliver pixels to the frame buffer. One way to find out whether you are fill limited or not is to change the size of the window you are rendering to so that it's smaller, if performance goes up then you are fill limited. There are many potential bottlenecks that can occur when doing graphics, fill limit is only one of them. Paul suggestion of being vertex limited is one of them. The way to test this is to render a series of models with increase number of vertices by a constant fill load and constant number of objects. You can use the osgsimplifer example to illustrate how to cut the number of vertices down on a model. As for the many other different types of bottlenecks, well there is are simply too many to expand upon in my message, but the topic of optimization has been covered many times on the mailing list/forum, and plenty of books and online resources on optimization of graphics. It's a huge topic, I'm twenty years into my exposure to computer graphics and am still learning new things. It's a topic that you should be prepared to invest time and energy into. 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
[osg-users] Improving performance of OBJ rendering by back face culling
Hello, I am developing an application for iphone and ipod touch using openscenegraph. It is an augmented reality application and I have to load a very complex model. The original 3d model has 5 million vertices. Since I am using a mobile platform which is limited in computational power I simplified the model using 3d studio max. I reduced the size of the model from 500Mb to 4.2 Mb using proOptimizer. The model now has in total about 36,000 vertices and about 53,000 faces. I am able to render it but frame rate is slow. I'd like to improve performance using back face culling. The point is I don't know how to activate it (if it is possible): I tried with these lines of code but frame rate is still low: [code] osg::StateSet* ss = _root-getOrCreateStateSet(); osg::CullFace* cf = new osg::CullFace(osg::CullFace::BACK ); ss-setAttribute( cf ); [/code] I am using OpenGL ES 2.0 and shaders. I setup the camera in this way: [code] //set the clear color of the camera to be transparent _viewer-getCamera()-setClearColor(osg::Vec4(0.0f, 0.0f, 0.0f, 0.0f)); //set the clear mask for the camera _viewer-getCamera()-setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); _viewer-getCamera()-setRenderOrder(osg::CameraNode::PRE_RENDER); _viewer-getCamera()-setComputeNearFarMode(osgUtil::CullVisitor::DO_NOT_COMPUTE_NEAR_FAR); [/code] I use DO_NOT_COMPUTE_NEAR_FAR because I need to set manually projection and viewMatrix at every drawing cycle. I also initially set viewport like this: [code] _viewer-getCamera()-setViewport(new osg::Viewport(0, 0, graphicsContext-getTraits()-width, graphicsContext-getTraits()-height)); [/code] The hierarchy of my object is structured as: _root is a osg::MatrixTransform my 3d model is divided in subparts. all the subparts of my 3d model are direct child of _root and are of type osg::Node I hope you can give me some tips to improve performance. If you need some other information about my setup I will be glad to give it. Thank you. Greetings, John Moore ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Improving performance of OBJ rendering by back face culling
So... your suggestion is to optimize the 3d model reducing the number of vertices because face culling will not improve performance? Can you argue more about why is like that? Thank you. John On May 29, 2012, at 11:26 PM, Paul Martz wrote: Enabling face culling will improve performance only when rendering is fill-limited. If you're vertex-limited, face culling will not affect performance. -Paul On 5/29/2012 2:48 PM, Gio wrote: Hello, I am developing an application for iphone and ipod touch using openscenegraph. It is an augmented reality application and I have to load a very complex model. The original 3d model has 5 million vertices. Since I am using a mobile platform which is limited in computational power I simplified the model using 3d studio max. I reduced the size of the model from 500Mb to 4.2 Mb using proOptimizer. The model now has in total about 36,000 vertices and about 53,000 faces. I am able to render it but frame rate is slow. I'd like to improve performance using back face culling. The point is I don't know how to activate it (if it is possible): I tried with these lines of code but frame rate is still low: [code] osg::StateSet* ss = _root-getOrCreateStateSet(); osg::CullFace* cf = new osg::CullFace(osg::CullFace::BACK ); ss-setAttribute( cf ); [/code] I am using OpenGL ES 2.0 and shaders. I setup the camera in this way: [code] //set the clear color of the camera to be transparent _viewer-getCamera()-setClearColor(osg::Vec4(0.0f, 0.0f, 0.0f, 0.0f)); //set the clear mask for the camera _viewer-getCamera()-setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); _viewer-getCamera()-setRenderOrder(osg::CameraNode::PRE_RENDER); _viewer-getCamera()-setComputeNearFarMode(osgUtil::CullVisitor::DO_NOT_COMPUTE_NEAR_FAR); [/code] I use DO_NOT_COMPUTE_NEAR_FAR because I need to set manually projection and viewMatrix at every drawing cycle. I also initially set viewport like this: [code] _viewer-getCamera()-setViewport(new osg::Viewport(0, 0, graphicsContext-getTraits()-width, graphicsContext-getTraits()-height)); [/code] The hierarchy of my object is structured as: _root is a osg::MatrixTransform my 3d model is divided in subparts. all the subparts of my 3d model are direct child of _root and are of type osg::Node I hope you can give me some tips to improve performance. If you need some other information about my setup I will be glad to give it. Thank you. Greetings, John Moore ___ 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
