> Hello,
> I would like to make a prerender camera that loop over the rendering of
its
> son's geometries until an event happens and then display the result as a
> texture with the main camera..
>
> mainloop(){
> while(condition){
> tex=prerender_camera.draw() //render to texture using fbo
> }
> maincamera.draw() //render the main scene using texture tex
> }
>
> (The condition depends on the post draw opengl state : an occlusion
> query.. )
> I have try a few tricks without success
here's my code:
//Setup prerendercamera
// clearing
_Camera->setClearMask(GL_DEPTH_BUFFER_BIT);
// projection and view
_Camera->setProjectionMatrix(osg::Matrix::ortho2D(0,1,0,1));
_Camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
_Camera->setViewMatrix(osg::Matrix::identity());
// viewport
_Camera->setViewport(0, 0, _TextureWidth, _TextureHeight);
_Camera->setRenderOrder(osg::Camera::PRE_RENDER);
_Camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
_Camera->attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER),
_OutTexture.get());
_camera->addchild(prerenderscene); //prerenderscene is a occlusion query
node
//mainscene has a state set that use OutTexture
mainscene->addChild(_Camera);
I would like:
1) to draw Scene from _Camera
2)test number of fragment drawn with an occlusionquery
3)test my condition and loop to 1) if it's wrong
4)if true draw mainscene using resulting OutTexture
> Can you help me for this?.
May I use a recursive Renderstage a postDrawCallback
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