Hi, I found the cause of the problem myself. When the scene graph is traversed a osgUtil::RenderStage is created for the camera and added to the RenderCache of the camera. So only one RenderStage per CullVisitor is created. When the RenderStage is drawn it sets a flag that is was already drawn this frame. So no matter how often you add a camere to the scene graph, it's scene is only rendered once. This optimization makes sence in most cases, but in my special case it would be great if I could turn it off.
I currently have two solutions for this problem: 1. A PostDrawCallback that resets the RenderStage flag by accessing the RenderCache of the current camera. This solution is extremly ugly. I had to copy the interal osg class osgUtil::RenderingCache because it is in no header file. A very bad hack: If the code of this class changes or the compiler creates a different memory layout(different optimizations turned on etc.) the dynamic_cast from osg::Object to osgUtil::RenderingCache can go terribly wrong. 2. Create a shallow copy of the virtual texturing scene graph. The root node and pre render camera is copied while the subgraph with the geometry is reused. The pre render pass with its callbacks will be called per depth peeling pass as expected and the waste of memory is not that big. I will implement the second solution because the first one is obviously not the way to go if I don't want to run in stability issues. Thank you! Cheers, Marcel ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=54109#54109 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
