Hi all,
I need to get occlusion query result from a render to an FBOViewport using
a shader attached to a polygonForeground (in other words i need to get the
number of "discard" in the fragment shader). In OpenGL i can do it but i
am looking for a simple way to realize it in OpenSG. I know how to run
custom OpenGL code in a renderAction but in the same action i should run
also default render action (for rendering fboviewport). Example:
...
fbo->render(customRenderAction);
....
the customRenderAction is registered as follow:
enterRenderAction(..){
beginOcclusionQuery in OPENGL
run default render enter action for fbo rendering ???
}
leaveRenderAction(..){
run default render leaving action for fbo rendering ???
endOcclusionQuery in OPNEGL
get occlusionQueryResult
}
This kind of solution is possible? If yes, how can I render defaul action?
Does the OcclusionCulling could help me?
Thank you in advance!
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