[osg-users] OcclusionQueryNode iOS Crash

[Alessandro Terenzi]

Hi,
I'm trying to use the OcclusionQueryNode to check if a model (loaded from a file) is visible or not, but as soon as the app starts I get some warnings:


Code:
Warning: detected OpenGL error 'invalid enumerant' at Before Renderer::compile
Warning: PolygonMode::apply(State&) - is not supported.
Warning: PolygonMode::apply(State&) - is not supported.
Warning: detected OpenGL error 'invalid operation' at after RenderBin::draw(..)



the first frame is actually drawn (and the loaded model is also displayed correctly) but the app crashes with this message: 


Code:
error: memory read failed for 0x0



I'm using OSG 3.4.0 on iOS (8.4.1). Built with OpenGLES 1.0 support. FYI, I'm just adding the OcclusionQueryNode to a group and then I add a subgraph (where there's the loaded model) to the OcclusionQueryNode itself. Moreover regardless if I enable or not the occlusion node (by means of setQueriesEnabled(bool)) the app crashes in any case.

Do you know if OcclusionQueryNode has some problems on iOS? Any suggestion?

Thank you.
Alessandro

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=65162#65162