Null-pointer dereference

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In our multi-threaded application, we have a thread that renders osg, and 
another one that displays a GUI. That GUI changes ocean properties, such as 
refraction.

When enabling/disabling refraction, a null-pointer is dereferenced in 
OceanScene::ViewData::cull()

I do not know the exact sequence that causes this, but I simply added a check 
for null-pointers and the problem went away.

Here's a patch file of my modifications in OceanScene.cpp.

Any idea why this might happen?

Original issue reported on code.google.com by francis....@cm-labs.com on 13 Feb 2012 at 8:51

Attachments:

• OceanScene.cpp.patch