[osg-users] Camera render order and Threading models

[Riccardo Corsi]

Hi all,

I'm facing an issue when using multiple cameras and different threading
models.
In my scene I have a slave camera which renders to a texture (using FBO +
texture attachment) in PRE_RENDER order; the texture is then attached to a
geometry which in turns is rendered by the main viewer camera.
I have verified that both cameras' view matrices are updated consistently
during the same frame update traversal (as they are linked one another).

When I run this setup with SingleThreaded model, everything works as
expected.

If I run it with DrawThreadPerContext (default on Windows), there is a
one-frame delay of the RTT camera result, meaning that during frame N the
main camera sees the render result of frame N-1 in the FBO camera texture
attachment.

I don't think this is an expected behavior.
Is there a way to fix the issue without switching to SingleThreaded mode?

Thank you,
Riccardo

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