[osg-users] Camera render order and Threading models

[Riccardo Corsi]

Hi Robert,

I've tried to reproduce the issue with a minimal example, without success
so far, even though the essential bits should be the same.
I'm also thinking it might have something to do with the data variance of
the affected geometries, I'll double check.
If I find something I'll report back here,
Thanks,
Riccardo



*Riccardo Corsi*  co-founder, software engineering
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On Thu, Jan 7, 2021 at 6:45 PM Robert Osfield <robert.osfield at gmail.com>
wrote:

> Hi Ricard,
>
> Both the RTT Camera and the main Camera should both be traversed in the
> cull traversal within the same frame and accumulated modelview matrices
> cached in the rendering backend to sent to the GPU as part of the draw
> traversal together.  Ordinarily this system should prevent problems like
> your describe as the rendering backend is double buffered so that the cull
> writes to the currently recording frames rendering backend, while the draw
> traverses the previous rendering backend structures.
>
> The behaviour you describe makes it seem like some state is being modified
> across the frames, I don't have your app or data so can't say what this
> might be.  The best I can suggest is to investigate what state seems to be
> changed inappropriately.  It might be that you need to double buffer the
> state that is being updated whilst it's being used for rendering.
>
> Robert
>
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