Built in Occlusion ...

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Does anyone know what kind of built in occlusion or scene management blitz basic has internally ?

The reason I am asking is because I am a speed optimization freak . My initial guess is that it uses a simple scene heirarchy check to see if an entity is in the FOV, then surfaces etc.. But i'm still not sure, I would like to do my own optimizations but I do not want to do the same functions that blitz is doing internally for scene management.

Thanks