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camera frustrum delete question

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Im a bit stuck. There are serveral ways to delete everything outside the camera view,

like group by volume based on camera,
uv texture based on camera view.

But I cant figure out a way to use a method to send rays to all object facing the camera and delete everything thats has no first hit attribute.
e.g. I have a autocad model and I dont even want all the inside objects that are not visible for that shot.

Can someone lead me to some good starting point / hip / anything that can help?
Thnx in advance


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