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Determining what lights are in view.

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Well if you need to cull lights that are in the view you can just use frustum culling, lights are simply points. Just google for a frustum culling tutorial.

If you need to determine which lights affect your viewing area you can build the frustum pyramid and test which lights are under a certain distance from it. Instead of taking the pyramid you could approximate the world with bounding boxes or spheres.

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