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Culling

Eeny, meeny, miny, moe

Culling is when you try to reject objects that can not be seen as soon as possible. Objects in this case can be any amount of surfaces.

Frustum: What is visible inside your view.
Portals: Use 'doors' to find out if you can see things on the other side.
Potentially Visible Sets: Precalculate what is visible.
Occlusion Culling: Render things to learn if they are visible.
Hierarchical: If you can't see the boss the minions is invisible.

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