Frustum Culling
From Xtreme3D
Frustum Culling
Frustum Culling | Selection of the pyramid of visibilityThe method of selection of the invisible geometry, used for large polygonal objects (for example, landscape or interior scene). Redrawn only those objects that are fully or partially located inside of the truncated pyramid visibility (view frustum). All that is outside the pyramid, located outside of the screen.