FrustumCulling

Frustum culling is a technique used in computer graphics to optimize rendering by discarding objects that are outside the viewer's field of view. The view frustum is a six-sided pyramid shape that defines the visible area of the scene. Objects that lie entirely outside this frustum are not rendered, saving significant processing time and improving performance.

The frustum is typically defined by the camera's position, orientation, and projection parameters, such as the field of view, aspect ratio, and near and far clipping planes. To determine if an object is inside or outside the frustum, its bounding volume, often an axis-aligned bounding box (AABB) or a sphere, is checked against the frustum's planes. If the bounding volume does not intersect any of the frustum's planes, it is considered outside and can be culled.

This method is particularly effective in large or complex scenes where many objects may be outside the camera's view at any given time. By avoiding the rendering of these invisible objects, applications can achieve higher frame rates and a smoother visual experience. Frustum culling is a fundamental optimization technique implemented in most modern 3D rendering engines.