Frustum Culling

Frustum Culling

FrustumIntersection extracts 6 frustum planes from a projection-view matrix and tests AABBs, spheres, and points against them.

Construction

// OpenGL clip space (z=[-1,1]) — default
FrustumIntersection frustum = new FrustumIntersection();

// Vulkan clip space (z=[0,1])
FrustumIntersection frustum = new FrustumIntersection(true);
Update
frustum.set(projectionViewMatrix);   // pass Matrix4f
Tests
// AABB test — returns INSIDE, INTERSECT, or OUTSIDE
FrustumIntersection.Intersection result = frustum.intersects(aabb);

// Sphere test — returns same enum
FrustumIntersection.Intersection result = frustum.intersects(sphere);

// Point test — returns boolean
boolean visible = frustum.intersects(point);
Access Planes
Plane p = frustum.plane(0);  // left, right, bottom,