Module frustum 

Backend-agnostic frustum culling.

Given a column-major view-projection matrix the six clip-space planes are extracted using the Gribb-Hartmann method (left/right/bottom/top/near/far). Frustum::intersects_aabb returns false only when an axis-aligned bounding box is fully outside at least one plane. False positives are acceptable for culling (a few extra draws), false negatives are not, so the test treats the box as visible whenever it overlaps any plane.

Structs

Frustum

The six clip-space planes of a view frustum.

Plane

One frustum plane in clip space.

Functions

aabb_distance_sq

Squared distance from cam to the closest point on the AABB. Returns 0 if cam is inside.

transform_aabb

Compute the world-space AABB enclosing a local-space AABB transformed by a column-major model matrix. All eight corners are transformed and min/max’d component-wise.