Apple inc. (20240404172). Ray-Box Intersection Circuitry

Ray-Box Intersection Circuitry

Organization Name

apple inc.

Inventor(s)

Christopher A. Burns of Austin TX (US)

Casper R. Van Benthem of Abbots Langley (GB)

Ray-Box Intersection Circuitry

This abstract first appeared for US patent application 20240404172 titled 'Ray-Box Intersection Circuitry

Original Abstract Submitted

techniques are disclosed relating to ray intersection tests for ray tracing in graphics processors. in some embodiments, a ray cache stores, transformed ray direction corresponding to a transform of a ray based on its dominant direction axis. ray intersect acceleration circuitry may determine whether a ray intersects a bounding volume of a bounding volume hierarchy (bvh) data structure. ray-plane test circuitry may perform a set of six ray-plane tests for the bounding volume using at most four floating-point multiplication operations by four multiplier circuits. the floating-point operations may operate on the transformed ray direction components from the ray cache circuitry and coordinate information for the bounding volume. disclosed techniques may reduce area and power consumption by avoiding multiplier circuitry for some ray-plane tests.