intersects a line (through points p and q, against a triangle a, b, c - mostly taken from Real Time Collision Detection - p186

intersection routines

mostly taken from Real Time Collision Detection - p192

mostly taken from Real Time Collision Detection - p192

component wise min max functions

ensures that the normal component of the plane is unit magnitude

returns 0xFFFFFFFF if the predicate is true for ALL threads in the warp, returns 0 otherwise

returns 0xFFFFFFFF if the predicate is true for any thread in the warp, returns 0 otherwise

returns a mask of all threads in the warp with bits set for threads that have predicate true