hb3p8

ivec4 ObjectNearestHit (in int theBVHOffset, in int theVrtOffset, in int theTrgOffset,
  in SRay theRay, in vec3 theInverse, inout SIntersect theHit, in int theSentinel)
{
  int aHead = theSentinel; // stack pointer
  int aNode = 0;           // node to visit

  ivec4 aTriIndex = INALID_HIT;

  float aTimeOut;
  float aTimeLft;

hb3p8

pushedT = (aTimeLft < aTimeRgh) ? aTimeRgh : aTimeLft;

...

int aStackOffset = theHit.Time < pushedT ? 2 : 1;

if (aHead - aStackOffset + 1 <= theSentinel)
  return aTriIndex;

aNode = Stack[aHead - aStackOffset + 1];