traverse opt

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;
  float aTimeRgh;

      ivec3 mmax = ivec3 (theRay.Direct.x > 0.f ? 1 : 0,
                          theRay.Direct.y > 0.f ? 1 : 0,
                          theRay.Direct.z > 0.f ? 1 : 0);
                         
      ivec3 mmin = ivec3 (theRay.Direct.x <= 0.f ? 1 : 0,
                          theRay.Direct.y <= 0.f ? 1 : 0,
                          theRay.Direct.z <= 0.f ? 1 : 0);

  while (true)
  {
    ivec3 aData = texelFetch (uObjectNodeInfoTexture, aNode + theBVHOffset).xyz;

    if (aData.x == 0) // if inner node
    {
      vec3 aNodeMinLft = texelFetch (uObjectMinPointTexture, aData.y + theBVHOffset).xyz;
      vec3 aNodeMaxLft = texelFetch (uObjectMaxPointTexture, aData.y + theBVHOffset).xyz;
      vec3 aNodeMinRgh = texelFetch (uObjectMinPointTexture, aData.z + theBVHOffset).xyz;
      vec3 aNodeMaxRgh = texelFetch (uObjectMaxPointTexture, aData.z + theBVHOffset).xyz;

      mat2x3 aTimes = mat2x3 ((aNodeMinLft - theRay.Origin) * theInverse,
                              (aNodeMaxLft - theRay.Origin) * theInverse);
     
      aTimeOut = min ( aTimes[mmax[0]].x, min (aTimes[mmax[1]].y, aTimes[mmax[2]].z) );
      aTimeLft = max ( aTimes[mmin[0]].x, max (aTimes[mmin[1]].y, aTimes[mmin[2]].z) );

      int aHitLft = int(aTimeLft <= aTimeOut) & int(aTimeOut >= 0.f) & int(aTimeLft <= theHit.Time);
      
      aTimes = mat2x3 ((aNodeMinRgh - theRay.Origin) * theInverse,

      aTimeOut = min ( aTimes[mmax[0]].x, min (aTimes[mmax[1]].y, aTimes[mmax[2]].z) );
      aTimeLft = max ( aTimes[mmin[0]].x, max (aTimes[mmin[1]].y, aTimes[mmin[2]].z) );

      int aHitRgh = int(aTimeRgh <= aTimeOut) & int(aTimeOut >= 0.f) & int(aTimeRgh <= theHit.Time);