vec2 CalcTexCoords()
{
  vec2 tempTexCoords;
  switch (projector)
  {
  case PROJ_CUBE:
    {
      vec3 absVec;
      if (texEntity == TEXENT_NORMAL)
        absVec = abs(vNormal);
      else // TEXENT_POSITION
        absVec = abs(vPos);
      vec2 UV;

      // +-X
      if (absVec.x >= absVec.y && absVec.x >= absVec.z)
      {
        if (vPos.x < 0.0)
          (UV.s = vPos.z);
        else
          (UV.s = -vPos.z);
        UV.t = vPos.y;
        UV.s /= maxbox.z;
        UV.t /= maxbox.y;
        //UV.s /= absVec.x;
        //UV.t /= absVec.x;
      }
      // +-Y
      else if (absVec.y >= absVec.x && absVec.y >= absVec.z)
      {
        if (vPos.y < 0.0)
          (UV.t = vPos.z);
        else
          (UV.t = -vPos.z);
        UV.s = vPos.x;
        UV.s /= maxbox.x;
        UV.t /= maxbox.z;
      }
      // +-Z
      else
      {
        if (vPos.z < 0.0)
          (UV.s = -vPos.x);
        else
          (UV.s = vPos.x);
        UV.t = vPos.y;
        UV.s /= maxbox.x;
        UV.t /= maxbox.y;
      }

      UV = (UV + 1.f) / 2.f;
      tempTexCoords = UV;
    }
    break;
  case PROJ_SPHERE:
    {
      vec3 tpos;
      if (texEntity == TEXENT_POSITION)
        tpos = vPos - center;
      else if (texEntity == TEXENT_NORMAL)
        tpos = vNormal;
      float theta = atan(tpos.y / tpos.x);
      float Z = (tpos.z - minbox.z) / (maxbox.z - minbox.z);
      float r = length(tpos);
      float phi = acos(tpos.z / r);
      float U = theta / TWO_PI; // convert to 0-1 range
      float V = (PI - phi) / (PI);
      tempTexCoords = vec2(U, V);
    }
    break;
  case PROJ_CYLINDER:
    {
      vec3 tpos;
      if (texEntity == TEXENT_POSITION)
        tpos = vPos - center;
      else if (texEntity == TEXENT_NORMAL)
        tpos = vNormal;
      float theta = atan(tpos.y / tpos.x);
      float Z = (tpos.z - minbox.z) / (maxbox.z - minbox.z);
      float U = theta / TWO_PI; // convert to 0-1 range
      float V = Z;
      tempTexCoords = vec2(U, V);
    }
    break;
  default:
    break;
  }
  return tempTexCoords;
}