static inline void normalizeBox3(const Box3& target, const Box3& env, Box3& output)
{
auto scale = env.Diagonal();
auto center = env.Center();
output.Set((target.Min()-center)/scale*2.0,
(target.Max()-center)/scale*2.0);
}
void BSPOctree::SplitSpaceByXYZ(const Box3& bbox, Box3 childBoxes[])
{
vec3<float> minOffset, maxOffset;
const double factor = pow(2.0, 11);
double3 step = double3(
staticFilter(bbox.Diagonal().x* 0.5, factor)
, staticFilter(bbox.Diagonal().y*0.5, factor)
, staticFilter(bbox.Diagonal().z*0.5, factor));
for (int i = 0; i < 8 ; i++)
{
maxOffset.z = i & 1 ? 0 : -step.z;
maxOffset.y = i & 2 ? 0 : -step.y;
maxOffset.x = i & 4 ? 0 : -step.x;
minOffset.z = i & 1 ? step.z : 0;
minOffset.y = i & 2 ? step.y : 0;
minOffset.x = i & 4 ? step.x : 0;
childBoxes[i].Set(bbox.Min() + minOffset, bbox.Max()+ maxOffset);
}
}
