public BVH_Node(List <Hitable> list, float time0, float time1)
{
Objlist = list;
int axis = Mathf.FloorToInt(zRandom.drand() * 3f);
if (axis == 0)
{
list.Sort((a, b) =>
{
rtAABB box_left = new rtAABB(), box_right = new rtAABB();
if (!a.bounding_box(0, 0, ref box_left) || !b.bounding_box(0, 0, ref box_right))
{
Debug.LogError(" no bounding box in bvh_node constructor");
}
if (box_left._min.x - box_right._min.x < 0f)
{
return(-1);
}
else
{
return(1);
}
});
}
else if (axis == 1)
{
list.Sort((a, b) =>
{
rtAABB box_left = new rtAABB(), box_right = new rtAABB();
if (!a.bounding_box(0, 0, ref box_left) || !b.bounding_box(0, 0, ref box_right))
{
Debug.LogError(" no bounding box in bvh_node constructor");
}
if (box_left._min.y - box_right._min.y < 0f)
{
return(-1);
}
else
{
return(1);
}
});
}
else
{
list.Sort((a, b) =>
{
rtAABB box_left = new rtAABB(), box_right = new rtAABB();
if (!a.bounding_box(0, 0, ref box_left) || !b.bounding_box(0, 0, ref box_right))
{
Debug.LogError(" no bounding box in bvh_node constructor");
}
if (box_left._min.z - box_right._min.z < 0f)
{
return(-1);
}
else
{
return(1);
}
});
}
int n = list.Count;
if (n == 1)
{
left = right = list[0];
}
else if (n == 2)
{
left = list[0];
right = list[1];
}
else
{
left = new BVH_Node(list.GetRange(0, n / 2), time0, time1);
right = new BVH_Node(list.GetRange(n / 2, n - n / 2), time0, time1);
}
rtAABB box_l = new rtAABB(), box_r = new rtAABB();
if (!left.bounding_box(time0, time1, ref box_l) || !right.bounding_box(time0, time1, ref box_r))
{
Debug.LogError(" no bounding box in bvh_node constructor");
}
box = rtAABB.surrounding_box(box_l, box_r);
}
