Ejemplo n.º 1
0
        private int boxZCompare(Hitable a, Hitable b)
        {
            aabb boxLeft  = new aabb();
            aabb boxRight = new aabb();

            if (!a.boundingBox(ref boxLeft) || !b.boundingBox(ref boxRight))
            {
                throw new ArgumentException("");
            }

            if (boxLeft.min.z - boxRight.min.z < 0.0)
            {
                return(-1);
            }
            else
            {
                return(1);
            }
        }
Ejemplo n.º 2
0
        public bvh_node(List <Hitable> hitables, int n)
        {
            int axis = (int)Utils.rand(0, 3);

            if (axis == 0)
            {
                hitables.Sort(0, n, Comparer <Hitable> .Create(boxXCompare));
            }
            else if (axis == 1)
            {
                hitables.Sort(0, n, Comparer <Hitable> .Create(boxYCompare));
            }
            else
            {
                hitables.Sort(0, n, Comparer <Hitable> .Create(boxZCompare));
            }

            if (n == 1)
            {
                left  = hitables[0];
                right = hitables[0];
            }
            else if (n == 2)
            {
                left  = hitables[0];
                right = hitables[1];
            }
            else
            {
                left  = new bvh_node(hitables.GetRange(0, n / 2), n / 2);
                right = new bvh_node(hitables.GetRange(n / 2, n - n / 2), n - n / 2);
            }

            aabb boxLeft  = new aabb();
            aabb boxRight = new aabb();

            if (!left.boundingBox(ref boxLeft) || !right.boundingBox(ref boxRight))
            {
                throw new ArgumentException("No Bounding box in boh_node constructor");
            }

            box = aabb.surrounding_box(boxLeft, boxRight);
        }