discard unnecessary comment information

lib/src/bvh.rs

@@ -38,13 +38,7 @@ impl Bvh{
 			let slice_len=len/count;
 			bvh_nodes.reserve(count);
 			// 0123456789
-			// last_index=0
-			// split_index=9
-			// index=10
-			// len=10
-			// count=3
-			// node_len=4
-			// split into groups of 4
+			// split into groups of MAX_SLICE_LEN=4
 			// [0123][4567][89]
 			let mut push_slice=|slice:Range<usize>|{
 				let mut aabb=Aabb::default();