diff --git a/src/bvh.rs b/src/bvh.rs
index e4f0bf6..e5427f9 100644
--- a/src/bvh.rs
+++ b/src/bvh.rs
@@ -25,10 +25,10 @@ pub struct BvhNode<T>{
 	aabb:Aabb,
 }
 
-impl<T:Copy+Eq+std::hash::Hash> BvhNode<T>{
-	pub fn the_tester<F:FnMut(T)>(&self,aabb:&Aabb,f:&mut F){
+impl<T> BvhNode<T>{
+	pub fn the_tester<F:FnMut(&T)>(&self,aabb:&Aabb,f:&mut F){
 		match &self.content{
-			&BvhNodeContent::Leaf(model)=>f(model),
+			BvhNodeContent::Leaf(model)=>f(model),
 			BvhNodeContent::Branch(children)=>for child in children{
 				//this test could be moved outside the match statement
 				//but that would test the root node aabb
@@ -50,11 +50,11 @@ impl<T:Copy+Eq+std::hash::Hash> BvhNode<T>{
 	}
 }
 
-pub fn generate_bvh<T:Copy+Eq+std::hash::Hash>(boxen:Vec<(T,Aabb)>)->BvhNode<T>{
+pub fn generate_bvh<T>(boxen:Vec<(T,Aabb)>)->BvhNode<T>{
 	generate_bvh_node(boxen,false)
 }
 
-fn generate_bvh_node<T:Copy+Eq+std::hash::Hash>(boxen:Vec<(T,Aabb)>,force:bool)->BvhNode<T>{
+fn generate_bvh_node<T>(boxen:Vec<(T,Aabb)>,force:bool)->BvhNode<T>{
 	let n=boxen.len();
 	if force||n<20{
 		let mut aabb=Aabb::default();
@@ -74,12 +74,12 @@ fn generate_bvh_node<T:Copy+Eq+std::hash::Hash>(boxen:Vec<(T,Aabb)>,force:bool)-
 		let mut sort_x=Vec::with_capacity(n);
 		let mut sort_y=Vec::with_capacity(n);
 		let mut sort_z=Vec::with_capacity(n);
-		for (i,aabb) in boxen.iter(){
+		for (i,(_,aabb)) in boxen.iter().enumerate(){
 			let center=aabb.center();
-			octant.insert(*i,0);
-			sort_x.push((*i,center.x()));
-			sort_y.push((*i,center.y()));
-			sort_z.push((*i,center.z()));
+			octant.insert(i,0);
+			sort_x.push((i,center.x()));
+			sort_y.push((i,center.y()));
+			sort_z.push((i,center.z()));
 		}
 		sort_x.sort_by(|tup0,tup1|tup0.1.cmp(&tup1.1));
 		sort_y.sort_by(|tup0,tup1|tup0.1.cmp(&tup1.1));
@@ -106,7 +106,7 @@ fn generate_bvh_node<T:Copy+Eq+std::hash::Hash>(boxen:Vec<(T,Aabb)>,force:bool)-
 		//generate lists for unique octant values
 		let mut list_list=Vec::with_capacity(8);
 		let mut octant_list=Vec::with_capacity(8);
-		for (i,aabb) in boxen.into_iter(){
+		for (i,(data,aabb)) in boxen.into_iter().enumerate(){
 			let octant_id=octant[&i];
 			let list_id=if let Some(list_id)=octant_list.iter().position(|&id|id==octant_id){
 				list_id
@@ -116,7 +116,7 @@ fn generate_bvh_node<T:Copy+Eq+std::hash::Hash>(boxen:Vec<(T,Aabb)>,force:bool)-
 				list_list.push(Vec::new());
 				list_id
 			};
-			list_list[list_id].push((i,aabb));
+			list_list[list_id].push((data,aabb));
 		}
 		let mut aabb=Aabb::default();
 		if list_list.len()==1{