common: bvh: empty not Default

engine/physics/src/physics.rs

@@ -935,7 +935,7 @@ pub struct PhysicsData{
 impl Default for PhysicsData{
 	fn default()->Self{
  		Self{
-			bvh:bvh::BvhNode::default(),
+			bvh:bvh::BvhNode::empty(),
 			models:Default::default(),
 			modes:Default::default(),
 			hitbox_mesh:StyleModifiers::default().calculate_mesh(),

lib/common/src/bvh.rs

@@ -14,8 +14,8 @@ pub enum RecursiveContent<R,T>{
 	Branch(Vec<R>),
 	Leaf(T),
 }
-impl<R,T> Default for RecursiveContent<R,T>{
-	fn default()->Self{
+impl<R,T> RecursiveContent<R,T>{
+	pub fn empty()->Self{
 		Self::Branch(Vec::new())
 	}
 }
@@ -23,16 +23,13 @@ pub struct BvhNode<T>{
 	content:RecursiveContent<BvhNode<T>,T>,
 	aabb:Aabb,
 }
-impl<T> Default for BvhNode<T>{
-	fn default()->Self{
+impl<T> BvhNode<T>{
+	pub fn empty()->Self{
 		Self{
-			content:Default::default(),
+			content:RecursiveContent::empty(),
 			aabb:Aabb::default(),
 		}
 	}
-}
-
-impl<T> BvhNode<T>{
 	pub fn the_tester<F:FnMut(&T)>(&self,aabb:&Aabb,f:&mut F){
 		match &self.content{
 			RecursiveContent::Leaf(model)=>f(model),