diff --git a/src/map.rs b/src/map.rs
index 97e74f5..0a83468 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -14,6 +14,7 @@ pub enum Error{
 	InvalidHeader(binrw::Error),
 	InvalidBlockId(BlockId),
 	InvalidMeshId(model::MeshId),
+	InvalidModelId(model::ModelId),
 	InvalidTextureId(model::TextureId),
 	InvalidData(binrw::Error),
 	IO(std::io::Error),
@@ -168,18 +169,20 @@ struct Region{
 	//consider including a bvh in the region instead of needing to rebalance the physics bvh on the fly
 	model_count:u32,
 	#[br(count=model_count)]
-	models:Vec<newtypes::model::Model>,
+	models:Vec<(u32,newtypes::model::Model)>,
 }
 
 //code deduplication reused in into_complete_map
-fn read_region<R:BinReaderExt>(file:&mut crate::file::File<R>,block_id:BlockId)->Result<Vec<model::Model>,Error>{
+fn read_region<R:BinReaderExt>(file:&mut crate::file::File<R>,block_id:BlockId)->Result<Vec<(model::ModelId,model::Model)>,Error>{
 	//load region from disk
 	//parse the models and determine what resources need to be loaded
 	//load resources into self.resources
 	//return Region
 	let mut block=file.block_reader(block_id).map_err(Error::File)?;
 	let region:Region=block.read_le().map_err(Error::InvalidData)?;
-	Ok(region.models.into_iter().map(Into::into).collect())
+	Ok(region.models.into_iter().map(|(model_id,model)|
+		(model::ModelId::new(model_id),model.into())
+	).collect())
 }
 fn read_mesh<R:BinReaderExt>(file:&mut crate::file::File<R>,block_id:BlockId)->Result<model::Mesh,Error>{
 	let mut block=file.block_reader(block_id).map_err(Error::File)?;
@@ -251,7 +254,7 @@ impl<R:BinReaderExt> StreamableMap<R>{
 		self.bvh.the_tester(aabb,&mut |&block_id|block_ids.push(block_id));
 		block_ids
 	}
-	pub fn load_region(&mut self,block_id:BlockId)->Result<Vec<model::Model>,Error>{
+	pub fn load_region(&mut self,block_id:BlockId)->Result<Vec<(model::ModelId,model::Model)>,Error>{
 		read_region(&mut self.file,block_id)
 	}
 	pub fn load_mesh(&mut self,mesh_id:model::MeshId)->Result<model::Mesh,Error>{
@@ -263,14 +266,18 @@ impl<R:BinReaderExt> StreamableMap<R>{
 		read_texture(&mut self.file,block_id)
 	}
 	pub fn into_complete_map(mut self)->Result<strafesnet_common::map::CompleteMap,Error>{
-		let mut block_ids=Vec::new();
-		self.bvh.into_visitor(&mut |block_id|block_ids.push(block_id));
 		//count on reading the file in sequential order being fastest
-		block_ids.sort();
+		let mut block_ids=std::collections::BinaryHeap::new();
+		self.bvh.into_visitor(&mut |block_id|block_ids.push(block_id));
 		//load all regions
-		let mut models=Vec::new();
+		let mut model_pairs=HashMap::new();
 		for block_id in block_ids{
-			models.append(&mut read_region(&mut self.file,block_id)?);
+			model_pairs.extend(read_region(&mut self.file,block_id)?);
+		}
+		let mut models=Vec::with_capacity(model_pairs.len());
+		for model_id in 0..model_pairs.len() as u32{
+			let model_id=model::ModelId::new(model_id);
+			models.push(model_pairs.remove(&model_id).ok_or(Error::InvalidModelId(model_id))?);
 		}
 		//load all meshes
 		let mut meshes=Vec::with_capacity(self.resource_blocks.meshes.len());
@@ -302,7 +309,7 @@ fn collect_spacial_blocks(
 	block_location:&mut Vec<u64>,
 	block_headers:&mut Vec<SpacialBlockHeader>,
 	sequential_block_data:&mut std::io::Cursor<&mut Vec<u8>>,
-	bvh_node:strafesnet_common::bvh::BvhWeightNode<usize,newtypes::model::Model>
+	bvh_node:strafesnet_common::bvh::BvhWeightNode<usize,(model::ModelId,newtypes::model::Model)>
 )->Result<(),Error>{
 	//inspect the node weights top-down.
 	//When a node weighs less than the limit,
@@ -311,9 +318,9 @@ fn collect_spacial_blocks(
 		let mut models=Vec::new();
 		let mut model_count=0;
 		let extents=bvh_node.aabb().clone().into();
-		bvh_node.into_visitor(&mut |model|{
+		bvh_node.into_visitor(&mut |(model_id,model)|{
 			model_count+=1;
-			models.push(model);
+			models.push((model_id.get(),model));
 		});
 		let id=BlockId::new(block_headers.len() as u32+1);
 		block_headers.push(SpacialBlockHeader{
@@ -343,14 +350,14 @@ fn collect_spacial_blocks(
 /// otherwise sort by distance to start zone
 pub fn write_map<W:BinWriterExt>(mut writer:W,map:strafesnet_common::map::CompleteMap)->Result<(),Error>{
 	//serialize models and make a bvh that knows the file size of the branch
-	let boxen=map.models.into_iter().map(|model|{
+	let boxen=map.models.into_iter().enumerate().map(|(model_id,model)|{
 		//grow your own aabb
 		let mesh=map.meshes.get(model.mesh.get() as usize).ok_or(Error::InvalidMeshId(model.mesh))?;
 		let mut aabb=strafesnet_common::aabb::Aabb::default();
 		for &pos in &mesh.unique_pos{
 			aabb.grow(model.transform.transform_point3(pos));
 		}
-		Ok((model.into(),aabb))
+		Ok(((model::ModelId::new(model_id as u32),model.into()),aabb))
 	}).collect::<Result<Vec<_>,_>>()?;
 	let bvh=strafesnet_common::bvh::generate_bvh(boxen).weigh_contents(&|_|std::mem::size_of::<newtypes::model::Model>());
 	//build blocks