diff --git a/src/model_physics.rs b/src/model_physics.rs
index a049e34..366082c 100644
--- a/src/model_physics.rs
+++ b/src/model_physics.rs
@@ -1,6 +1,6 @@
 use std::borrow::{Borrow,Cow};
 use std::collections::{HashSet,HashMap};
-use strafesnet_common::model::{self,PolygonIter};
+use strafesnet_common::model::{self,MeshId,PolygonIter};
 use strafesnet_common::zeroes;
 use strafesnet_common::integer::{self,Planar64,Planar64Vec3};
 
@@ -110,8 +110,18 @@ struct PhysicsMeshTopology{
 	edge_topology:Vec<EdgeRefs>,
 	vert_topology:Vec<VertRefs>,
 }
-#[derive(id::Id)]
+#[derive(Hash,id::Id,Eq,PartialEq)]
 pub struct PhysicsMeshId(u32);
+impl Into<MeshId> for PhysicsMeshId{
+	fn into(self)->MeshId{
+		MeshId::new(self.0)
+	}
+}
+impl From<MeshId> for PhysicsMeshId{
+	fn from(value:MeshId)->Self{
+		Self::new(value.get())
+	}
+}
 #[derive(Debug,Clone,Copy,Hash,id::Id,Eq,PartialEq)]
 pub struct PhysicsSubmeshId(u32);
 pub struct PhysicsMesh{
@@ -417,9 +427,9 @@ impl MeshQuery<SubmeshFaceId,SubmeshDirectedEdgeId,SubmeshVertId> for PhysicsMes
 }
 
 pub struct PhysicsMeshTransform{
-	vertex:integer::Planar64Affine3,
-	normal:integer::Planar64Mat3,
-	det:Planar64,
+	pub vertex:integer::Planar64Affine3,
+	pub normal:integer::Planar64Mat3,
+	pub det:Planar64,
 }
 impl PhysicsMeshTransform{
 	pub const fn new(transform:integer::Planar64Affine3)->Self{
diff --git a/src/physics.rs b/src/physics.rs
index c7a9f2f..6a2d35e 100644
--- a/src/physics.rs
+++ b/src/physics.rs
@@ -6,7 +6,7 @@ use strafesnet_common::bvh;
 use strafesnet_common::map;
 use strafesnet_common::aabb;
 use strafesnet_common::gameplay_modes;
-use strafesnet_common::gameplay_attributes;
+use strafesnet_common::gameplay_attributes::{self,CollisionAttributesId};
 use strafesnet_common::model::ModelId;
 use strafesnet_common::gameplay_style::{self,StyleModifiers};
 use strafesnet_common::instruction::{self,InstructionEmitter,InstructionConsumer,TimedInstruction};
@@ -170,17 +170,17 @@ impl PhysicsModels{
 	//TODO: "statically" verify the maps don't refer to any nonexistant data, if they do delete the references.
 	//then I can make these getter functions unchecked.
 	fn mesh(&self,convex_mesh_id:ConvexMeshId)->TransformedMesh{
-		let model_idx=convex_mesh_id.model_id.get() as usize;
+		let model=self.models[&convex_mesh_id.model_id];
 		TransformedMesh::new(
-			self.meshes[model_idx].submesh_view(convex_mesh_id.submesh_id),
-			&self.models[model_idx].transform
+			self.meshes[&model.mesh_id].submesh_view(convex_mesh_id.submesh_id),
+			&model.transform
 		)
 	}
 	fn model(&self,model_id:PhysicsModelId)->&PhysicsModel{
-		&self.models[model_id.get() as usize]
+		&self.models[&model_id]
 	}
 	fn attr(&self,model_id:PhysicsModelId)->&PhysicsCollisionAttributes{
-		&self.attributes[self.models[model_id.get() as usize].attr_id.get() as usize]
+		&self.attributes[&self.models[&model_id].attr_id]
 	}
 	fn push_mesh(&mut self,mesh:PhysicsMesh){
 		self.meshes.push(mesh);
@@ -470,9 +470,18 @@ impl TryFrom<&gameplay_attributes::CollisionAttributes> for PhysicsCollisionAttr
 		}
 	}
 }
-#[derive(id::Id)]
+#[derive(Hash,id::Id,Eq,PartialEq)]
 struct PhysicsAttributesId(u32);
-
+impl Into<CollisionAttributesId> for PhysicsAttributesId{
+	fn into(self)->CollisionAttributesId{
+		CollisionAttributesId::new(self.0)
+	}
+}
+impl From<CollisionAttributesId> for PhysicsAttributesId{
+	fn from(value:CollisionAttributesId)->Self{
+		Self::new(value.get())
+	}
+}
 //unique physics meshes indexed by this
 #[derive(Debug,Clone,Copy,Eq,Hash,PartialEq)]
 struct ConvexMeshId{