diff --git a/src/bsp.rs b/src/bsp.rs
index deb51ef..5df6131 100644
--- a/src/bsp.rs
+++ b/src/bsp.rs
@@ -77,7 +77,7 @@ where
 			let normal=face.normal();
 			let normal_idx=spam_normal.len() as u32;
 			spam_normal.push(valve_transform(<[f32;3]>::from(normal)));
-			let indices:Vec<model::VertexId>=face.vertex_positions().map(|vertex_position|{
+			let mut polygon_iter=face.vertex_positions().map(|vertex_position|{
 				let vertex_xyz=<[f32;3]>::from(vertex_position);
 				let pos=glam::Vec3A::from_array(vertex_xyz);
 				let pos_idx=spam_pos.len();
@@ -96,6 +96,13 @@ where
 					color:model::ColorId::new(0),
 				});
 				vertex_id
+			});
+			let polygon_list=std::iter::from_fn(move||{
+				match (polygon_iter.next(),polygon_iter.next(),polygon_iter.next()){
+					(Some(v1),Some(v2),Some(v3))=>Some(vec![v1,v2,v3]),
+					//ignore extra vertices, not sure what to do in this case, failing the whole conversion could be appropriate
+					_=>None,
+				}
 			}).collect();
 			if face.is_visible(){
 				//TODO: deduplicate graphics groups by render id
@@ -105,7 +112,7 @@ where
 				})
 			}
 			physics_group.groups.push(polygon_group_id);
-			model::PolygonGroup::PolygonList(model::PolygonList::new(vec![indices]))
+			model::PolygonGroup::PolygonList(model::PolygonList::new(polygon_list))
 		}).collect();
 		(
 			model::Mesh{