better zoom management

src/lib/Physics.js

@@ -1,4 +1,5 @@
 import * as RAPIER from '@dimforge/rapier3d'
+import { Vector3 } from 'three';
 class Physics{
     constructor(engine){
         this.engine = engine
@@ -51,10 +52,20 @@ class Physics{
             break
 
             default:{
-                colliderDesc = RAPIER.ColliderDesc.trimesh(
-                    mesh.geometry.attributes.position.array,
-                    mesh.geometry.index?.array
-                )
+                const vertices = [];
+                const vertex = new Vector3();
+                const position = mesh.geometry.getAttribute( 'position' );
+                for ( let i = 0; i < position.count; i ++ ) {
+                    vertex.fromBufferAttribute( position, i );
+                    vertices.push( vertex.x, vertex.y, vertex.z );
+                }
+
+                // if the buffer is non-indexed, generate an index buffer
+                const indices = mesh.geometry.getIndex() === null
+                    ? Uint32Array.from( Array( parseInt( vertices.length / 3 ) ).keys() )
+                    : mesh.geometry.getIndex().array;
+
+                colliderDesc = RAPIER.ColliderDesc.trimesh( vertices, indices );
             }
             break
         }