step 1: npm i cannon-utils step 2: import cu from ‘cannon-utils’; step 3: create shape, pass mesh and size shape: cu.CreateTriMesh(mesh, { x: 5, y: 5, z: 5 }); full example gltfLoader.load(‘file_location.glb’, gltf => { gltf.scene.scale.set(2, 2, 2); const cannon_shape = cu.CreateTriMesh(gltf.scene.children[1], { x: 5, y: 5, z: 5 }); const body = new CANNON.Body({ shape: cannon_shape, mass: 1 });