BoundingBox wrong calculation with Skinned Meshes?

[donmccurdy]

You can compute a perfect bounding box manually if you want:

Accurate GLTF bounding box

Here’s code for accurately fitting a THREE.Box3 to a THREE.SkinnedMesh — const vector = new THREE.Vector3(); const box = new THREE.Box3().makeEmpty(); const position = mesh.geometry.attributes.position; for ( let i = 0, il = position.count; i < il; i ++ ) { vector.fromBufferAttribute( position, i ); mesh.boneTransform( i, vector ); mesh.localToWorld( vector ); box.expandByPoint( vector ); } The code above computes the bounding box in world space; omit localToWorld if you prefer local sp…

But usually it’s too expensive to do that every frame as a character moves, and so the default bounding box computation doesn’t try to take armatures into account.