I have an invisible mesh that is the parent of a few child boxes, ordered horizontally one near the other. I'm using the following line to figure out the size of a mesh: getBoundingInfo().boundingBox.extendSize.scale(2) When called on each of the child boxes, the vector returned is correct. When called on the parent mesh, (0, 0, 0) is returned. Is there a way to get the size of the parent, taking into account all of its children?