Functions like yaw, moveForward and scale all work relative to the
local orientation of an Object3D. Functions and properties like
position, rotateX work relative to the transform of the parent
container. Properties like scenePosition return values relative to the
scene. So what names do you give to these coordinate systems? Global,
Parent, Local? There doesn't seem to be a real standard. It sounds
trivial, but it makes life difficult when you are trying to document
the space in which an object is moving.
