Geometry is a collection of SubGeometries, each of which contain the actual geometrical data such as vertices,
normals, uvs, etc.|
Object3D provides a base class for any 3D object that has a (local) transformation.
The standard order for transformation is [parent transform] (Translate+Pivot) (Rotate) (-Pivot) (Scale) [child transform]
This is the order of matrix multiplications, left-to-right.|
SkinnedSubGeometry provides a SubGeometry extension that contains data needed to skin vertices.|
The SubGeometry class is a collections of geometric data that describes a triangle mesh.|
SubMesh wraps a SubGeometry as a scene graph instantiation.|