We support a hierarchical scene graph for defining a 3D scene. We define the Node to be the basic building block. Currently a node may be a:
Group
Mesh
Light
All nodes inherit the transform (coordinate space) of their parent.
Groups define a set of children nodes, and a coordinate space which all children nodes inhabit.
The complete order of transformations within a Group node is the following:
Inherited transform from parent
Local (bind) transform from scene graph

Deformation transforms
Translation
Rotation (around Xaxis, followed by Yaxis and finally Zaxis)
Scaling
Meshes and Lights are leaf nodes.
Meshes define:
Geometry
Material information related to portions of the geometry.
Lights may be one of 2 types:
Directional, best used for modelling distant constant light sources, such as the sun
Point (or omnidirectional) lights, best used for lights that emanate from a position, such as a lamp, etc.
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