Allows you to define your own lights for use in RB3DSpace worlds.
Notes
It is invalid to use a light with Position and Direction either both Nil, or both non-nil.
If the Attenuation value is 1 or 2, the effect of the light decreases with distance; so you may need to increase the Brightness substantially or make your objects smaller and closer to the light.
See Also
Bounds3D, ColorList, Element3D, Group3D, Light3D, Material, Object3D, Quaternion, TriangleList, Trimesh, UVList, Vector3D, VectorList classes; RB3DSpace control.