Subset of OpenInventor (high level graphics, used by Iris Explorer, which is based on OpenGL (low level graphics). OpenGL will be de-facto standart (part of WNT, not yet on HP).
As VRML is based on OpenGL, it's not well OO. It more reflects geometrical view
of the world and the X11-style programming. I've looked at the VRML objects (nodes) and tried
to their relations which may be used for including in OO program. My proposition is based on
VRML version 1.0 for simplicity.