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New 3D graphics primitives in Mathematica 5.2


It is possible to define new 2D graphics primitives using PostScript[]. 
This is how the Graphics`Arrow` package works.

But does the user have any control over how 3D graphics are rendered? Is 
is possible to add new primitives, for example a line whose width 
depends on the distance from the ViewPoint (but not the viewing angle)?

A series of joined lines with varying thickness appears ugly. A polygon 
would be a more appropriate low-level representation for a line whose 
thickness changes linearly. But a 3D polygon appears differently from 
different angles, and one would need access to the mechanism of 
translating 3D graphics to a 2D projection to be able to use a 2D polygon.

Any suggestions for achieving this effect?

Szabolcs


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