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Re: New 3D graphics primitives in Mathematica 5.2

• To: mathgroup at smc.vnet.net
• Subject: [mg76174] Re: New 3D graphics primitives in Mathematica 5.2
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 17 May 2007 06:00:46 -0400 (EDT)
• Organization: Uni Leipzig
• References: <f2eivi$t7p$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de

Hi,

since the graphics objects know nothing about the options of the
Graphics3D[] object, the objects will never find out what is in the
options list and can't access the value of the ViewPoint option.
but you can make a function that take the Graphics3D[] object and
update the ViewPoint.

For you 3d lines that change the thickness, it would be better to make
a tube with changing diameter.

Regards
   Jens

Szabolcs wrote:
> 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
>