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MathGroup Archive 1999

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Re: Re: RealTime3D in v4.0

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19754] Re: [mg19730] Re: RealTime3D in v4.0
  • From: Russell Towle <rustybel at foothill.net>
  • Date: Wed, 15 Sep 1999 03:53:05 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

> (2) How does RealTime3D work on a Mac? On my machine (PowerMac 7300,
> MacOS 8.1) it outputs something, but this appears unmanipulable
> (with a 1 button mouse at least?) and the viewpoint is along the
> z-axis.

It works OK on my Blue PowerMac, except I have discovered that if one
specifies a ViewPoint with a magnitude of less than about 2.25, the graphic
may not fit properly within the display region. Also, at times nothing
appears at all until one selects the graphic and holds the mouse button
down.

Real-time rotation is fluid, even with very complicated polyhedra. However,
it gives every impression that it is not the polyhedron itself which
rotates, but the viewpoint; meanwhile the LightSource vectors remain fixed;
so that one may rotate the viewpoint into such a position that only the
"dark" side of the polyhedron is visible.

Russell Towle
Box 141
Dutch Flat, CA 95714
(530) 389-2872




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