From: John Stone (
Date: Mon Feb 28 2005 - 10:48:25 CST

  The "Volume Slice" representation should work fine on your Mac so
long as you have enough video memory for the datasets you're displaying.
If you have trouble with this representation let me know.

Alas, this is not the case for the "color by volume" feature however:
  There's a known problem with MacOS X and the 3-D texturing VMD uses
for the "color by volume" feature. I've been working with the
Apple OpenGL engineers to fix the problem for a few days now.
They are working hard to narrow down the source of the problem
so it can be fixed in a minor update of MacOS X. I'll let everyone
know when we find a solution to this problem.


On Sat, Feb 26, 2005 at 09:32:42AM +0100, fabrizio cleri wrote:
> Hi again,
> some more info: I installed VMD on another almost-new
> Apple iBook G4 1.07Ghz with 768MB RAM, and I get to
> see some "volume slicing", in the form of monochrome
> plans showing a regular wavy pattern (option "color by
> Volume") or just flat monochrome (other color
> options). Played a little with "color scale data
> range" in the Trajectory panel, no changes.
> The hardware config test in this case reads:
> Info) Multithreading available, 1 CPU detected.
> Info) OpenGL renderer: ATI Radeon 9200 OpenGL Engine
> Info) Features: STENCIL RN MTX
> Info) Textures: 2-D (2048x2048), 3-D (128x128x128),
> Multitexture (6)
> Thanks,
> fc
> ________________________________________
> Fabrizio Cleri
> ENEA, Unità Materiali e Nuove Tecnologie
> Centro Ricerche Casaccia, s.p. 050
> C.P. 2400, I-00100 Roma A.D. (Italy)
> tel.: +39 06 30486844
> fax: +39 06 30483178
> e-mail:
> e-page:
> ___________________________________
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