From: John Stone (
Date: Fri Apr 13 2007 - 22:09:35 CDT

  I'm betting that the Quadro NVS cards are based on the older
chipset which doesn't support full GLSL. It is possible they don't
correctly handle the gl_FrontFacing attribute, which is the one
thing that VMD 1.8.6 requires. With the older versions of VMD we
used a workaround for this problem since a lot of people had older
cards still, but the workaround had limitations and degraded the
resulting image quality. For VMD 1.8.6 we're now requiring fully
compliant GLSL. You can determine if the gl_FrontFacing is the
issue by setting the VMDGLSLVERBOSE variable in your system settings
(I'm assuming this is a Windows system since you listed the driver
 version 84.26..)

If that's indeed the issue, I'd recommend upgrading to a newer
video bard, as even inexpensive GeForce cards will leave the older
Quadro NVS 28x cards in the dust.

  John Stone

On Fri, Apr 13, 2007 at 07:18:23PM -0600, Luis Rosales wrote:
> Hi!!
> Just wondering if anybody has experienced problems with the GLSL
> rendering in the new version of VMD...
> I just downloaded and installed it, and tried that feature, andI got
> the following message:
> Warning) GPU driver failed to compile shader:
> Warning) C:/Proteins/VMD//shaders/vmd
> Warning) This GPU/driver is buggy, or doesn't fully implement GLSL.
> Warning) Set environment variable VMDGLSLVERBOSE for more info.
> Info) GLSL rendering mode is NOT available.
> as expected, if I use the GLSL option I got the message:
> Warning) OpenGL Programmable Shading not available.
> I have a graphic card NVIDIA Quadro NVS 285 with the driver
> (the latest version, as far as I know...) In the past I used GLSL VMD
> 1.8.5 without problems...
> Any ideas??
> As usual, thanks for your help!!
> Luis
> --
> ---------------------------------------------------
> Dr. Luis Rosales León
> Departamento de Visualización Científica
> Dirección General de Servicios de Cómputo Académico
> Universidad Nacional Autonoma de México
> AP 70228, Cd. Universitaria
> México, D.F. 04510
> Tel: 56228582
> Fax: 56228043
> ---------------------------------------------------

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