[Chimera-users] Fwd: Chimera crashes with MacPro show solid

Thomas Goddard goddard at cgl.ucsf.edu
Thu Nov 9 14:45:09 PST 2006

Peter EngelHardt replies about solid rendering crash on Mac.

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Date: Thu, 9 Nov 2006 22:42:41 +0300
To: Thomas Goddard <goddard at cgl.ucsf.edu>
From: Peter Engelhardt <engelhar at medi.mappi.helsinki.fi>
Subject: Re: [Chimera-users] Fwd: Chimera crashes with MacPro show solid

Dear Tom,

Thanks,   I did what you told and it all worked out very fine

Though a bit buggy - volumes disappear and appear 
suddenly - but under certain control anyhow.

Cheers and thanks again


>   The crash with solid rendering is almost surely a graphics driver bug.
>The solid rendering code works correctly on many different graphics cards
>and there is nothing in that code that works differently for stereo
>   Does the crash occur for solid rendering without stereo?

yes instantly

>   Does the size of the data set matter?

not tested

>   There are two solid rendering options that may avoid this crash.
>These are shown in the volume dialog using the Features / Solid Rendering
>Options menu entry.  From the back trace you sent I see the crash occurs
>when pushing the data to the graphics card and mapping the colors using
>a colormap.  If you turn off the option "Use colormap of size X for solids"
>then different code will be used -- colors will be computed on the CPU
>instead of on the graphics card.  A second change that may avoid the
>crash is turning off "Solids using 2D textures".  This makes Chimera use
>3 dimensional textures instead of 2 dimensional textures.
>	Tom

- -- 
Peter Engelhardt, PhD, docent
Assistant Professor in Molecular Genetics
Unit of Molecular Electron Tomography
Department of Pathology and Virology
Haartman Institute
P.O.Box 21, FI-00014 Univ. of Helsinki, Finland
Visiting Address: Haartmaninkatu 3, Helsinki

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