Hi
Chad,
If the ribbon shape is not recomputed then your morph would not move, probably not the best result. A faster CPU might make a small difference, probably not significant. The ribbon calculation is not multi-threaded so it can only use a single CPU core.
Here are two ideas. First you can record a movie using that button at the far right of the morph slider. The movie can be played back and forth as fast as you like in a movie player. The second idea is that maybe it would compute the ribbon faster if the
ribbon is at lower quality. Try a command like
graphics quality ribbonSides 4 ribbonDivisions 5
The ribbonDivisions option is how many segments of the smooth ribbon curve lie between two amino acids. The ribbonSides is how many segments around a cross-section of the ribbon.
https://www.cgl.ucsf.edu/chimerax/docs/user/commands/graphics.html#quality
I have never investigated if that is the speed bottleneck. It well may be earlier parts of the computation computing the cubic spline. Most likely it is some part of the computation that is done in Python instead of C++. I optimized the ribbon code
many years ago so there are probably not simple code changes that will speed it up.
Tom
Ah, much faster! Is there a way to show ribbons without having it recompute the shape at every step? Is this something a more powerful computer could handle? I'm not driving a Rolls Royce yet, but maybe one day.
Cheers,
Chad
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Ok, next thought is if you are showing ribbons it has to recompute the ribbon shape every time step and that takes some time. How fast is it in sphere display style?
Tom
Hi Tom,
Interesting, changing the lighting to "simple" does cut the 3D GPU usage by ~50% but doesn't increase the pace of coordset advancement (~7 frames per second).
Thanks,
Chad
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Hi Chad,
The problem is probably you are using "soft" or "full" lighting which computes ambient shadows from 64 directiions each time the shape of the protein changes. That is done on the graphics card and is time consuming. Switch to simple lighting (command
"light simple") or use the icon in the toolbar.
Tom
On Sep 27, 2024, at 4:41 PM, Altobelli, Chad via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
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