Thanks for reporting the problem. I see the "Color outside volume" option of the Surface Color panel does nothing. Apparently I forgot to implement it when I ported it from Chimera to ChimeraX. I have now implemented it in the ChimeraX daily builds dated January 24, 2025 and newer. I also added an "outsideColor" option to the "color sample", "color gradient", and "color electrostatic" commands. The default outsideColor is gray (#808080).

On Jan 23, 2025, at 2:55 PM, Hansen, Bryan (NIH/NIAID) [E] via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:

Hi,

I’m having issues with coloring a surface by volume. When I compare the two volumes I don’t get the larger volume completely colored and even when I set ‘Color outside volume’ to match the same color as the 0 value which in this case is the blue it still renders grey. Can you help me with which step I’m messing up? Thanks.

Bryan Hansen
Computational Biologist / Electron Microscopist
NIH/NIAID/RTB/RML/EMU
Rocky Mountain Laboratories
903 S. 4^th St
Hamilton, MT 59840
406.363.9202

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