Color a surface using volume data at a range of offsets

[shawn.zheng@…]

Shawn Zheng asked about coloring a membrane surface from a tomogram using the average value of the tomogram projected along the surface normal vectors.

Currently the "color sample" command can color the surface using volume values offset from the surface along the surface normal vectors using the "offset" option, for example

color sample #5 map #1 palette -40,black:40,white offset 40

Would like to allow the offset option to accept 3 values: a starting offset, ending offset, and step size, for example

color sample #5 map #1 palette -40,black:40,white offset 40,100,10

which would take average volume value at offsets 40, 50, 60, 70, 80, 90, 100 Angstroms and color the surface using that average value.

[Tom Goddard]

Done. In ChimeraX daily builds dated May 2, 2024 or later.

I've attached an image showing this for coloring membrane surfaces of tomogram EMDB 10780.

[Tom Goddard]

Membrane surfaces of EMDB 10780 colored using average map value at 4 to 10 nm from surface.