Colors for overlaying volumes

Question

I'm trying to overlay several NRRD (volume) files to show ROIs etc on top of a volume. Is there a way to set the color of a volume to, say, red? Any suggestions on approaching this?

Thanks

Answer 1

XTK supports 1 volume and 1 label map together.

You probably want to do the following like in this lesson: http://jsfiddle.net/gh/get/library/pure/xtk/lessons/tree/master/11/#run

The colored overlays is the labelmap which maps the scalar values of a .nrrd file to colors using a color table. This example uses the 3D Slicer colortable but it also works with the Freesurfer colortable.

If you have multiple .nrrd files containing each one label, you first have to add them to load them as one label map. Then, you can write your own colortable or use a standard one to colorize the label map.

Color tables have the following format:

0 background 0 0 0 0
1 tissue 128 174 128 255
2 bone 241 214 145 255
3 skin 177 122 101 255
4 connective_tissue 111 184 210 255

So scalar value, some name, r, g, b, a