There are the two commands volshow and labelvolshow. The former one can display 3D intensity data with a light source and the latter labeled 3D data but without a light source. I'd like to display 3D labeled data with a light source so I can see the 3D structures/texture etc. Actually this should work by defining a colormap when using volshow, but it only accepts colormaps in 256x3 format and I'd like to define a colormap for labels. So if I have the labels [1,2,3] in my 3D data, I'd like to define for each label a color, such that the colormap would look like [1,0,0; 0,1,0; 0,0,1]. Is there a way so that could work properly?