Hi, I have a question when using this software to visualize a brain parcellation result. 
The parcellation involves several volumetic clusters which jointly cover the whole brain but does not overlap with each other.

When I use ih.curv and overlay all the parcellation clusters, neighboring clusters have overlap in the border.  And the color become merged (red + yellow = orange).
How can I avoid such unnecessary overlap?    A possible way I can thought of is making the overlay transparent to each other, which at least can make overlap disappears. 
But I cannot find that option like the one in MRIcron.

Any suggestions? Thanks a lot!