Hello,

This seems to be a longstanding issue, unless there is a post I miss.

How can one specify a custom colormap for a volume? Bonus point for how to specify an alpha channel for voxel-specific transparency.

My immediate goal: visualize angle data with a colorbar that wraps around a full circle (same color for values 0 and 2pi). That would be enough for now, but ultimately I want these angles to display with high transparency for voxels where the estimate is uncertain (low 2-d vector magnitude).

Thanks for the help and

Have a great day!

Sebastien