Hi Peter,
While not positive, I do not believe there is any current
way to initialize dimming factors for general data.
I think the purpose of 'Dim' was to just make the colors
less bright, like an alpha control. But the way dimming
was implemented, I believe, the 1-Dim factor essentially
goes to the underlay, all else being equal. The view of
those surface contours can be separately controlled, so
it does not need to be a mix.
- rick