Each instance with their own parametric masks, this was the solution that worked best for me., much better than anything else I have come across, to date. Just the way I wanted it - 3 zones, (or whatever number I can create if needed)
Now stored as presets, which I can recall, and adjust in any image. Very easily and quickly, to deal with the broad direction of how I want to light the scene. In practice, they just behave like lights(or shades if used with negative luminosity), that I can turn on and off.
And with ease can adjust how bright or dark each light or shade in each region is is. etc, etc…
One slider for luminosity, for each region, in each instance. Simplest solution ever.
Thanks
