Hide demolisher segments individually

[sparr]

I'm working on a mod with Dune/Beetlejuice style sandworms and I'd like to use segmented-unit to take advantage of all the existing engine support for them.

The single biggest blocker for me is that there seems to be no way to make a single segment invisible, which I need to do one segment at a time as the worm burrows underground or rises out of the desert.

Candidates:

• LuaSegment.render_to_forces
• SegmentPrototype.animation as RotatedAnimationVariations instead of RotatedAnimation, then LuaSegment.graphics_variation
• ??