So, I was trying out creating a part using an edited blueprint image, and I
needed to use the water_level keyword to remove that bit of base plane.

Then I nearly lost my mind trying to figure out why things "weren't working"
when I tried to difference out a cylinder for nice clean hole - and the cylinder
was VISIBLE - but only on one side... :O

Well, apparently the water_level "deleted" section doesn't get deleted - it just
isn't visible.   But when the cylinder gets differenced from it, that surface
becomes visible, even if the cylinder doesn't have a texture, and the whole CSG
gets an overall texture.

That complicates things more than you'd think, because I do a lot of scaling in
the heightfield definition, and now I have to do that in a separate CSG
operation to difference away a box, or intersect one, etc.


What do we think?   Is this a "bug"?
Has anyone ever seen this before?

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