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When any member of a revolved group had an opacity below 100% or a blending mode, every member's surface was drawn whole in member order, so the opaque members lost their shared depth sort and a transparent member drew entirely over or under the others. Every member's faces are now sorted into one order. Opaque faces go in that order on their own. A transparent member's faces share one group with its opacity and blending mode, and its scopes group them further, unless a face of another member that overlaps them on the page lies between them in the order; only there is the member split. Faces overlap when the convex hulls of their outlines come within the 0.75 pt seam stroke of each other. Faces that paint nothing never split a member. Past 4,194,304 overlap tests on one group, each further face of such a member is drawn as a part of its own. Docs: docs/revolve.md.