ReadonlymaterialThe derived material — a §60 NodeMaterial whose graph evaluates the
pair's paints per fragment. Owned by the shape that asked; a new plan
replaces it wholesale.
ReadonlyselectorWhether the two halves draw different paints, so the geometry must bake
the selector colour stream ((0,0,0,0) fill, (1,1,1,1) stroke) the
graph's mix reads. false when one half is absent or both name the
same paint value — the geometry then carries no colour stream at all.
What a registered paint lowering answers for one fill/stroke pair — the derived §60 material and whether the geometry must carry the fill/stroke selector stream (see ShapePaintSupport.plan).