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Under a colored light, Inflate's facets were antialiased one by one. Where two facets met, their edge pixels added up to less than full coverage. The solid-color composite then showed its black channel backdrop there, so internal edges drew darker at 1:1, and the per-facet gradient art let the background through. - The solid-color composite draws, in each channel, an underlay of the facets with 2 pt round seams between the black backdrop and the facets themselves. - The per-facet routes put each run of consecutive faces of one surface over an underlay of its own faces, clipped to the union of the faces and their seams. Runs that carry a gradient's opacity mask are sealed with that mask. A face clip's footprint keeps only the outer contours of its seam stroke. - The paint-copy allowance for cut faces counts 12 copies per facet. At 1:1, inside the surface each color channel of an opaque fill is within 3 levels of the same art drawn at 3x and averaged down, and every pixel is opaque. Before, 2,267 channels differed by up to 10 levels on the solid Inflate, and 1,088 pixels of the gradient Inflate were below full alpha. Under white light, the rendered pixels, the SVG text, the PDF read back and the expanded art of Inflate, Extrude, Rotate and Revolve are the same as before. Docs: docs/three-d.md (Seams), docs/target-app-parity.md.