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Compares the software tessellator's positions, normals, UVs and colors against a longhand double-precision reference (Bernstein polynomials, Cox-de Boor with clamped knots, finite-difference normals), across Bezier and spline surfaces, edge types, poles and patch facing, so it can be optimized with something independent to be wrong against. Also reports vertices per second. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>