Parity — WGSL core vs TSL twin
Four horizontal bands (bottom→top): rayleighPhase, miePhaseCS, hgPhase, raySphereIntersectNearest. X sweeps the parameter (cosθ ∈ [−1,1] for phases; ray zenith for the sphere test).
Green = the function value (liveness + shape). Red = |WGSL − TSL| × 500. A correct port shows green gradients and zero red. The raw per-pixel diff is read back from a float target for a numeric verdict.
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