AI-assisted disclosure: Codex assisted with the experiments, scripts and writing. Measurements below come from saved test runs, with failures and untested conditions retained. MuTracer 0.1.5 converted my small Houdini plant into a usable WebGPU path-traced image. Vertex colors survived, three instances retained distinct color tints, and two double-sided alpha-masked cards kept their cutout silhouettes. The WebGL attempt ended with a lost context and produced no completed image. That makes...