Select a stress scenario, compare solvers and timesteps, and export a report containing completion latency, recovery attempts, buffer budgets, compact contact workload and final poses. Sparse-contact, rotated-geometry and sustained-stack scenarios supplement the original fixtures. The diagnostic front projection reads GPU poses back to the CPU; these timings are not rendering benchmarks.

The Box3D comparison scenarios use the same authored inputs as the matched native CPU/WebGPU benchmark suite: box piles, mixed sizes, stacks, joint chains, rotating fast bars and ballistic motion. The live view is for diagnosis. The command-line runner measures fresh worlds without rendering and reports quality separately from performance; see the benchmark protocol.