This CPU sim and its GPU pixel drift apart over time: the double pendulum is chaotic, so the tiny rounding gap between them (GPU 32-bit + variable step vs. CPU 64-bit + fixed step) grows exponentially. That divergence is the chaos.

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WebGPU Not Available

Possible causes:

• Browser doesn't support WebGPU
• Accessing via HTTP (not HTTPS)
• Mobile device without WebGPU support
• GPU drivers need updating

Try:

• Use Chrome/Edge on desktop
• Access via localhost or HTTPS
• Enable WebGPU in browser flags