Bouncing balls in a heptagon · kimi-k3
Show 20 numbered balls (1 to 20) dropping from the center of a heptagon that spins 360 degrees every 5 seconds. The balls are affected by gravity and friction, collide with each other, and bounce realistically off the rotating walls; show each ball's spin via the rotation of its number. Implement all collision detection yourself.
transcript · 4 messages
Show 20 numbered balls (1 to 20) dropping from the center of a heptagon that spins 360 degrees every 5 seconds. The balls are affected by gravity and friction, collide with each other, and bounce realistically off the rotating walls; show each ball's spin via the rotation of its number. Implement all collision detection yourself.
thinking
Write a canvas physics sim in index.html. Heptagon rotating at 2π/5 rad/s, 20 balls spawn at center, gravity, ball-ball collisions, ball-wall collisions with moving wall (contact velocity), rotation of number proportional to spin (angular velocity from friction/impulses). Implement everything manually. Write the file.
/workspace/index.html (8049 bytes)Successfully wrote 8049 bytes to /workspace/index.html
thinking
Done. Brief summary.
Created `/workspace/index.html` — a fully self-contained canvas simulation: - **Heptagon** rotating at exactly 2π/5 rad/s (360° per 5 s), with vertex markers to show rotation. - **20 numbered balls** spawning at the center, each with its own color. - **Hand-rolled physics**: gravity, air drag, and Coulomb friction; ball–ball impulse collisions with positional correction and restitution; wall collisions measured against the *moving* contact-point velocity of the rotating polygon (v = ω × r), so spinning walls realistically fling the balls. - **Spin visualization**: tangential friction impulses from wall/ball contacts change each ball's angular velocity, which rotates the drawn number (with gradual spin damping). - Fixed-timestep substeps (4×) for stable collisions, plus a click-to-reset. No external resources.
TAKE IT TO CODE
A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.
RUN
EVALUATION
Heptagon spins, 20 numbered balls fall and settle at bottom under gravity, but keyboard/mouse inputs don't change simulation state.
Vision grade · anthropic/claude-sonnet-5
MEASUREMENTS
Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.