Scene
Ball sumo
Two to eight balls in a ring with a single spinning exit. Every collision makes the one that hit grow, space tightens, and being pushed out is elimination.
Open Ball sumo in the editor
Parameters
The same controls as the editor, with the same range. The default is what the example page uses.
| Parameter | Range | Default |
|---|---|---|
| Wrestlers | 2 – 8 | 3 |
| Gap | 20 – 120° | 55 |
| Angular speed | -4 – 4rad/s | 0.5 |
| Growth per collision | 0 – 0.12 | 0.03 |
| Initial speed | 1 – 20 | 7 |
| Gravity | 0 – 40 | 6 |
| Bounciness | 0 – 1 | 0.97 |
How it usually ends
Measured by the engine with the default configuration over a fixed sample of seeds. No number here is an estimate.
- Seeds in the sample
- 40
- Escapes
- 100%
- Settles
- 0%
- Times out
- 0%
- Collisions (median)
- 21.5
- Duration (median)
- 9.6 s
- Climax (median position)
- 24%
- The fraction of the video where event density peaks. Close to 100% means the best moment is at the end.
Seeds that end well
The five best in the sample by the same heuristic the editor's search uses. Each link opens exactly this variation.
- seed2316383score 73 out of 10063 collisions24.8 sescapeOpen seed 2316383 in the editor
- seed1897467score 55 out of 10053 collisions12.4 sescapeOpen seed 1897467 in the editor
- seed1688009score 53 out of 10038 collisions11.8 sescapeOpen seed 1688009 in the editor
- seed2525841score 51 out of 10020 collisions13.7 sescapeOpen seed 2525841 in the editor
- seed3049486score 51 out of 10024 collisions11.4 sescapeOpen seed 3049486 in the editor
Frequently asked questions
How do I make a Ball sumo video?
Open the scene in the editor, adjust the parameters, try a few seeds and export to MP4. Rendering happens in your browser and costs nothing.
Why does the same seed always give the same video?
The simulation is deterministic: fixed-step physics and seeded random numbers. The same seed with the same parameters reproduces the same video on any machine.
How long is a Ball sumo video?
The video ends when the scene ends. The median duration measured in the sample is in the outcomes section, and the seed search shows each candidate's duration before rendering.
Can I use the video on TikTok, YouTube and Instagram?
Yes. The export is a vertical video with audio, ready for Shorts, Reels and TikTok. On the free plan it carries a discreet watermark.
How do I pick a seed that ends well?
Use the editor's seed search: it simulates dozens of variations without drawing and ranks the ones with a late climax. The seeds on this page came from the same heuristic.
Make your own variation
Open the scene in the editor with one of the seeds above, or let the search find another.
Open Ball sumo in the editor