Scene
Lane duel
A vertical track split down the middle: two balls, one per lane, never touching. The lanes get the same rows, each with its own draw, and the camera follows whoever is ahead.
Open Lane duel 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 |
|---|---|---|
| Track length | 20 – 200u | 60 |
| Obstacle density | 0.4 – 2 | 1 |
| Gravity | 1 – 40 | 14 |
| Bounciness | 0 – 1 | 0.55 |
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
- 60%
- Settles
- 8%
- Times out
- 33%
- Collisions (median)
- 114
- Duration (median)
- 23.7 s
- Climax (median position)
- 23%
- 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.
- seed3992047score 79 out of 100123 collisions21.7 sescapeOpen seed 3992047 in the editor
- seed1897467score 72 out of 100129 collisions22.2 sescapeOpen seed 1897467 in the editor
- seed3782589score 72 out of 100112 collisions23.3 sescapeOpen seed 3782589 in the editor
- seed3363673score 71 out of 10095 collisions19.1 sescapeOpen seed 3363673 in the editor
- seed2002196score 71 out of 100119 collisions24 sescapeOpen seed 2002196 in the editor
Frequently asked questions
How do I make a Lane duel 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 Lane duel 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 Lane duel in the editor