The mass of the ball is proportional to the cube of the ball radius.
| surface g | m/s2 | ||
| drag-coefficient | |||
| initial speed | m/s | Nballs | |
| ball radius_min | m | box width | m |
| ball radius_max | m | box width | m |
| box height | m | trail width | m |
| trail skip | steps | trail length | timesteps |
| time-step | ms |