flutter3d_game_racing

A car, a road that is a curve rather than a floor, and a lap that only counts when it was driven all the way round.

What is genuinely new here

The other two genres stand on geometry: a floor is a box in the collision world and a body is swept against it. A racing surface is not geometry. A circuit is a measured curve with a width, a camber and a shoulder, and where a car is on the road is worked out from the curve rather than swept against it — see TrackSpline and TrackField. Everything that is really an object — a barrier, a wall, the scenery — stays in the collision world exactly as before.

That is what makes the road cheap enough to be a kilometre long, and it is what makes a lap something the game knows about rather than something it infers.

Nothing here draws

No flutter3d, no flutter_gpu, and the reason is not tidiness: the things that go wrong in a racing game go wrong invisibly. A car that understeers differently at a lower frame rate. A lap counted twice because the line was crossed twice in one step. A driving line the AI cuts through a barrier. A position table that disagrees with itself on a circuit that crosses over itself. None of those appear in a screenshot and all of them are reachable from a plain test.

What is in it

A note on the ghost

It was written, tested and called by nothing for as long as this package existed. The application now records a lap, keeps it and draws it — and the engine half of it (Pose, Tape, Recorder, Playback) has moved down to flutter3d_game, because a place, a facing and an up have nothing to do with racing. What stayed here is the vehicle it is read off and the shape of the file it is written to: lapTime is a word the layer below is not allowed to say.

Part of flutter3d, an independent implementation of a 3D engine for Flutter — not a fork or a binding of another engine, and not affiliated with the Flutter team. Three switchable rendering backends: Impeller via Flutter GPU, WebGL2, and a software rasteriser. glTF, OBJ and .f3d loading, six lighting models, shadows, bloom, skinning, animation, BVH culling and picking; a deterministic fixed-step game layer with collision, navigation, positional audio, and gamepad and touch input. Three example games — shooter, platformer, racing — each built on its genre package: flutter3d_game_shooter, flutter3d_game_platformer, flutter3d_game_racing. A new game starts from the editor's scaffold, which writes one from a template: flutter3d.pleion.dev/first-project/. Documentation: flutter3d.pleion.dev.