VCoasters

The mod provides a WYSIWYG track editor where a rider's path can be shaped and checked before anything reaches the world. A live simulation preview shows how a cart moves along the track, with train speed and acceleration diagrams and an angle sharpness guide to flag tight turns. Roll is supported, and cart rotation can be set independently of the track path. A rotation resolving algorithm handles how the cart turns through the layout.

Tracks are opened from the editor with a namespace and a track name, then saved with the provided buttons. Saved track data is written into vanilla command storage, and the first run of the save command suggests where that storage lives. The export section turns the finished track into a datapack that can be loaded into a world. Each track is generated as a datapack, and the current output does not yet include a pack.mcmeta file or ticking functions.

The mod is aimed mainly at roller coasters, though it can also lay out other vehicles, such as ships, moving platforms and camera paths. A server running it needs every connecting player to have it too. The code is under the MIT License and is open source, with a public source repository and issue tracker. Builds are published for 26.2 only.