it's a script i made for constructing vehicles in trenchbroom and use them in my game in godot engine. you can see its demo all over the page (i hope the videos are loading properly).
not released anywhere yet!! this page will be updated if/when i post the code on github. i'd need to isolate the code from my game project, so it can be uploaded separately.
create vehicle geometry in trenchbroom normally, like you'd make maps in tb
create wheel geometry anywhere in the same .map file
add a pivot for the script to align the wheel model along it
drag&drop wheels