Hi!
To create other cars, you'll have to add them to the project as a Tiled Background and then include them in the WorldObject family. To create an object it's as simple as creating it, setting a strip_id (indicating on which strip of the track it'll be created) and setting the relative_x (-1 represents the left edge of the track while +1 represents the right edge). The (x, y) position you create it a doesn't matter. For example, with a tree:
To make cars move, you can add to strip_iid. Another example with trees:
It's not smooth, but it's the simplest solution. The only problem is that you can run into a rendering glitch if you drive into the tree. A quick fix would be to change the following function in [M] Rendering:
