Hello,
Here is an update after a long time, I finally decided to make an online tool instead of a C4D plugin.
There is still a lot of things to do, but the main engine is ok and you can test it, the export to OBJ should work too.
Here is the very first "private" beta version :
https://code.vonc.fr/roadmaker
(the textures loading can be a bit long the first time)
I would be glad to have feedbacks, bug reports, ideas that you would like to add, UI suggestions, and if you want to contribuate with textures feel free to !