I would rather see this as a user suggestion which could be headed forward to the MFN authors. How you can see, there seems to be a definite desire for an appropriate option in the app beside other suggestions.
I also do wish a preset with a motorbike icon in the routes presets and made an appropriate suggestion. As a workaround, I took the car preset and set it up for motorbike use, but it is still marked by the car icon which is is at the same time irritating and annoying. I still don't understand why the authors so obstinately refuse to implement a motorbike icon, the new gui would have been the chance. Ok, it's still not ready, so I will wait in patience....
Good news. @tomas agreed that I can provide you tool to modify mf3d icons. I did myself a variant of GPS arrow which should work better on E-Ink display:
Could You give a short example how to convert obj files to mf3d`s with python on windows? Tried to run the script with IDLE, but get an error concerning IO-String:
Traceback (most recent call last): File "D:\Temp\obj2mf3d.py", line 2, in <module> import StringIO ModuleNotFoundError: No module named 'StringIO'
@2highlander - you would have to install python2.7 and the required modules then change the convert_models.sh to convert_models.bat and replace the unix commands with windows commands (e.g. cp -> copy)
@MacDony you should just add "triangulate faces" What I see from error is that your model does not have UV coordinates for texture (take a look inside convert_models.sh which texture are models paired)