Hey colleagues, 

Might be a dumb dumb question but it cost me a little bit longer time than 
I expected.

How to modify the size of a tire?

   - When I was trying the demo "demo_VEH_DeformableSoil.py", there was a 
   "Dlobal parameter for the tire", but the operation of changing the value 
   there only led to the starting position of the tire changed.
      - How to change the tire size here? I have noticed that there was a 
      ".obj" file used in the later codes of that demo but the file seems to be 
      more of a mesh generation stuff I guess? Is the tire size fixed by the 
      ".obj" file?
   - In another case, when playing HMMVV and citybus demos, I saw their 
   tire type is set by the function "SetTireType()" and details can be found 
   in CPP reference. So I thought this might be a ".json" settings, and I 
   changed the value of tire radius and width in "HMMVV_RigidTire.json" but 
   nothing happened.
      - What about this scenario? Is there a way to change tire size within 
      a vehicle system? (different from the former one using a single wheel)
   
Forgive me being stupid but I will be grateful if anyone can provide some 
suggestions.

Thanks, and all best,
Chen

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