You've got the concept correct ;)
The misunderstanding is probably thanks to the FDir1 demo, it's no longer included with JV-ODE for this reason (after our previous discussions on the subject). In the demo, the friction direction was manually adjusted in order to experiment with the effects of FDir1, but the main purpose of the demo was to show how to setup FDir1 in code. I realised it was too misleading and decided to scrap it a while ago.
So, everything you've posted is correct, you do need to adjust the friction direction to align with the wheels for it to work like real tyres.
To adjust these values in real time, they must be applied with the Geom contact functions only... dGeomContactSetMode(geom,mode)... dGeomContactSetFDir1(geom,fdir1x#,fdir1y#,fdir1z#) etc
Same applies to the slip values.
Using the geom functions should resolve those issues, let me know if it still isn't working correctly.
The most important part of the ODE docs regarding this problem is this bit...
To model this in ODE set the tire-road contact parameters as follows: set friction direction 1 in the direction that the tire is rolling in, and set the FDS slip coefficient in friction direction 2 to k*v, where v is the tire rolling velocity and k is a tire parameter that you can chose based on experimentation.
Nice pics btw :)
The misunderstanding is probably thanks to the FDir1 demo, it's no longer included with JV-ODE for this reason (after our previous discussions on the subject). In the demo, the friction direction was manually adjusted in order to experiment with the effects of FDir1, but the main purpose of the demo was to show how to setup FDir1 in code. I realised it was too misleading and decided to scrap it a while ago.
So, everything you've posted is correct, you do need to adjust the friction direction to align with the wheels for it to work like real tyres.
To adjust these values in real time, they must be applied with the Geom contact functions only... dGeomContactSetMode(geom,mode)... dGeomContactSetFDir1(geom,fdir1x#,fdir1y#,fdir1z#) etc
Same applies to the slip values.
Using the geom functions should resolve those issues, let me know if it still isn't working correctly.
The most important part of the ODE docs regarding this problem is this bit...
To model this in ODE set the tire-road contact parameters as follows: set friction direction 1 in the direction that the tire is rolling in, and set the FDS slip coefficient in friction direction 2 to k*v, where v is the tire rolling velocity and k is a tire parameter that you can chose based on experimentation.
Nice pics btw :)