[ODE] Heightfield2

[LR]

Hi,
 
I have a curious thing with the heigtfield: 
 
A robot with 2 cylinders as whells is running on a flat (it's a test)
heightfield : the robot jumps (shortly, about 10 cm on Z up axis) when
cylinders are about to go from a sub square to another.
 
Reducing the number of square, i can look that it's exactly at the height
squares transition.
 
In fact robot own 2 cylinders as front wheels, and a shpere for the rear.
Jumps occurs only on the cylinder witch is about to go from a quare to the
next .... never on the sphere
 
some one know what to do to avoid that ?
 
thank you
 
Laurent.
 
 
 
 
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