mujoco_menagerie
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Want geom/hfield and wheels have friction effects, What should I do.
<geom type="hfield" hfield="a" size="50 50 0.01" material="grid"/>
<geom name="car1_front_wheel" pos=".08 0 -.015" type="sphere" size=".015" condim="1" priority="1"/>
copied code from demo, how to add friction to objects like these?