Hello,
this is the reference page for friction type
ePATCH,
eONE_DIRECTIONAL,
eTWO_DIRECTIONAL
default is ePatch so i assume Unity physics also uses it. But i think i need try the other ones for desired behavior. Is it possible to set these by hand in Unity?
ePatch is the fastest but less accurate friction model. Indeed, it’s almost impossible to have accurate friction with it. All you can do in Unity right now is trial & error with the different coefficients of friction until you get a somewhat acceptable behavior for most situations.
Here you can see the description of the different modes:
http://web.archive.org/web/20150420003808/http://docs.nvidia.com/gameworks/content/gameworkslibrary/physx/guide/Manual/Friction.html
(I don’t know why this part was removed from the PhysX docs in a recent update)
I’ve had already requested such feature some time ago…
Update: the Friction Type is now exposed in Unity 2018.3: Edit > Settings > Physics > Friction Type.