What is special material relationships?

[yanboli]

I am simulation vehicle tire on the ground without special treatment. I notice significant tire slippage especially on slopes. I need absolute Zero slippage. Is there a way to achieve it?

KineticFriction: "Get of set the friction coefficient ... and no special material relationship is defined between the colliding objects "

This sounds interesting. So, what is "special material relationship"

[RossNordby]

The material for a pair of entities is computed by the MaterialManager.GetInteractionProperties: https://github.com/bepu/bepuphysics1/blob/master/BEPUphysics/Materials/MaterialManager.cs#L52

It first examines the MaterialInteractions dictionary to see if the relationship is explicitly defined. If not, it uses the MaterialBlender callback. So you could either specify the desired material interaction behavior in the dictionary, or supply a custom callback.