Terrain parameters

[hiroaki2702]

Is your feature request related to a problem? Please describe.
I'd like to simulate much more realistic digging behavior.

Describe the solution you'd like
I'd like to modify and tune terrain parameters such as Young's modulus, Ratio of produced soil particles of different radius, viscosity, friction, etc.

Describe alternatives you've considered
A simple method for calculating soil reaction forces based on soil mechanics theory

Additional context