tutorials:advanced

Advanced Examples

About

This tutorial demonstrates various advanced uses of SCONE.

In addition to control parameters, it is also possible to directly optimize some properties of the model itself. Examples of variables that can be optimized are:

  • The max_isometric_force of a muscle
  • Location offset or radius of contact geometry
  • Stiffness and damping of a CoordinateLimitForce

Properties can be set either directly, via an offset, or by multiplying them by a specific factor. Values can be defined via a special Properties section inside the OpenSimModel section:

OpenSimModel {
	model_file = data/Human0914.osim
	
	Properties {
		# increase left iliopsoas force by factor 2
		iliopsoas_l { max_isometric_force.factor = 2 }
		
		# optimize y position of contact geometry and reuse parameter for left side
		r_toe { location.offset { x = 0.02~0.01<-1,1> y = 0 z = 0 } } 
		l_toe { location.offset { x = r_toe.location.offset.x y = -0.005 z = 0 } }
				
		# optimize knee limit stiffness and damping and reuse parameters for left side
		KneeLimit_r { upper_stiffness = 1~0.01<0.1,5> damping = 0.1~0.01<0.01,1> } 
		KneeLimit_l { upper_stiffness = KneeLimit_r.upper_stiffness damping = KneeLimit_r.damping } 
	}
}