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I have read the explanation of the parameters in the ForceVelocityCurve at https://simtk.org/api_docs/opensim/api_ ... Curve.html
apart from Vmax.
How and where is it defined?

How and where is it defined?

It's defined the same way as other properties, but it's in the Muscle class (inherited by every muscle): https://simtk.org/api_docs/opensim/api_ ... 461669e7ee.

Thanks very much for the quick reply.
So it is the same for all muscles? Sorry if I am not expert: could you help me get the value in openSim ?

So it is the same for all muscles? Sorry if I am not expert: could you help me get the value in openSim ?

It's a property of each muscle, which means that the user can set the value. The default value is set on line 152 of Muscle.cpp here: https://github.com/opensim-org/opensim- ... e.cpp#L152 (specifically, it's 10.0 optimal-fiber-lengths per second). For example, a muscle whose optimal fiber length is 0.2 m will be able to generate nonzero active force up to a shortening velocity of 2 m/s.