[readSkel function](https://github.com/keenon/nimblephysics/blob/b20d7b571b895b51e401f077a66bd44d7ebf6557/dart/biomechanics/SubjectOnDisk.cpp#L631) sets gravity vector. However, it does not set body scales, which are needed for forward kinematics and my loss functions. Based on [Nimble wiki](https://nimblephysics.org/docs/working-with-addbiomechanics-data.html#nimblephysics.biomechanics.SubjectOnDisk.readSkel), readSkel is used for result visualization purposes, so scales should be included.
readSkel function sets gravity vector. However, it does not set body scales, which are needed for forward kinematics and my loss functions.
Based on Nimble wiki, readSkel is used for result visualization purposes, so scales should be included.