We had the pleasure to work with friends at Voxels to produce CG-Animals rigs with Muscles , Using 3dsMax without any external or extra plug-ins.....The solution was to create scripts that helps in :
1-Creating animation Puppets .
2-Creating Muscle rigs .
3-Cache the muscle dynamic animation .
4-carrying out Cloth simulations over muscles to mimic fascia behaviours.
5-delivering cached meshes .