Fredp Ziva VFX is an offline simulator (it hasn't been designed as an interactive tool:
- it's not real-time
- it doesn't support skipping frames etc.)
The intended workflow would have an animator keyframe their motion on a typical animation "puppet" and then either save out their animation so that it could then be loaded onto a simulation ready rig that has been built with Ziva VFX.
(alternatively, this could be accomplished with referencing)
Does that make sense?