You can also find community-made physics props on the Reallusion Marketplace . Physics Toolbox - iClone Plug-in - Reallusion

It uses the Bullet Engine to perform real-time simulations, saving hours compared to manual animation.

While there isn't a single official "iSoft Physics" zip file, (often abbreviated or searched as "iSoft") is a core feature of the Reallusion iClone ecosystem. It allows animators to simulate realistic material deformations like flowing hair, flapping cloth, and bouncing soft objects without manual keyframing.