Simulations involving colliding objects are among the most difficult to set-up, and understanding the options available within SOFA is not straightforward, especially if you are taking your first steps with the framework. Probe-tissue-interaction provides reference simulations for modelling the interaction between a rigid and a soft object. The repository contains simulation scenes modelling the same exact scenario (1) using penalty forces, (2) using constraints and (3) prescribing surface displacement. Additional How-To for setting up scenes and tips are provided!