Enhance Artisynth Script with Fixed Points

I need a modification to an existing script used in the Artisynth simulation software. The script currently simulates mechanical systems and needs fixed points added.

Requirements:
- Add fixed points to the simulation
- Fixed points should be identifiable by specific criteria or conditions

Ideal Skills and Experience:
- Expertise in Artisynth
- Strong background in mechanical system simulations
- Proficiency in scripting and condition-based modifications