THIS FORUM IS NO LONGER ACTIVE. PLEASE POST ANY NEW QUESTIONS OR DISCUSSION ON:
https://discourse.mcneel.com/c/grasshopper/kangaroo
The discussions here are preserved for reference, but new questions posted here are likely to go unanswered.
Kangaroo is a Live Physics engine for interactive simulation, optimization and form-finding directly within Grasshopper.
David Stasiuk
The problem is that your anchor points don't line up with your mesh vertices...all anchor points need to line up with the geometry/springs/forces you're using, otherwise there's nothing for them to anchor.
Feb 7, 2012