Put this together for an underwater show! The trick is to disable gravity and increase air density.

Here’s the gist of what’s going on.

  1. Dynamic Controls for tentacles
  2. Guide Control for the head
  3. Head constrained to motion path
  4. Wind to break up the motion a bit
  5. Visualiser to see the force
  6. Root tentacle animated, only the root
  7. High air density on the solver
  8. No Rotate Damping on rigids
  9. No gravity
  10. Low limit strength, to give it an elastic look

“Air Density” is just a multiplier for the Translate Damping and Rotate Damping attributes on each rigid. The .airDensity on the scene node is a multipler for all rigid air densities and a convenient way of making bulk changes.

The root tentacles have a set-driven-key to centralise their animation to a single attribute, which is on the guide control itself. The same node driven by the motion path.

For more details, have a look at the scene!