Secondary Dynamics?

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Old 11 November 2012   #1
Secondary Dynamics?

I have a challenge I'm trying to figure out. My dynamics experience in the past has been "Drop active rigid body onto passive rigid body and watch it bounce" ... this may be a little more complex than that, but hopefuly it isnt.

I have a stick that needs to fall and hit the floor, and do a little bounce, then on the second hit it needs to break apart into 5 smaller pieces (imagine a bamboo staff with each segment of the bamboo seperating on the second hit).

I can use rigid body dynamics for the hit of the overall staff, but when it breaks apart the pieces have to behave independently and potentially collide with one another.

Any ideas on the approach to follow? Thanks for reading!
 
Old 11 November 2012   #2
the exact setup depends on the solver you're working with, but here are two common approaches:
  1. intact stick drives pieces
    • sim intact stick
    • have pieces parented to it (disable collision w/ intact stick and don't sim yet)
    • start simulating pieces at time of second impact
    • animate visibility manually
  2. constrained setup
    • constrain all pieces together
    • at second impact disable constraints
The first setup is more complicated, but enables full control over the unbroken object.
The second setup is a little simpler and can offer dampened collisions, but the constraints might yield a little before breaking already
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Old 11 November 2012   #3
First, thank you for these ideas. I will try the first one when I get home.

I tried playing with the constraint setup, but all the constraints were very ... non rigid? They would wobble all over the place. I couldn't find a setting to constrict their movement ... otherwise that would be an ideal solution.
 
Old 11 November 2012   #4
I think instead of dynamic constraints, use a parent contraint so that the pre broken up stick so that it lines up with it exactly. The dynamics system on the pre broken up stick should be keyed to activate on the second bounce and at the same time animate the parent contraint off.
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Old 11 November 2012   #5
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