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I have a short animation of an egg shape (solid w/o liquid) and the egg is on a conveyor belt (follows directional movement of belt via driver) then was supposed to have the egg get smashed by a large fist.

I've successfully gotten the egg to follow the track but I can't figure out how to use something like cell fracture without being able to follow the track and stay in one piece.

I wanted the egg shape to be able to collide and fall apart with the fist. Fist and belt are both passive.

Here's a link to what I have so far for the blend file.

Any help would be greatly appreciated, thanks.

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  • $\begingroup$ Have you solved this yet? I use the explode modifier in cases like this $\endgroup$
    – Edgel3D
    Jan 12, 2019 at 1:14

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I have solved this with the help of the Fracture Modifier Build of blender. You can find more info and download it here:

http://graphicall.org/1148

I also included the steps in a text file inside the modified blend. Open this blend only in the Fracture Modifier Build or you may experience crashes and data loss in the blend.

Steps to reproduce:

  • delete the cell fracture objects
  • put fracture modifier on original egg, 250 shards, execute fracture
  • egg becomes convexhull, active, animated, triggered
  • fist becomes convexhull, active, animated, trigger
  • belt becomes passive animated, mesh, final, deforming (so it can move the egg shards too)
  • scene / rigidbodyworld: enable split impulse (less velocity on shards on on fist impact, basically) and steps per second to 600 (so shards dont fall so much thru the belt)
  • optionally: in FM enable Fracture Utilties -> Fix Normals and refracture with Execute fracture, set Autohide distance to 0.001 and automerge distance to 0.1 and enable perform merge, to hide the cracks in the smoothed egg shell
  • optionally: add edgesplit and subsurf for a nicer looking egg surface
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