Secondary Motion for Performed 2D Animation
summary
System augments layered 2D artwork with three physically inspired rigs — the follow rig, the rest pose rig and the collision rig — implemented on Box2D and exposed with a few tunable parameters (stretchiness k and follow strength). Authors curate 29 animations and label 86 instances of secondary motion (trailing, swaying, jiggling), build real-time online rigs plus offline rigging tools, and run a user study where participants quickly produce plausible secondary effects though some parameter naming and handle-creation UX issues remain.
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chapters (18)
- 0:00Introduction to secondary motion
- 1:10System input and goal
- 2:15Secondary motion categories
- 3:20Limitations of prior work
- 5:30Key contributions and approach
- 6:37Rig design properties
- 8:02Workflow and handle types
- 9:53Constrained dynamics framework
- 10:15Follow rig for trailing motion
- 11:25Rest pose rig for jiggling
- 12:30Rope-based rest pose rig
- 13:13Collision rig for interactions
- 14:20Combining multiple rigs
- 15:25Demo of rig applications
- 15:48User study and feedback
- 16:52Future work and improvements
- 17:36Conclusion and thanks
- 18:20Q&A session
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