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TOPIC: How to remove jitter from Carbon Plumage

How to remove jitter from Carbon Plumage 5 months 3 weeks ago #276

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Carbon Plumage in Houdini is very powerful and has / is being used successfully on many shows. But often when artists are setting up their first plumage they get jittering in the feathers. This jittering comes from over constraining situations, such as from collision vs welding or spring settings.

This is usually caused by:
  • Root Offset too small - the clue here is if there is jittering at the start of the sim then this may be the cause.
  • Welding Radius set too small and/or Welding Stiffness set too high. This is probably the most likely cause. We always recommend to leave a welding radius larger than what you think you need and control the attachment via the Welding Stiffness. This allows the feathers to slightly deviate from their welded shaft positions, which avoids over-constrained situations, and hence jittering.
  • Spring: If Swing Stiffness and Twist Stiffness are too high, it tries to prevent the mechanical part (rigid) from swinging and twisting, which leads to jittering situations. Think of it as trying to hold your arm out straight in front of you. Now, someone pushes your fist down. If they push hard, and you allow your arm to be pushed down, it looks quite natural, but if you fight it, it takes you a lot of strength and eventually your arm starts jittering as well, if neither wants to give in.

  • I am sure you will have looked at these tutorials in the Carbon documentation already - but just in case you haven't, check them out here or they should also be installed locally with the Carbon documentation

    Also there is another Carbon Support forum posting on jitter here as well, that may help.

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