Hair stiffness attribute jitter

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  05 May 2012
Hair stiffness attribute jitter

Hi. Has anyone else experienced a weird issue where if you set the stiffness to anything but 0 on a bunch of hair curves, they start jittering pretty severely. If the stiffness is low, itís a few curves, if the stiffness is set to 1.0, then the hair completely flips out. Anybody else experience this or know how to control it?

Below is a video file of what Iím referring to. This is the default settings after I use the ďMake selected curves dynamicĒ command and set the stiffness to 1.0
Thanks for any help!
  05 May 2012
The bend stiffness has problems sometimes with curved rest shapes.
Note that for high bend resistance you need to increase the iterations value (stiffness > 1 will blow up). The more segments the higher the required iteration count. It looks like you have many more segments (curve cvs) than you need. Instead of resampling the curves you could lower the sample density on the follicles. If you don't need a curved rest shape then setting rest pose to "straight" on all the follicles will help. Also it generally helps to set "start direction" to "start curve base". If you still have instability on the curves damp and a little drag may help, although too much will make motion unnatural. Another option is to use a little startCurveAttract instead of stiffness.

NHair in Maya2013 does not have this issue. It is mostly the same as the old hair, but uses nucleus for dynamics, collisions and constraints.

Last edited by Duncan : 05 May 2012 at 11:17 PM.
  05 May 2012
Thanks for the reply, Duncan! Good to know stiffness doesn't like curved rest shapes. I'll use start curve attract instead
  05 May 2012
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