I'm trying to do hair in cycles and everything is fine until I render.

Before: enter image description here

But After a render: enter image description here
The hair goes wild

I tried raising the hair off the scalp but it still goes wild, no idea what settings triggered this.

  • $\begingroup$ If you can post a .blend, that would be your best chance for figuring this out. $\endgroup$ – Mike Metcalf Sep 14 '15 at 16:20
  • $\begingroup$ mediafire.com/download/q6czsqpkwkmffjx/Hairtest.blend $\endgroup$ – Laeh Tana Sep 14 '15 at 17:16
  • $\begingroup$ I've downloaded your blend... checking it out now. $\endgroup$ – Mike Metcalf Sep 15 '15 at 17:11
  • $\begingroup$ Well, I messed with the blend a bit. It was bringing my work system to its knees, so I waited and tried it on my home machine. Took a long time to setup the BVH and finally start rendering, and then it crashed during render. $\endgroup$ – Mike Metcalf Sep 16 '15 at 1:34
  • $\begingroup$ I turned down the sampling and finally got a render, and verified that my output matched yours (after the render the hair was all skeewompus). I went to the particles tab and clicked the 'Free Bake' button on your hair system, and then rebaked (took quite a while). After that the render looked much better. Try rebaking and see what you get. $\endgroup$ – Mike Metcalf Sep 16 '15 at 1:36

Try re-baking your particle cache. You may need to click 'free bake' first before 'bake' will become available. enter image description here

  • $\begingroup$ I also found my subsurf modifier made the hair wonky too. $\endgroup$ – Laeh Tana Sep 16 '15 at 3:26
  • $\begingroup$ @Laeh Tana So, are you back on track? Is the hair behaving properly? $\endgroup$ – Mike Metcalf Sep 16 '15 at 4:14

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