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Newbie question: Blotches on forehead after attaching hair

arne207arne207 Posts: 156
edited October 2018 in Technical Help (nuts n bolts)

Hey there,

this is probably a simple one: With some characters and some hairs I get blotches like this one - even with bundle pieces like in the picture (Leony character and Leony hair). Do I change this via the shaping tab or is there a way to avoid this altogether?

Cheers!

Post edited by arne207 on

Comments

  • rames44rames44 Posts: 332

    This is caused by interactions between the characters head and the skullcap that’s part of the hair. Annoying, yes.

    Two things:

    1. If your character is significantly away from x=0, z=0, shifting things so that it’s closer to 0,0 may help. IRay has some quirky issues as you move away from the origin. (I suspect it’s an underlying math precision problem.) Not usually visible for items that are far from the camera, but if the camera is off in the hinterlands, you get odd effects on things close to it.
    2. As you mention, you can play with the shaping. If you scale the skullcap smaller just a bit, the issue will probably go away.
  • arne207arne207 Posts: 156

    I'll try that, thanks a lot!

  • gederixgederix Posts: 390

    While in perspective view (or a camera if you dont mind moving it about), select the figures head, then center it in your viewport with the 'frame' icon. Then switch to the material tool, and select the hair's skullcap (either in the viewport directly or by selecting the hair with the surface tool then going to the surface tab and selecting the skullcap there, sometimes its hard to select teh skullcap through the hair. This is also a good trick for selecting hair in general as active pose and universal only let you select the head). It should display as a yellow highlighted cap on your figures skull. Zoom in, and when you swing your view around (using the top navigation icon) you should be able to see where the skullcap is clipping into the figures head. It is not always visible until you start moving your view around to see the head from different angles. Use the dials in the parameters for the hair to fix this, some hairs have something like 'expand all', others have actual adjustment dials (forehead in/out, temples in/out, etc). I find the fix is usually to expand the cap rather than shrink it, either way with the surface tool you can see the clipping and adjust it without much guesswork.

    Side note, if you try to frame something while using the surface tool it will often zoom wayyy out when framing, which is annoying, so active pose or universal tool for selecting and framing, surface tool for adjusting the skullcap clipping. 

  • kaotkblisskaotkbliss Posts: 2,914

    I've also been able to fix this by removing the pokethrough on the transparent areas. Smoothing modifier with exanding/scaling or deforms

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