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Volumetric atmospheres making hair caps "glow"

KaribouKaribou Posts: 1,325
in Technical Help (nuts n bolts)

I'm having issues with skullcaps appearing REALLY bright against the forehead when using volumetric atmospheres. When there is no volume (no translucent materials between the camera and the figure) the skullcap looks normal. However, when translucent fog is added, suddenly the skullcaps look super bright -- almost as though they are emitting light. This happens even when I turn the entire opacity of the cap to 0. I even tried applying the base 3Delight shader to the cap, just to make sure there wasn't a weird Iray setting I missed. I have two figures in the same scene and both figures are having this happen. Oddly, the volumetric atmosphere is also making the sclera and irises of the figures glow (which, lol, I kind of like!) There must be something going on with the skin settings, but I don't even know where to start. Help?

Comments

  • KaribouKaribou Posts: 1,325

    I found this thread: https://www.daz3d.com/forums/discussion/66042/iray-cutout-opacity-translucency-weight-weird-glow

    It does not make me optimistic. I see postwork in my future...

  • RodrijRodrij Posts: 158

    Something similar happens with Ghostlights except I get black spots. If you can get rid of any collisions ie where the hair and skin occupy the same space, you can probably resolve it. It is not the skin shader that is doing that, it is the invisible part of the hair colliding with the forehead which is messing with how the light bounces when rendering. In the case of this hair you can try visually looking at the collision If you change the view to smooth shaded, you can see the invisible part of the hair.

    One thing you can try is slecting the hair and increasing the scale. If you have meshgrabber you can try pulling the invisible forehead part out. Last thing I would try is adding a smoothing modifier to the hair and using upping the collision iterations.

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