Forum: Poser - OFFICIAL


Subject: Non-Closeup Realism - using clay in shader tree

bagginsbill opened this issue on Sep 30, 2005 ยท 47 posts


face_off posted Sun, 02 October 2005 at 5:28 PM

Bagginsbill : Red shift in film....I agree - there is heaps of redshift (sss) in film - a lot more than in reallife. However that could be explained in that they use very bright studio lights - so lots of light going through peoples skin. That's why I though the "Incidence Effect" was such a great way to simulate it. The colorramp simply applied a redshift to everything, which could give which unrealistic effects. "should add red to shadows right?"....Mmmmm, no - that's not what I think. I agree if you - there should be more redshift in the mid-tones. Shadows and Specular should have no redshift. But you coloramp is adding red to the upper end. The reason a lot of my renders have red shadows is because I'm using th incidence effect from a main light at the camera - so parallel polys will have some red added - which matches most photo's taken with a flash....you'll never see a black shadow on skin, since the bright flashlight creates a lot of sss on those areas. I'm not sure I agree on your logic with the edge-blends. Light penetrates the skin the same way, regardless of the viewers perspective. SSS is red tinted light coming out of the skin from light entering somewhere else. The camera position doesn't impact the sss. It's happening regardless of the camera position. So to add camera position dependant nodes in there just doesn't sound right to me. See http://www.renderosity.com/viewed.ez?galleryid=1007361 - notice the sss is only on parts of her skin that are parallel to the main light (which is off to the right) - very noticeable on her right arm. And the shadows are still black. IMO, the skintones in this render are pretty close to a photo, and I'm just not sure you would get this with edge_blends. If I get time today I'll do a comparison render. Specular on the other hand IS camera dependent - so should have lots of edge_blends (I think there is 3 in the Realism Kit node setup). Max's photo - the right side of her hair is red because it's light coming from just left of the shadow into the shadow. This is excellent research - keep coming with it. Would be good to see some more renders using the clay technique using different lighting - 1 render isn't enough to really get a full assessment.

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Creator of OctaneRender for Poser
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