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ArtZone Heading
"Alice in Wonderland"
Added on: Mon Aug 06 2001
Page: 1 2 3 5 6 

Many materials in reality are translucent, skin is one such material. When light hits a piece of skin some of it will bounce strait off, while some of it will enter the skin, bounce around a few times then come out again.
An example of this phenomenon would be the red light that shines through your hand, ear, nose, cheek, etc. when you hold a torch to it.

While current software has no means of accurately reproducing this phenomenon, I have come up with a simplistic means of faking it. I gave the Mad Hatterís skin a raytraced material as this gives many more options including fluorescence, which can make skin appear slightly more realistic.

I used a falloff map in the extra lighting slot (self illumination slot for standard materials), and set the falloff type to "shadow/light". I made one of the falloff colours red and the other black such that the shadow side of the object has a red glow and the lit side is as normal. I still wanted the darkest parts of the object to be completely in shadow, so I modified the mix curve graph as shown below



This gives the object a soft red glow; however, we donít want this one object to appear more highly illuminated than the other objects in the scene, so we turn down the RGB offset and RGB level a bit in the output rollout. Also, the glow should be very subtle, so I turned the amount of extra lighting down to about 25% in the maps rollout. Below is the texture, shown with extra lighting turned up to illustrate to effect, and turned down as it is in the final rendering.





 
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