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What a wonderful world
What a wonderful world
Comments: 5
archclan

19.03.2024, 06:42








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CARLOS FACE w SSS
CARLOS FACE w SSS

            

CARLOS FACE w SSS
Description: This is the last one, I promise. If we see Carlos again he will have some hair.

As Gat suggested, the sub-surface scatter (SSS) has a profound impact on the interaction between the skin and the light. The SSS in bryce is very crude I feel, it has some odd behaviors. It works very well for the ears and nostrils, allowing light to literaly penetrate the skin and come out the other side. It also has unexpected effects on the specularity. I think over-all it feels much more real.

The SSS is rigged using the trick of the transparent leaves. The secret is the "Black Nothjing" procedural that makes the SSS possible at all. This procedural along with normal shading creates the effect.
The SSS in bryce does not really know the difference between a leaf or a person's head. Refraction had to be pushed to max while transparent channel color and volume color had to be set to pure black. Even at these settings just enough SSS still occurs. The shadows cast by the model suffer though, they are noticably lighter than they should be when rendered in normal scenes that are not blackbox.

All tissues are rigged SSS, including the skin, lips, teeth whites of eyes, iris, gums, tongue, and inner mouth. The irises have taken on a cool sort of glow, I like it. I could lower the glow with lower diffussion.

Lit w/ 4 tan colored radiald w/ soft shadows, and livin'large.hdri for ambient lighting. Total render time 12 hours.

I have already received alot of feedback from the previous versions. I just wonder if the SSS makes a difference to you all as it does to me? There are more characters on the way soon. Thanks.
Added by: rashadcarter1
Keywords: rashadcarter1, bryce6.1, dazstudio, psp7
Date: 10.23.2007 16:48
Hits: 4222
Downloads: 84
Rating: 0.00 (0 Vote(s))
File size: 348.9 KB
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Author: Comment:
Horo
Admin

Join Date: 05.26.2004
Comments: 4721
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The difference of SSS on the skin is subtle but visible. Thank you for sharing your "secret" how you made it work in Bryce. The eyes have much improved and lost that hazey touch. The lips colour also improved and the teeth are still the weakest point. Good use of light, the hard shadows behind the ears have disappeared - though whe should see how it looks if the head is turned.

If you use your new insights and render Carlos in an environment (which you are able to make look natural), we would take it for a photograph. For me, still, it would only be given away as CG because of the teeth.
10.23.2007 18:07 Offline Horo h.-r.h.wernli at bluewin.ch https://www.horo.ch/
LitoNico
Member

Join Date: 05.07.2004
Comments: 242
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Your SSS works very well- the front of the face seems quite natural.

Some places will need more SSS- ears and lips, particularly, but I have no idea how well Bryce will accept UV maps (or if the 'black nothing' will work with them), so I think it's better to simply leave them be as far as SSS is concerned, and add a few very low-powered lights around those regions. The ears look a bit wooden, at this point, and I think some extra lighting would help.

May we see a side-by-side comparison of this image and the very same without the black nothing? That helped me, at least, to figure out quite what it did to the flowers.

Maybe some SSS on the teeth, too- might add a little more realism to them.
10.24.2007 03:39 Offline LitoNico LitoNico at aol.com
rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610
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Nice to read from you LitoNico. It's comforting to know that you still check out the scene here. Hopefully you might submit some work again, miss seeing work from you. Thanks for the feedback, and as always thanks to you too Horo, for your words mean the world to me.

The teeth have SSS, but they still don't look like I want them to. The tannish colored lights do not get along well with the teeth I find, the teeth look yellow if I'm not careful. The teeth are such a pain in the butt. The whites of the eyes are still not right to me either, the SSS may not have helped them afterall.

The bryce SSS is crude to say the least. I think it can do some cool things though I have only scratched the surface of it...no pun intended. I found out the hard way with 12 noon by the pool that the SSS can turn quite ambient like on me if I'm not careful with the light levels and material diffussion levels.

UV mapping the SSS sounds terrific. I can imagine instead of "black Nothing" using a greyscale photo image to assign the SSS values, lighter areas with more transparency while darker areas would have less, but I think the results might not be so good. Just like the leaves, this SSS is ultra light sensitive, almost too sensitive to put much confidence in. I'm still playing around with it. Pretty much any procedural will work to provide an SSS, but only "Black nothing" or something like it can provide "clean" spotless/streakless scattering, hence the "nothing" in the title. It's a bit fiddly as David would say. Yes, a side by side would be a good idea.

Thanks for the food for thought. More images to come.
Oh yes, in the future Carlos will get those crazy eyebrows plucked or shaped in some way, they are just too dense now. I don't think any real human has brows quite that thick.
10.24.2007 05:06 Offline rashadcarter1 rashadcarter1 at aol.com
richter
Member

Join Date: 04.15.2004
Comments: 1092
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Much improved, concerning the specularity and the overall bump. The eyes seem noticably better. Good thing that you desaturated a bit the lips. About the SSS hand-crafted feature - it worked impressive! The teeth (as stated above) are the minor thingy that give away the overall appearance. My only suggestion would be to use a gradient material on the teeth with grey-yellow nuance for the upper part near the gums and grey-white for the lower part. I've noticed that the bump-map on the lips could be very similar to a one applied to the teeth, even tighter the "gaps". So perhaps it is best to search for a procedural mat, which is as close to the lips as possible. As Horo I guess the next step is to place Carlos in a "real" environment and wait for him to tell us if he likes it livin' large :))
10.26.2007 23:59 Offline richter richter at cold-may.com
rashadcarter1
Admin

Join Date: 06.04.2006
Comments: 2610
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Thanks Richter. i agree that the SSS changes everything. I did not notice just how much the SSS has the tendancy to "bake" away the specularity. Right now this image looks as though there is almost no shine to his skin, the skin looks soft and all of that, but it does not shine at all, and it should shine at least a little for maximum realism. I say all of this to say that I must submit just one more of Carlos, but this time with hair and a near perfect balance of rendering forces. I should have it ready by Monday or Tuesday. I think the improvement will be a bit of a shock. We shall see.
10.27.2007 14:44 Offline rashadcarter1 rashadcarter1 at aol.com


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