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View Full Version : bigMuh's Diffusion with bumps?


Stahlberg
08-12-2004, 06:35 AM
Anybody have any ideas on how to get bump maps working properly with the Diffusion shader?

It doesn't really work to just put the bump on the Surface shader connected to the Diffusion, or the shader which has the Diffusion in its incandescent or ambient channel. That simply more or less creates a simple mix of the bumps with the flat Diffusion layer.
The flat parts will have a stronger Diffuse color (red in the case of skin), and the bumps will have less (making them look grey, and the whole effect is that of some kind of flesh-colored concrete).

Pixero
08-12-2004, 09:16 AM
Hi!

Is this what youīre after? With the bumps beeing slightly lighter than the rest?

http://w1.702.comhem.se/~u70208061/bilder/pics/skin3.jpg

Itīs not a "perfect skin shader" but could maybe be tweaked into something useful. :rolleyes:

I connected the bumptexture through a reverse -> set range (with max set to 0.1)
-> luminance -> Diffusion parameter of the Diffusion shader.
Then used a transparent Blinn for bump and a Phong E with high Roughness.
All connected to a mix8layer with Diffusion as base material and the others with Add as blendmode.

http://w1.702.comhem.se/~u70208061/bilder/pics/skin2.jpg

Here I have rendered them separatly as well.
The effect is a bit strong just to make it more visible.

http://w1.702.comhem.se/~u70208061/bilder/pics/skin1.jpg

Stahlberg
08-12-2004, 11:05 AM
Hm, into the Diffusion attribute, huh?... smart... very nice closeup skin... let me try that... :)

Osaires
08-12-2004, 12:23 PM
wov that look realy nice. i'm trying to copy your shader network

pierre
08-12-2004, 04:16 PM
Yeah, interesting shaders Network !

Pixero
08-12-2004, 07:50 PM
Iīve upped the scene file for those who wish to study it.
Itīs in the tutorial section of my site along with a short tutorial. :)

www.sandstrom.on.to (http://www.sandstrom.on.to)

Osaires
08-13-2004, 11:28 AM
Thank you very much.

Any reason why you use a transparent bilnn insted of the bump combiner?

CIM
08-13-2004, 12:19 PM
Thank you very much.

Any reason why you use a transparent bilnn insted of the bump combiner?

Looks like he's using the transparent Blinn to add some specular highlights.

Dr. Ira Kane
08-13-2004, 03:28 PM
Thanks Pixero for putting it all together, looks like a very nice skin shader, at least great base to start play with.

Pixero
08-13-2004, 05:46 PM
Yeah, see it as a starting point and keep contributing your findings for the ultimate skin shader... :)

kryoboy
08-20-2004, 09:36 AM
pixero nice work, intresting approach. So many diffrent techniques.. i like this one. hmm :love:

lol!

benvan
04-03-2005, 02:59 PM
For some reason i cant render that scene you uploaded - i have all of the plugins but nothing will render! (the render window just shows the last rendered image)

Any ideas?
Thanks

bluemagicuk
04-03-2005, 11:22 PM
For some reason i cant render that scene you uploaded - i have all of the plugins but nothing will render! (the render window just shows the last rendered image)

Any ideas?
Thanks
Do you get any error messages ?

tom_c
04-04-2005, 01:29 AM
I forget how you do it now, but you can use Francesca's BumpCombiner to use bump maps with any mental ray shader...

Ill try and remember how you set it up when Ive got this render done...

:-)
tall the best,
Tom

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