CGTalk - V-ray material question (paper shader)

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simpson

12-12-2005, 04:35 PM

Hello, i'm trying to do a paper shader.
the problem is when i place an omni inside my model (let's say a simple tube with 1 mm walls) the light doesn't go through as it would go through a simple peace of paper.
here's a photo of what i'd like to get:

http://img349.imageshack.us/img349/8581/41fb.th.jpg

full size img:

http://img349.imageshack.us/my.php?image=41fb.jpg

Media

12-12-2005, 04:51 PM

Hi.

The problem is that V-Ray doesnt know if you have got 1 mm of metal, concrete or tissuepaper. So it treats it as a 100% solid object until you create a material for it. What you need to have a look at is trancelusency or SSS (Sub Surface Scattering). You could even play around with the egzVrayWax Material from www.vray.info (http://www.vray.info)

simpson

12-12-2005, 04:58 PM

so i can even use a simple plane for my model ?
oh yeah, and could anyone tell me the IOR of a plain print paper sheet? coz i've been searching for it with no luck.

simpson

12-12-2005, 05:25 PM

best i got so far.

-> http://img466.imageshack.us/my.php?image=53vg1.jpg

but as you can see the render time was enormous, and the img was only 320x240

simpson

12-12-2005, 06:27 PM

another try:

the problem here is that the light areas are darker and the darker areas are white :/

http://img474.imageshack.us/my.php?image=63dh1.jpg

here are the material settings:

http://img474.imageshack.us/my.php?image=70kw.jpg

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12-12-2005, 06:27 PM

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