problem with SSS and light

freaks · Post by **freaks** » Wed Feb 06, 2008 1:12 pm

hello i try to illuminate a big transparent egg. I have some problems, SSS give me a black object and light illuminate the outside of the object instead of inside .
this is my blend file, i used blendigo to export igs file
http://www.noog.fr/forum/egg.blend
thank you for your advice

SimonLarsen · Post by **SimonLarsen** » Wed Feb 06, 2008 7:28 pm

Well, first of all, your mesh needs some thickness and correct normals.

Also, your egg's material, is a diffuse transmitter.
To make it transparent, it must be a specular material.

Your old SSS material is still in the blend, at the problems seems to be the high RGB-gain (the value below Absorp type).

100 i quite a lot.

I hope it helps you. ^^

aleksandera · Post by **aleksandera** » Wed Feb 06, 2008 9:36 pm

Yap, and than you'll maby get something like this:

Kram1032 · Post by **Kram1032** » Thu Feb 07, 2008 3:29 am

actually, it's interesting in both ways

aleksandera · Post by **aleksandera** » Thu Feb 07, 2008 3:44 am

freaks, I can send you the modified blend file back if you wish.

aleksandera · Post by **aleksandera** » Thu Feb 07, 2008 4:09 am

BTW why dont you use blended materials? The sss renders fer ever
and I see you have only one thread.
First one 5 hours
Second one 5 min
(Core duo Quad)

BbB · Post by **BbB** » Thu Feb 07, 2008 4:27 am

There's definitely no need for SSS to do this. Blend a phong and a diffuse transmitter with the same colours. It'll render in a fraction of the time and will look nicer.

aleksandera · Post by **aleksandera** » Thu Feb 07, 2008 4:49 am

Well yes. I did this in some way.
Hower here is the blend file. Hope it comes handy to someone.
:) :) :)

freaks · Post by **freaks** » Thu Feb 07, 2008 5:43 am

ouhaou !!!!! thank you !
but i changed the original object and tried a new version of the egg, but i thin i have problems with normals. What is the manipulation to correct this ?

http://www.noog.fr/forum/egg2.blend

aleksandera · Post by **aleksandera** » Thu Feb 07, 2008 7:15 am

Select all faces and press Ctrl - n, recalculate the verticles outside.

Regards

Aleksander

freaks · Post by **freaks** » Thu Feb 07, 2008 7:33 am

ok it's perfect ! thks

freaks · Post by **freaks** » Thu Feb 07, 2008 9:39 pm

i have another question about lighting
but in one case i have some interesting with light inside the object but outside it's too dark, and in another picture i have something good outside, but eggs are no more illuminated in this case
so how can i merge the two aspects ?

the two pictures

aleksandera · Post by **aleksandera** » Fri Feb 08, 2008 12:20 am

I think here helps nothing else than experimenting with diferent values on the lights-emitters that are inside the egs, and those which are iluminating the whole scene.

Keep it up!

Aleksander

problem with SSS and light

problem with SSS and light

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