Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Tutorials & Guides => Topic started by: tiagodmed on 2014-03-22, 06:03:40

Title: Study tests with absorption and translucency (A6)
Post by: tiagodmed on 2014-03-22, 06:03:40: Tests with Absorption, translucency, translucency+Absorption and translucency+Absorption+refraction with glossiness

3ds Max file (2014 corona alpha 6): https://dl.dropboxusercontent.com/u/2067306/corona_material/absorption_translucency.max

Translucency:
(https://dl.dropboxusercontent.com/u/2067306/corona_material/translucency-01.JPG)

(https://dl.dropboxusercontent.com/u/2067306/corona_material/translucency-02.JPG)

(https://dl.dropboxusercontent.com/u/2067306/corona_material/translucency-03.JPG)

Absorption:
(https://dl.dropboxusercontent.com/u/2067306/corona_material/absorption_refractionGlossiness-01.JPG)

(https://dl.dropboxusercontent.com/u/2067306/corona_material/absorption_refractionGlossiness-02.JPG)

Translucency+Absorption:
(https://dl.dropboxusercontent.com/u/2067306/corona_material/translucency_absorption-01.JPG)

(https://dl.dropboxusercontent.com/u/2067306/corona_material/translucency_absorption-02.JPG)

(https://dl.dropboxusercontent.com/u/2067306/corona_material/translucency_absorption-03.JPG)

Translucency+Absorption+Refraction:
(https://dl.dropboxusercontent.com/u/2067306/corona_material/absorption_refractionGlossiness_translucency-01.JPG)

(https://dl.dropboxusercontent.com/u/2067306/corona_material/absorption_refractionGlossiness_translucency-02.JPG)

Example of practical application:
(https://dl.dropboxusercontent.com/u/2067306/Tunel_A6_01.jpg)
Title: Re: Study tests with absorption and translucency (A6)
Post by: Paradox2013 on 2014-03-22, 09:06:55: Thank you! Very cool!
P.S I'm from Russia, so my English is very bad! : D
Title: Re: Study tests with absorption and translucency (A6)
Post by: borisquezadaa on 2014-03-22, 20:02:50: Thanks!... i was struggling with this from some time now.

Now i get it.
Title: Re: Study tests with absorption and translucency (A6)
Post by: klipanos on 2014-03-22, 21:59:54: Very nice Thank's!!
Title: Re: Study tests with absorption and translucency (A6)
Post by: rozumny on 2014-03-24, 14:30:21: Can you please show the settings of the greenery material on the beautiful picture with trees?
How did you make it shine so nicely with the sun on the background?
Title: Re: Study tests with absorption and translucency (A6)
Post by: nerofaora on 2014-03-24, 21:42:30: i wonder if translucency can be a substitute for sub surface scattering
Title: Re: Study tests with absorption and translucency (A6)
Post by: tiagodmed on 2014-03-25, 01:08:45: Quote from: rozumny on 2014-03-24, 14:30:21
Can you please show the settings of the greenery material on the beautiful picture with trees?
How did you make it shine so nicely with the sun on the background?

There is no secret in the materials or in the light.
I used only one corona sun with corona sky, and for materials of leaves only translucency. The trick to have variation is to use a texture in channel translucency.
The value of "Fraction" I was increasing until you reach the result I liked, this value varies according to the type of leaf.

(https://dl.dropboxusercontent.com/u/2067306/corona_material/Capturar.JPG)

Quote from: nerofaora on 2014-03-24, 21:42:30
i wonder if translucency can be a substitute for sub surface scattering

Yes you can, depending on your need you can use any of the 4 above combinations (Absorption, translucency, translucency+Absorption and translucency+Absorption+refraction with glossiness). As the final result depends on many factors, in each case you will need to do many tests until you reach the optimal setting.

Another example are these lego bricks, where I used a bit of translucency to achieve an effect of SSS: http://forum.corona-renderer.com/index.php/topic,3218.0.html (http://forum.corona-renderer.com/index.php/topic,3218.0.html)

(https://dl.dropboxusercontent.com/u/2067306/Lego_Bricks_triadeStudio.jpg)
Title: Re: Study tests with absorption and translucency (A6)
Post by: tiagodmed on 2014-03-25, 02:00:53: A very fast test to make a fake SSS:

(https://dl.dropboxusercontent.com/u/2067306/corona_material/fake_sss.JPG)
Title: Re: Study tests with absorption and translucency (A6)
Post by: rozumny on 2014-03-25, 09:54:32: tiagodmed! thanks a lot for the explanation and the material itself!!! we are doing a few garden scenes, so it will be very helpful!!
Title: Re: Study tests with absorption and translucency (A6)
Post by: maru on 2014-03-25, 10:05:24: About the last test with face: would it work different with no refraction?
Title: Re: Study tests with absorption and translucency (A6)
Post by: tiagodmed on 2014-03-26, 15:28:55: Yes you can just use translucency. But in the same way that an SSS shader work best using maps to delineate the effect with fake techniques it is more necessary.
Title: Re: Study tests with absorption and translucency (A6)
Post by: Polymax on 2014-03-26, 22:25:20: long time ago discovered this fake...maybe in the summer 2013 :)
Title: Re: Study tests with absorption and translucency (A6)
Post by: tiagodmed on 2014-03-27, 01:03:00: Quote from: Polymax on 2014-03-26, 22:25:20
long time ago discovered this fake...maybe in the summer 2013 :)

Great example of fake sss with refraction + absorption
Title: Re: Study tests with absorption and translucency (A6)
Post by: CGHOT on 2014-04-15, 14:01:45: Very nice Thank's!!