[Fernando Tella]

Hi there!

I've made some preview scenes to check attenuation distance and want to share them with you. I hope they are useful for somebody.

Here is the link for the zip file which includes 4 scenes and a jpg:

http://www.ftella.com/links/Attenuation%20preview.zip

All the files should be unzipped in the preview folder inside Maxwell one.
There are four scenes: one for attenuation distances from 10m to 1m, another one from 10dm to 1dm, another one from 10cm to 1cm and the last one from 10mm to 1mm.

The geometry is something like this but from a front view (nearly):



In the preview window should look like this:



The red line shows the profile of the piece crossing eleven lines which represents one unit each from 0 to 10.

Suggestions and critics are welcome. Of course you can modify the scene and do what ever you want with it.

Enjoy!

Cheers!

[tom]

Cool, my first suggestion is setting Nd=1 and speeding this scene up

[sandykoufax]

Thanks a lot.

[thxraph]

nice one, thank you Fernando!

thxraph

[Fernando Tella]

Cool, my first suggestion is setting Nd=1 and speeding this scene up

With setting Nd=1 you mean when making the test, don't you?

Anyway I think I could make them a bit less heavy changing the background. I'll update the link if I change it.

[Fernando Tella]

Updated the link. Changed the background and changed the images. I think it's faster now.

[tokiop]

Thanks Fernando! A preview scene like this is really a must-have to understand SSS!

Maybe an emeter to test how the mat reacts to back-light would be usefull since SSS is often used for that purpouse! I'll test when time/use!

Thanks again!!

[tom]

With setting Nd=1 you mean when making the test, don't you?

From what I see, you've made a typical glass for testing attenuation. Rendering glass objects brings calculation of total internal reflections, refraction and caustics. Naturally, these take time. For testing attenuation, you don't need it to be a glass. So you can simply set Nd=1 and the attenuation coloring will remain but you'll save more time when rendering. It was just a suggestion, nothing wrong with what you do.

[tokiop]

I just tested the scene with backlight-emitters, i can get the material to chane whatever the SSS settings, only roughness does change it's apperance.. I'll do more tests later, SSS's really tricky!

[Fernando Tella]

I've tryed to modify the preview scenes for SSS.

This is what I got:

http://www.ftella.com/links/sss%20preview.zip

The previews should look like this:



Some things to take into account:

1.- I have changed the background into a banded mxi; I had to reduce its intensity as the scale goes smaller for the scene not to be overblown by the emitter intensity and lose the color of the material. So you are not testing the different scenes with the same light intensity. Anyway I think it's still good to set absorption and scattering.

2.- Remember to set the render system to 1. RS0 does not work ok with sss.

3.- Put everything inside the zip into Maxwell/preview/ folder.

4.- Enjoy.

[def4d]

Really thanks Fernando, very usefull!

[Fernando Tella]

Welcome!

[Tea_Bag]

The scene for the preset materials for SSS in the manual would be good to use as a preview? SSS is clearly visible in that scene! Can we have it NL?

Anybody else think this scene is suitable for a sss preview scene?