Material Help.

Originalplan® · Post by **Originalplan®** » Thu Mar 03, 2016 5:06 am

Hey guys,need a bit of help.
How do i create a material which looks like a CD bottom??
Is that even possible?

thesquirell · Post by **thesquirell** » Thu Mar 03, 2016 6:29 am

Long ago, there was this thread:

http://www.indigorenderer.com/forum/vie ... 37&t=10581

Never tried to pull it out, though.

Post by **Oscar J** » Thu Mar 03, 2016 6:33 am

The colourful look comes from interference, which Indigo supports using the coating material type.

http://www.indigorenderer.com/forum/vie ... =7&t=12036
http://www.indigorenderer.com/forum/vie ... =7&t=12036
http://www.indigorenderer.com/documenta ... es/coating

I would try a very high resolution radial bump map, something like this or ideally even more high res...:
http://evermotion.org:8080/exclusiv/ani ... eflect.jpg

... to control the thickness of the coating with.

Edit: Nope, that doesn't work.

Post by **Oscar J** » Thu Mar 03, 2016 7:18 am

... actually one can sort of make it look like a CD. This is not accurate though.

Originalplan® · Post by **Originalplan®** » Thu Mar 03, 2016 7:49 am

Thanks @thesquirell @ Oscar !
Much appreciated!

I was thinking maybe use this > http://www.indigorenderer.com/materials/materials/1055 with on big ring.
With a super high exponent inside a plastic material...so light can bounce and break.
But no luck.

Post by **Oscar J** » Thu Mar 03, 2016 8:05 am

Try using this map I made as coating thickness with interference on. You need to play around with the values inside Indigo a bit though.

galinette · Post by **galinette** » Thu Mar 03, 2016 9:27 pm

Oscar J wrote:The colourful look comes from interference, which Indigo supports using the coating material type.

No, it comes from grating diffraction, which ends up in highly dispersive, highly anisotropic BRDF behavior. This is absolutely not supported, it has to be faked somehow.

Post by **Oscar J** » Thu Mar 03, 2016 9:32 pm

I stand corrected.

Originalplan® · Post by **Originalplan®** » Thu Mar 03, 2016 10:36 pm

Thanks Oscar, i did a little test i think its kinda a good fake CD.
@galinette i used your ISL script from one of your materials and tweaked a bit.

CTZn · Post by **CTZn** » Thu Mar 17, 2016 6:18 am

hey that's wicked ! Is this using Oscar's technique ?

Post by **Oscar J** » Thu Mar 17, 2016 7:30 am

Looks great! Looks like it renders kinda slowly though?

zeitmeister · Post by **zeitmeister** » Thu Mar 17, 2016 7:49 am

Looks great! Would you mind to share the code? I am looking for something like that...

Cheers, zeiti

Originalplan® · Post by **Originalplan®** » Tue Apr 05, 2016 2:50 am

CTZn wrote:hey that's wicked ! Is this using Oscar's technique ?

SORRY GUYS JUST SEEN YOUR COMMENTS!!
Dont know why i didnt get any notification for new comments!
I try to find the material if i didnt deleted it i will share it!
@ Oscar yepp it renders slow but not superslow.

Sorry agin for not replying in time!!!

Originalplan® · Post by **Originalplan®** » Tue Apr 05, 2016 3:29 am

Time Machine saved the day Mat was deleted.
Here it is yep it uses Oscar's technic.
It is not perfect by any means...but feel free to tweek it.
And post it.

zeitmeister · Post by **zeitmeister** » Wed Apr 06, 2016 5:06 pm

Thank you very much!!

Cheers, zeiti

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