Indigo Renderer Forum

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

Long ago, there was this thread:

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

Never tried to pull it out, though.

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.

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

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.

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.

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.

I stand corrected.

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.

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

Looks great! Looks like it renders kinda slowly though?

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


Cheers, zeiti

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!!!

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.

Thank you very much!!


Cheers, zeiti