Diamond render/material in Corona?

[tomislavn]

Okay, so I have asked a few times in here in some random tech threads about some real dispersion support in Corona but I never got any replies. Is there anyone who tried to render some jewelry through Corona? I am talking about this kind of quality (check attachment).

It would be a blast if I could do that with Corona, because I would then be able to completely ditch V-Ray for it in my personal work :/

Cheers!

[borisquezadaa]

I think Corona Totally does the trick.This one is made with a very cheap Hdri and with some very low render times just as example.

I guess if needed i can came out with some really great ones.

It took me about half hour to get this working.

I add a caustic pass in photoshop  just to give that little extra. I'm kind of caustic evangelist now.

[tomislavn]

Hey Boris, thank you very much for trying to replicate the material. It looks decent I guess (for a, like you said it, quick setup), but I am still not convinced. It is really tedious to setup fakes when all you need is one simple setting for the material.

I have no idea how hard would it be to implement real dispersion but I hope they do it sometimes :)

While we are at it, would you mind sharing the diamond material? How did you do the CA in the diamond (abbe)?

[borisquezadaa]

I used this data from website linked:
Diamond refraction under different wavelenghts:
blue : 472.5  IOR: 2.4390
green: 532.5  IOR: 2.4259
red  : 685.0  IOR: 2.4074


Data available from:
http://refractiveindex.info/?shelf=main&book=C&page=Peter

Just did 3 renders and composite in photoshop as additive layer. That works well for sun ligth type. Not necessary if you use another ligth rig (a monochromatic one as example).

But the thing that pops out a lot the image is the caustic pass. I did those using Mentalray. Sadly caustics are a bit slow under corona AFAIK.

+1 for a caustic pass in corona.

Attached a Photoshop with layers and blending modes so you may find it usefull.