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Hi Everyone,

Any suggestion for IOR diamond material ( better set up ). I'm using the diamond material download from Maxwell site. Is there anyone have better diamond material set up nicer can share with us.

Here is my rendering. Sorry for grainy!


By tony_leung at 2010-11-02

Thanks!
Tony Leung

You can use the full IOR file that comes with the Maxwell install. I forget what the name of it is, maybe cubic carbon?

as far as i know - i was in contact with a guy who professionally creates diamond photography and renderings - the most important factor is the absolute perfect stone cut / 3d mesh to "unleash" the "fire" which makes expensive diamonds so unique.

as long as the diamond model and lighting itself is bad you can use whatever IOR material you want, you won't reach real world quality.



but i guess you have access to very precise stones, so i'm looking forward to see some nice close-ups !

Hi Deadalvs & Bubbaloo,

Thanks for your information! I did try IOR file in cubic carbon before. In real world diamond has RI 2.417 if the cut is in ideal proportion, light should be total reflected to the crown. The diamond material I'm using seems having too much dispersion. In some situation eg. The rendering of my engagement ring with large size of diamond look like crystal more than real diamond in some angle from perspective view.

Thanks!
Tony

Tung Ling Leung wrote: The diamond material I'm using seems having too much dispersion.

Try changing the "Abbe" number in your material, test it and when you are satisfied with how the dispersion looks, save that as a new diamond material. From the manual.

The
name Abbe comes from the German physicist Ernst Abbe, who defined the Abbe number.
Abbe controls the amount of dispersion. The higher the Abbe number, the less dispersion
will be visible in the render. An Abbe number higher than 60-70 will render as if dispersion
was not activated.
Dispersion must be enabled in the Material Properties panel; otherwise the Abbe parameter
in the BSDF will be grayed-out. Because dispersion generally takes longer to render, it is
disabled by default.

Changes to R.I. are not very noticeable unless you drop below 2.0 or so and then you will notice increasing "tilt windowing" in gemstones. I use this program to "test" different cuts in gems before I commit to actually cutting expensive material and it works great. You just have to learn to adjust your material properties and light sources to arrive at the look you want, (meaning that diamonds really do look "glassy" in diffuse lighting and if there's a problem, then look at your lighting or material settings).