OTOY Forums

Hi

A little dispersion test. Furumaru

Great pict

wowsers, that is amazing. Care to share your diamond settings?

very nice render...!!

What sort of lighting are you using for that. In my tests I've not been able to get the dispersion looking at funky as that.

Here my diamond mat and lighting setup. Furumaru

Many thanks for that. No magic there, guess I'll just have to keep experimenting.

Just wait some time for the dispersion to show it's full beauty. At the beginning of the rendering the dispersion looks always weak but it becomes stronger over time.

Very nice render !

I think that the geometry is very important to get nice dispersion/refraction.

As Octane is an unbiaised render, light follows the same path as in real world. Gems faces must be cut at the right angle, according to the IOR to allow full refraction of light. I mean that if a ray beam enter into the gem, if the angles of the faces don't create a perfect prism allowing the light to get out of the volume after N internal reflections, the gem will look dull, like a simple piece of broken glass...

So it is important to look at some references. There are many way of cutting a gem, and the angles and faces number can vary a lot, but there are precise rules, and they are different for each kind of gem (diamond, emerals, ruby...).

For example, a search with google with the keywords "diamond cut chart" gives many informations, and also an idea of the complexity of the task. :

http://www.google.fr/search?q=diamond+c ... d=0CCcQsAQ

Well done Furumaru, its really sweet!

I tried to investigate your parameters, but how do you get that "coefficient of dispertion" in your specular material?
I don't have it, and i don't founded how to add...