Jewellery Rendering

[ioiooi]

Here is my first rendering in Vray for Rhino. I really need some help with a diamond shader. I can't seem to get the complexity or the correct refraction pattern from a real diamond. Currently I'm using a reflective layer with frenel and a refractive layer set to the physically corrent IOR of 2.42. Please help @_@ [/img]

[kinetic2]

Jewellery Rendering

I see a posting just a few places down (v-ray jewellery), may be this will help you . I think your render looks excellent
Regards
MarkO

[abhikaam]

Jewellery Rendering

I don?t make jewelery renderings, but as far as i know are light refraktions as seen in diamonds a problem.

[Travis Serio_cg]

Jewellery Rendering

hey that looks pretty good. I had the same initial problems with diamonds as well. The problem comes from the lack of dispersion. In order to get the prismic effect from the stone you'll need to introduce some color into the scene for the diamonds to reflect/refract. It appears that your environment is all grayscale.

Also, depending on the geometry of the stone you may find that increasing the IOR slightly will help. I found that on the stone geometry that I was using a value of 2.66 did a better job and did not bowtie as badly. This will be entirely geometry dependant.

One last thing that I found that helped greatly was to increase the glossyness of the reflections layer. This will help give some of the individual facets a bright reflection effect and less transparent in areas. Like facets that appear all white in places.

Your metal also seems to have a tinge of blueish/green to it as well.

This is why we really need object reflections on a per object level.

Nice render though, I really like the ground plane.

[joe_b]

Jewellery Rendering

Yeah the dispersion problem was brought to our attention a week or so ago. We're looking to fix that in our upcoming service release. Sorry for the inconveniance.

[ioiooi]

Jewellery Rendering



Thanks everyone for their input. I've attached the same image rerendered with a HDRI. I desaturated my metal color so hopefully the blue tinge should be fixed up. Otherwise, I think I gotta calibrate my monitor or something x_x; I think the reason why I coloured the metal was to preserve the silulette so that the ring doesn't blend into the white background.

Travis, thanks so much for your advice on the diamond material, its looking so much better now. I do agree it still needs work but its much much better than it was before =)

[Travis Serio_cg]

Jewellery Rendering

hey man, no problem at all. Your render does look much better. I chased the diamond render for about 10 hours one day and I can't say that I still have it mastered. Hopefully with Joe's news of the dispersion fix we will be able to rely less on HDRI maps and more dispersion.

Now if I could figure out how to make inclusions in the glass that would be great. I saw a Vray for Max material that had air bubbles in the glass, anyone know how that works? oh.. and it wasnt seperate geometry bubbles, it was the material.

[joe_b]

Jewellery Rendering

Travis,
Do you remember where you saw that material?

[Travis Serio_cg]

Jewellery Rendering

I sure do

http://www.vray-materials.de/all_materials.php?mat=201


there are more on that site too. Some with even larger inclusions.

[joe_b]

Jewellery Rendering

Ok - I'll make a vismat comparable to what he has. It shouldn't be difficult.

[Micha_cg]

Jewellery Rendering

...

Now if I could figure out how to make inclusions in the glass that would be great. I saw a Vray for Max material that had air bubbles in the glass, anyone know how that works? oh.. and it wasnt seperate geometry bubbles, it was the material.

If I'm right informed, than the bubbles are geometry of the test object. In Rhino this should be created per small spheres with inverted normals. Attention: only polygon spheres allow to invert the normals. Closed NURBS spheres show the normals outward allways.

[Travis Serio_cg]

Jewellery Rendering

Hey Micha, that was my idea as well but i dunno, many of these materials on this page have all sorts of displament maps..... the more i look the harder it is to tell.

[Micha_cg]

Jewellery Rendering

... but the bubbles of all glass materials i have seen are at the same place.

[Travis Serio_cg]

Jewellery Rendering

I know... after looking at about 50 of them today i realized the same thing. But, then again it could be 1 original bubbled glass material that other users have modified?

[ioiooi]

Jewellery Rendering


Above is a ring I designed a few years back rerendered in Vray.

And here is the same design rendered in Cinema 4D abt 2 years ago.

I still can't get the complexity in the diamond I'm looking for. Would it help to increase refraction trace depth?