I’m having some problems, in getting the right shading for a quasi to realistic, Jewel.  I’m also having problems rendering the faces, that a jewel has.

Rendering gems with mental ray, it’s in Max, but the mr setting should still apply.

http://www.rray.de/xsi/

get the Diffraction shader from here if you want to render gems correctly

Here is my current Jewel, using just a Phong Illumination shader.  Any suggestions on how, I could improve it ?

	Attachment

I’m having a similar problem I think.  I’ve spent hours trying different ways but not able to get the results like ( http://mentalraytips.blogspot.co...ndering-diamonds-and.html ) that looks amazing. 

I’ve tried to follow that tutorial but being that it is for MAX allot of the same options aren’t available in Softimage.

I also found a diffraction shader that someone said to try for this.. 

My render looks like cheap glass and far from a nice diamond.

A diamond maybe a girls best friend but not a poor rendering guys!

	Attachment

	Attachment

I’m a modeler before I’m a renderer.  I just took a simple image of a diamond ( ) dropped it in the view port (rotoscope) and away I went.

I like the way the light is bending in my image but Im not getting the surface reflection that gives the diamonds the shape. Its hard surface shape.

Well you did a good job on the Diamond.  I’m going to have to go back to the modeling process and re-model my diamond :) And give a little more time to the shading using the diffraction shader with some of your shader settings :)

Update:

Anyone have this error in Softimage 2010 x64 when I try to render using the diffraction shader.

SIConnectShaderToCnxPoint("Sources.Materials.DefaultLib.Material.Diffraction1", “Sources.Materials.DefaultLib.Material.Front_Back.back”, false)
// ERROR : LINK 0.2 error 191007: cannot load C:\Users\<account>\Autodesk\Softimage_2010_SP1\Application\spdl\..\bin\nt-x86-64\Diffraction.dll, unknown error code 193, check Win32 manual
// ERROR : PHEN 0.4 error 051011: shader “Diffraction” not found
// ERROR : PHEN 0.4 error 051011: shader “Diffraction” not found
// ERROR : PHEN 0.4 error 051011: shader “Diffraction” not found
RenderRegionToggleVisibility(null)

@gigax
Looks too me like you edge normals are soft. Try to harden them. That will help your diamonds a lot.
(No idea how to do it XSI… I’m a Maya man :P)

look at my post from before… (some posts earlier than this.) hope it helps to make the edges hard as diamonds!

ro!

hey guys i can provide you the scene with the setup i did in that xsibase thread,
here you go, i hope it helps :)

http://www.megaupload.com/?d=TAIUP861

here is the link to Daniel Rind diffraction x64 bit version, you’ll find inside the x64 folder with correct .dll

http://www.megaupload.com/?d=24RVKPC9

saluT

Thank you, now I have got it working :)