Jewelry Image Rendering Challenge.

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  08 August 2006
Hi all,

This is a preview of the upcomeing version 02 of this challenge. The scene contains more detailed high definition caustic elements.

This time the materials of the scene will be more explicitly specified to eliminate variablity.
It is is going to be a strict engine to engine challenge indicating the skill of the artist in their understanding and ability to handle the settings of their engine of choice.

Given the geometry and placement of the scene emitters, the scene sould have only one geometric optics solution. In other words if it was placed in a physics software package (like TracePro) the solution is unique... as is the case in real life ... so the expectation from all engines is that the result should be identical.

  08 August 2006
Hey, I saw this thread earlier but didn't take part. Saw the post mentioned again in a mailing list so I decided to participate this time. Did a quick first render just to check the lighting and FG, and if I have time I'll do one with higher settings (aa, caustic, glossies) of this scene or the next. Think some of the meshes came in corrupted, as can be seen on the reflections.
XSI / mentalRay

(see next post)

1:10 hours on a p4 3200mhz

Last edited by gent_k : 08 August 2006 at 06:38 PM.
  08 August 2006
OK, here's my entry. Had to remodel the rings, as the triangulated areas were screwing up the reflections.

XSI 5.11 / mentalRay

2:49 hours (p4 3200 mhz)

(was scared to turn accuracy of caustics up on my crappy pc :P)
  08 August 2006
Hi Gent_k

Thank you for the image entry !!
Should I consider this one your final quality image ?


P.S. Sorry about the mesh file and the bad geometry ... were you able to work with the obj NURBS file at all ? or the STEP file ?
  08 August 2006
Well yes, I don't plan to do another one, even though the caustics are quite noisy in this one.

About the files, I didn't even try the nurbs files as I was certain they wouldn't import correctly. XSI doesn't have that good support for nurbs and in any DCC app importing nurbs files is very tricky. For the next version of the scene I would say just go higher res on the meshes, as far as I see it efficiency isn't the main aim of this challenge.
  08 August 2006
Hey Thomas Anagnostou, I think the scale is not correct. Could you say
what is the measure of the top reflector in your scene file so I can check
I will use mental ray and there the scale is important. This render behaviour
is different with different scales.
I scaled the 3ds file to 39,4% of original imported size and now my
top reflector measures: 311,04cm x 502,93cm and so I presume your
top reflector measures 311 x 503 perhaps

That is 3meter x 5meter (and I scaled down to 39% the original imported
3ds file...). The rings are 41cm diameter aproximately...

Or perhaps I live in a modified hyperdimensional curvature in space time???
(yes I was reading these days very strange documents)

I wonder what the other people used, I was viewing no one cares of size
even using mental ray. A test I will do when post my attempt will be
scale again (scaling also the wattage of the lights, well damn lumens until
autodesk get concerned about that) and compare if the result is different
or not, I just now am not sure because the scene is very simple, no materials
involved so perhaps the scale is not a variable to have in mind. But I need
to test myself that because renderers are matematical formulas not real life.
I tend to think in real life this situation probably have the same result (with
perfectly glossy surfaces like proposed of course).

Last edited by Bao2 : 08 August 2006 at 01:42 PM.
  08 August 2006
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