[ioiooi]

First time using displacement map on the rim of the collet to create kerning effect!








Both Rings were modeled in Rhino and rendered using the scene setup above. The scene consist of three emitter planes: Two for reflections/refractions and one diffuse only to light up the ground plane.

I've noticed that the scale of the model directly affects the DoF effect in maxwell, so I've scaled the model up 10x and set the F-number to 25.

Another item I've found is that mimicing standard product photographic techniques like using a "light tent" doesn't work so well. The results tend to completely "white out" the diamonds.

[Maximus3D]

Some fine looking rings you made Derek, good work! but i'm curious.. should the emitterplanes really intersect eachother like that ? it can't be healthy for the noise.

The gemstones look great! very realistic

/ Max

[ioiooi]

Hmm, I haven't really noticed cos I let them render over night till they are abt SL 18 but I'll keep that in mind next time thanks!

[Leonardo]

Must be a fast computer!


they look tasty!


leo

[Bubbaloo]

Don't let my wife see that! She'll want one!
"Don't you love me enough to buy that for me??"

Very nice renders. Good dispersion colors on the diamonds. Did you use the diamond ior?

[ioiooi]

Thank you for your complements

I used the diamond ior file for the stones and used the platinum ior for the band and structure. I painted a simple gradiant HDR in Photoshop for the emitter planes. The model is highly detailed and includes all the rounds and fillets so Multilight was turned on to adjust the lighting.

I just run a quad-core 2.66GHz.

[simmsimaging]

Very nice images - nice modelling and lighting.

b

[chrisnvp]

Outstanding Work!! I can't begin to imagine how you model a diamond! let alone those round ones.

I found out the same thing about the DOF in maxwell. Makes sense though. Since Maxwell is a light simulator and the cameras simulate real life.

My situation was opposite to yours.
I tried to get DOF on a building shot once, in order to mimic a miniature model photo, but obviously in order to get the whole building in the shot I had to be "25 meters" away from the building. Even using an F-stop of 1 (if there was such a thing), You could never get DOF on the building features standing that far away in real life. So all I did, was scale the model way, way down and 'presto' i was able to place the camera 30cm away and had all the range of DOF i wanted by adjusting my aperture.

I wonder if you could have solved the issue by just setting the camera further back. Still use a high F-stop number. Then render the scene to a high resolution. You could then just crop the image to "Zoom" into your ring and end up with the same photo in the end.
It might take longer to render out the noise though, because of the image resolution. hmmmm... would be a nifty experiment.

I love the science behind this stuff. Here's a good read for those who care to know http://en.wikipedia.org/wiki/Depth_of_field

Cheers
Chris

[killian2828]

Wow, great stuff. I like the last two especially.

[ioiooi]

For the gem stone models, I use a program called Diamcalc, allows me to export a precise 3d model of the cut.

I'm still not that satisfied with my techniques with rendering diamonds tho. If you look at real photographic shots, the refractions inside the diamond is very different. Its way more contrasty and simplified than renderings. I have yet to find a good environment to simulate such refractions.


These rings are from the Tiffany's and Co website www.tiffany.com

I set my camera lense length to 100mm to get the right perspective, If I set it too low like 50mm and place the camera close to the ring, I get distortion that makes the stone much bigger than it really is. However if I set it too long, like 150mm+ in the telephoto range, I get really flat images with no perspective.

[Bubbaloo]

The Maxwell renderings look better color-wise than the photos.

[sandykoufax]

superb!

[Mihai]

Great renderings! You could perhaps save some render time of you don't have intersecting emitter geometry.

I've noticed that the scale of the model directly affects the DoF effect in maxwell, so I've scaled the model up 10x and set the F-number to 25.

This could give you problems since you are trying to render a diamond 10x as big as it is in real life. You could try moving the camera farther away from the ring and compensate with a larger focal length so the ring takes up the same amount of image space.

[Mr Whippy]

Yeah, making a HUGE diamond is probably why the internal refractions and reflections look out.

Make it real, setup your lights realistically, and your camera, and you should get a very natural realistic image.



Really really nice as they stand though! My last attempt at modelling a diamond ended in an hours work and a complete mess

Dave

[petrol]

Hi
im very impressed !

When you say that you painted a gradiant HDR in toshop i've got no idea of what it looks like...could you explain what is this, thanks.