Author Topic: Diamonds  (Read 8049 times)

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Offline ben10

Diamonds
« on: July 29, 2010, 06:54:49 am »








it's my first time to render a jewel and I don't know if it's physically accurate. Because of the amount of dispersion the render time is almost 2 hours but i bet in maxwell it will be 10 hours...It's a raw render no postwork. I did this just to see how keyshot will handle this kind of material as I've read many users complaining about dispersion in keyshot.
It is just a test render...Thanks zigaretos for providing this scene
« Last Edit: July 29, 2010, 07:07:23 am by ben10 »

Offline Ed

Re: Diamonds
« Reply #1 on: July 29, 2010, 12:30:47 pm »
Here are two examples I did in KeyShot.  

Diamonds are complex, but one has a lot of control based on the HDRI, gamma, brightness, and material settings.  

I can rotate my HDRI slightly and get a completely different set of colors in the dispersion.  And if one wants more or less dispersion, just adjust the diamond material abbe #.

Second image is a different HDR with more focused, less diffused lighting.  It all comes down to experimentation to get the result you're after.
« Last Edit: July 29, 2010, 04:09:23 pm by Ed »

Offline Speedster

Re: Diamonds
« Reply #2 on: July 29, 2010, 04:58:54 pm »
I'm afraid to let my wife into the office- she might see these and get dangerous ideas!  Seriously, these are really neat. 

I want to share a link to an important website that I ran across on a related search for a client.  It's been most helpful in helping me understand refraction.  Hope it helps all of you in this interesting dialogue.  It even lists the ABBE # of almost everything!

http://interactagram.com/physics/optics/refraction/

Bill G

Offline ben10

Re: Diamonds
« Reply #3 on: July 30, 2010, 08:39:28 am »
how long did it take to render?....Suddenly i forgot to save the scene...I cannot reproduce the 1st image...I think the glow effect at the ground relies in global illumination quality as I bumped it...

For the creator. I have question and I think it's a bug. I can't increase the dispersion sample above 16. The slider can't go through it.

Offline ben10

Re: Diamonds
« Reply #4 on: July 30, 2010, 08:42:11 am »
the second and third image is the default diamond material. If i decrease the abbe number to 10 and below...the dispersion will be noticeable...I think the safe area is between 3-6...1 will give full rainbow dispersion. The realtime render clears up fast but the final render is too slow...It should be optimized for the next update

Offline Ed

Re: Diamonds
« Reply #5 on: July 30, 2010, 09:41:13 am »
how long did it take to render?....Suddenly I forgot to save the scene...I cannot reproduce the 1st image...I think the glow effect at the ground relies in global illumination quality as I bumped it...

For the creator. I have question and I think it's a bug. I can't increase the dispersion sample above 16. The slider can't go through it.

The images I posted are screen shots.  Render times on multiple diamonds can be slow.  Nine times out of ten I can't tell the difference between a well-cooked screen shot and a render.  I just hit my keyboard PrtScn button and paste into PS to avoid saving as a jpg.  I only use render when I need a TIF alpha image. My images posted below cooked about 12 minutes before I captured the shot.

As far as the diamond material sliders - they work throughout their range on my system.

Ed

Offline ben10

Re: Diamonds
« Reply #6 on: July 30, 2010, 09:48:37 am »
just like my 2nd and 3rd image...they are also screenshot... they just cleared up fast...however the final rendering for the 1st image is almost 2 hours...the realtime render doesn't look the same...It doesn't have the color bleeding and glow effects plus the shadows are pixelated in realtime viewport

Offline Ed

Re: Diamonds
« Reply #7 on: July 30, 2010, 12:18:14 pm »
I made a render (top) and screen shot (bottom) with no post work.  The render took 22 minutes.
There is an obvious difference in the gamma.  I can see a little more detail and sharpness in the render version if I blow up the image.  At the normal resolution they look the same to me (other than the gamma).

I've not seen a good explanation on the differences between the render and screen shot methods.  For my work (web site images), screen shot works most the time.  If I were making large prints, or need alpha channel, then render mode would be my choice.

Ed

guest84672

  • Guest
Re: Diamonds
« Reply #8 on: July 31, 2010, 06:32:26 am »
In realtime, increase shadow quality, raybounces, and click "detailed indirect illuminationg".

The offline rendering is a completely different animal. The upcoming release will have a new feature that will let you take the realtime rendering and let it res up to bigger image ... if this makes any sense.

Offline ben10

Re: Diamonds
« Reply #9 on: August 01, 2010, 04:58:16 am »
for most of the time realtime render works but it's limited to monitor's screen size...it should also add camera tonemapping effects and vignetting. This will be really helpful.

Offline ben10

Re: Diamonds
« Reply #10 on: August 01, 2010, 05:02:00 am »
can you make the exposure controls in realtime tab not affect the rendering like other unbiased renderers out there do? It completely updates the image without re-rendering again while increasing the image's gamma and brightness and some camera effects like aberration and vignetting will be cool.

guest84672

  • Guest
Re: Diamonds
« Reply #11 on: August 01, 2010, 07:07:27 am »
I don't understand what you mean. Vignetting is coming in 2.1.

Offline ben10

Re: Diamonds
« Reply #12 on: August 07, 2010, 02:27:42 am »
like these




these are keyshot screenshot renders...limited to my monitor's screen size. BTW I used photoshop for these...but it will be cool if we can control this in realtime