KeyShot Forum

Gallery => Amazing Shots => Topic started by: ben10 on July 29, 2010, 06:54:49 AM

Title: Diamonds
Post by: ben10 on July 29, 2010, 06:54:49 AM
(http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs092.snc4/35944_1398219549054_1039203156_30892792_3013120_n.jpg)

(http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs221.snc4/38396_1398231149344_1039203156_30892796_8347367_n.jpg)


(http://sphotos.ak.fbcdn.net/hphotos-ak-ash2/hs087.ash2/37669_1398230629331_1039203156_30892795_7436321_n.jpg)


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
Title: Re: Diamonds
Post by: Ed 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.
Title: Re: Diamonds
Post by: Speedster 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/ (http://interactagram.com/physics/optics/refraction/)

Bill G
Title: Re: Diamonds
Post by: ben10 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.
Title: Re: Diamonds
Post by: ben10 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
Title: Re: Diamonds
Post by: Ed on July 30, 2010, 09:41:13 AM
Quote from: ben10 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.

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
Title: Re: Diamonds
Post by: ben10 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
Title: Re: Diamonds
Post by: Ed 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
Title: Re: Diamonds
Post by: guest84672 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.
Title: Re: Diamonds
Post by: ben10 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.
Title: Re: Diamonds
Post by: ben10 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.
Title: Re: Diamonds
Post by: guest84672 on August 01, 2010, 07:07:27 AM
I don't understand what you mean. Vignetting is coming in 2.1.
Title: Re: Diamonds
Post by: ben10 on August 07, 2010, 02:27:42 AM
like these
(http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs218.snc4/39220_1406562037611_1039203156_30914371_8383611_n.jpg)
(http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs259.snc4/40306_1406562237616_1039203156_30914372_3135620_n.jpg)
(http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs165.snc4/37577_1396064535180_1039203156_30887132_6842402_n.jpg)

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