Diamond caustics (with chromatic dispersion)

by **giuliojiang** » Wed Aug 17, 2011 11:35 am

In this very simple scene I wanted to play with Luxrender's chromatic dispersion feature.
I tried various transparent meshes, like icospheres, prisms and some gemstones. Then I chose the most "classic" one.

: Icosphere (smoothed), no dispersion

: Diamond, first dispersion test

Even though the "dispersion" is enabled, I couldn't really see rainbows... So I added a fresnel texture to diamond's internal volume using Cauchy's equation.
Now the white light splits into rainbow properly, but the rendering is much slower (need a lot of spp to get a clear picture). Both diamond renders have 150spp

: Diamond, dispersion with Cauchy equation

~~I would be very glad if someone could help me render and send me back some flms~~

caus.7z: caustics scene, 1920x1080; (182.18 KiB) Downloaded 39 times

by **toxi** » Thu Aug 18, 2011 9:58 am

Here you go. 700 samples for you... looking forward how this turns out with a few thousand samples.

https://devpspctclr.s3.amazonaws.com/transfer/caustics.Scene.00001_toxi_704spp.flm
https://devpspctclr.s3.amazonaws.com/transfer/caustics.Scene.00001_toxi_704spp.png

Btw. Did you see this wiki page about caustics?
http://www.luxrender.net/wiki/Creating_ ... l_Caustics

by **giuliojiang** » Thu Aug 18, 2011 11:17 am

toxi wrote:Here you go. 700 samples for you... looking forward how this turns out with a few thousand samples.

https://devpspctclr.s3.amazonaws.com/transfer/caustics.Scene.00001_toxi_704spp.flm
https://devpspctclr.s3.amazonaws.com/transfer/caustics.Scene.00001_toxi_704spp.png

Thank you very very much, I'll merge the FLMs and update the result

toxi wrote:Btw. Did you see this wiki page about caustics?
http://www.luxrender.net/wiki/Creating_ ... l_Caustics

Yes, I saw it, very interesting

by **giuliojiang** » Thu Aug 18, 2011 11:25 am

: Diamond caustics, 2KS/p

Merged FLMs, 2KS/p total.

by **Meelis** » Thu Aug 18, 2011 2:44 pm

WOW, awesome caustics.

by **zeealpal** » Fri Aug 19, 2011 8:14 pm

Did you want any more FLM's?

by **giuliojiang** » Sat Aug 20, 2011 2:46 am

zeealpal wrote:Did you want any more FLM's?

If possible, yes. Now I have 3 ks/p in total, I think with 4-5 ks/p the picture will be almost clear.

by **filanwizard** » Sun Aug 21, 2011 10:53 pm

ok just because i have them free right now I have 16+ threads chewing on this, a core i7 2600k and a core i7 920, ok also tasked a Phenom II x6 into this. I will bounce out the morning results to this posting.

and this is what I have so far, I started with a resume off the FLM posted at the top of the thread.

by **giuliojiang** » Mon Aug 22, 2011 7:03 am

thank you filanwizard. If you send me your flm, I'll merge it with mine and I'll have more than 6Ks/p in total. It will be enough and I will post the result in Finished Work.