KeyShot Forum

Technical discussions => General discussion => Topic started by: Esben Oxholm on March 31, 2013, 04:37:23 am

Title: 3d glasses - jaggy caustiscs
Post by: Esben Oxholm on March 31, 2013, 04:37:23 am
Hi.

I've been experimenting a bit with a pair of 3dglasses. I've have a sphere in the scene with the "area light diffuse" material wich provide almost all the light in the scene. The environment is set to 0.15 in brightness.

(http://dl.dropbox.com/u/2388699/3dglass.jpg)

I'm satisfied with the overall result, but the blue and red caustic from the glass that hits the ground is quite jaggy. I've tried to adjust different settings, but cant figure out how to improve the caustic.

Any good ideas?
Best regards
Title: Re: 3d glasses - jaggy caustiscs
Post by: TpwUK on March 31, 2013, 11:19:17 am
Just a guess but maybe the DOF interferes with the the caustics or the scene needs ray bounces set to a higher number ...

Martin
Title: Re: 3d glasses - jaggy caustiscs
Post by: KeyShot on March 31, 2013, 12:10:20 pm
Try to increase the shadow quality.
Title: Re: 3d glasses - jaggy caustiscs
Post by: Esben Oxholm on April 02, 2013, 06:38:01 am
Removing DOF and increasing shadow quality doesn't help.
I have furthermore tried to pump up every render setting parameter one by one without luck.

I have also tried to increase samples directly in the transparent material and in the diffuse light materials with no results...

Nothing seems to affect it. Not noticable at least.

Any ideas?

I have uploaded a package with the scene if anyone should feel like solving the problem :)
http://dl.dropbox.com/u/2388699/3dglass.ksp

Cheers.
Title: Re: 3d glasses - jaggy caustiscs
Post by: DriesV on April 02, 2013, 06:59:26 am
Aha, you got caustics (experimental) enabled for the area light.
In my experience the current caustic implementation needs super many samples (general sampling level) or much time to get smooth results.
I believe Henrik can confirm this will be greatly improved in future KS releases...

For this particular scene you might be better off with disabling caustics and switching the material of your glasses to 'Glass' (the simpe one, not solid glass...).
This will give you a semi-caustic effect that gives very smooth results very fast.

See attached ksp file.

Dries
Title: Re: 3d glasses - jaggy caustiscs
Post by: Esben Oxholm on April 02, 2013, 09:07:52 am
Nice DriesV. Thank you very much (y)