Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] General Discussion => Topic started by: Tanakov on 2014-05-21, 18:17:22

Title: Curtains how do the w
Post by: Tanakov on 2014-05-21, 18:17:22

Hello

Im working on a scene that is quite easy yet client decided do close the curtains at a suny day.

My main light source is the translucent courtain it self, yet It creates awful amount of noise and firlies that just never go off.
My quess is that translucency is not the proper way to aproach courtains like this, yet I noticed something that was quite wierd for me.

Look at the "Render_1"
Mirror object reflects awful a lot of caustics, yet when courtains are taken away it does not produce them at all.
Im curious about this phenomena.

My Light setting is quite simple Corona sky + Large Sun with low power. (Theres a portal in fron of the window).
Note that this are photoshoped images, I managed to get rid of most of the FF, but Im just trying to undstand what im doing wrong.

All hints are welcome

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Title: Re: Curtains how do the w
Post by: crazyman on 2014-05-21, 18:29:28

can you show material along with settings for curtains? also, do they have thickness?

Title: Re: Curtains how do the w
Post by: Ludvik Koutny on 2014-05-21, 18:31:50

First, i would revert render settings to default.

Then, make sure your curtain or any other objects in the scene do not have disabled shadow casting. That can break energy conservation and slow down a lot.

Then, try to remove curtain first, and test if scene renders in acceptable time. If it does, try to put curtain back, check material albedo, and make sure there are no fakes, as mentioned above.

If you want light to get through, then you will have to map opacity with some fine fabric pattern, or make the curtain just a little bit refractive with thin material mode enabled.

Title: Re: Curtains how do the w
Post by: maru on 2014-05-21, 20:24:39

Does your curtain have thickness?

I'd suggest adding CESSENTIAL_direct and CESSENTIAL_indirect elements so that you can determine if the noise comes from GI or direct light. But this is just my guess.

Title: Re: Curtains how do the w
Post by: Tanakov on 2014-05-22, 00:19:13

1. No thickness
2. Checked everything, aswell with with and without courtain the render speeds up a lot when Curtains are off.
3. Thanks, will remeber that.

Title: Re: Curtains how do the w
Post by: Siahpoosh on 2014-05-22, 12:17:23

you can solve this problem by changing certain gi material in raiswitchmtl . see my examples

Title: Re: Curtains how do the w
Post by: Tanakov on 2014-05-23, 12:58:33

Thanks will test that as soon as I can, this is quite helpful just looking on to the results you have got.

Title: Re: Curtains how do the w
Post by: rampally on 2014-05-24, 07:06:20

Quote from: vrMan on 2014-05-22, 12:17:23

you can solve this problem by changing certain gi material in raiswitchmtl . see my examples

CAN WE USE  SAME METHOD FOR OUT DOOR AND INDOOR GLASS  ALSO ??? THANKS

Title: Re: Curtains how do the w
Post by: Ludvik Koutny on 2014-05-24, 10:48:19

Quote from: rampally on 2014-05-24, 07:06:20

Quote from: vrMan on 2014-05-22, 12:17:23

you can solve this problem by changing certain gi material in raiswitchmtl . see my examples

CAN WE USE  SAME METHOD FOR OUT DOOR AND INDOOR GLASS  ALSO ??? THANKS

NO!!! YOU SHOULD NOT!

GLASS WORKS WELL JUST WITH CAUSTICS DISABLED! THERE IS NO NEED TO USE RAYSWITCHER!!!!

EVEN FASTER IS, IF YOU MAKE YOUR WINDOW GLASS JUST ONE POLYGON, WITHOUT THICKNESS, AND USE GLASS WITH THIN MODE ENABLED!!!!!!

Title: Re: Curtains how do the w
Post by: romullus on 2014-05-24, 12:01:13

(http://www.ynaija.com/wp-content/uploads/2012/11/Yelling.jpg)

Title: Re: Curtains how do the w
Post by: rampally on 2014-05-24, 13:01:02

Thanks Rawalanche

AND why are you so disturbed romullus???

Title: Re: Curtains how do the w
Post by: Ondra on 2014-05-24, 13:23:48

Did somebody say.... disturbed? :D

\m/

Title: Re: Curtains how do the w
Post by: romullus on 2014-05-24, 13:49:47

Are you listening such music when writing code, Keymaster? o/O

Title: Re: Curtains how do the w
Post by: Ondra on 2014-05-24, 19:09:45

yep

Title: Re: Curtains how do the w
Post by: rampally on 2014-05-25, 05:35:45

Quote from: Keymaster on 2014-05-24, 19:09:45

yep

HAHAHAH......geniuses you mind is hyper threaded Keymaster

Title: Re: Curtains how do the w
Post by: Tanakov on 2014-05-26, 08:30:13

Quote from: vrMan on 2014-05-22, 12:17:23

you can solve this problem by changing certain gi material in raiswitchmtl . see my examples

Thanks for help, I understood what you did there, but I noticed that you placed your portal in really bad way.

Check Marus posts about that, he explained a lot about them.

Your help is apriciated, all of you.