Curtain problem

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vgabex
Posts: 132
Joined: Sat Dec 09, 2006 2:47 pm
Location: Hungary

Curtain problem

Postby vgabex » Tue May 08, 2018 11:33 am

Hi,

What's going on here? I'm trying to render this scene. Horrible rendering times with curtains. Can somebody help me? Thanks!

curtain_problem.jpg
curtain_problem.jpg (229.23 KiB) Viewed 666 times


curtain materials and K3 settings here:
Attachments
K3_settings.zip
(251 Bytes) Downloaded 45 times
curtain_transparent.srf
(48.15 KiB) Downloaded 45 times
curtain_dark.srf
(52.26 KiB) Downloaded 44 times

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Janusz Biela
Posts: 3999
Joined: Mon Mar 13, 2006 10:39 am
Location: Finland
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Re: Curtain problem

Postby Janusz Biela » Tue May 08, 2018 12:03 pm

I do not need your scene to recognize problem :D
Here is my surface for transparent curtains.

curtains_white_transparency.srf
(45.48 KiB) Downloaded 60 times


Please notice I used KrayShader plugin with very low QMC and very low refraction setting.
This will speed up render, noise is not so much horrible (can be removed by ID mask under Photoshop)

Test it and tell me it helps.

User avatar
vgabex
Posts: 132
Joined: Sat Dec 09, 2006 2:47 pm
Location: Hungary

Re: Curtain problem

Postby vgabex » Tue May 08, 2018 12:22 pm

Thanks Janusz!

Meanwhile I tested out a fast solution:
compare_03.jpg
compare_03.jpg (238.69 KiB) Viewed 658 times


srf:
Attachments
curtain_transparent_simple_fast.srf
(48.37 KiB) Downloaded 63 times

User avatar
Janusz Biela
Posts: 3999
Joined: Mon Mar 13, 2006 10:39 am
Location: Finland
Contact:

Re: Curtain problem

Postby Janusz Biela » Tue May 08, 2018 3:05 pm

Thanks.
Just remember that white curtains need transparency and refraction blur...and this make calculation long (refraction blur). Otherwise surface will look artificial. To avoid this complex calculations (transparency+refraction blur) we use KrayShader which OVERRIDE general settings for this surface.
General setting for QMC can be 1000 rays which is good for interior to remove noise on the walls but is not necessary use these 1000rays for curtain!
Is enough force (by shader) surface to use 100 rays for QMC and very, very low amount of rays for refraction (50 rays instead 500).
Curtains are bright - noise will be less visible.


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