Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: tallbox on 2015-04-13, 19:26:21
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Hello guys and from me.
I'm new in corona world, but for now i love it.
I'm doing a test scene and it's a big struggle to get decent noise free image for decent render time.
The image below (2 version - raw and after Ps) are fact of 12h render on 3k res. and still has lot's of noise. Light rays here are below 800k which is too less.
I try to rid noise at PS but there are not much that do.
Any suggestions?
G.
PS: my workstation is Xeon 1225v2 @3.20Ghz, 32 Gb ram, SSD, Gtx580 3Gb.
PPS: I've tried to tweak MSI, Sampling balance and all according to HELP info. here. I'm thinking the problem could be in frosted glass, because when i hide it Light rays go higher around 1,6 mil. rays and after 2 passes drop again to 1,1 and so on... (((
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Hi, have you tried following this to determine whether the noise comes from direct or indirect light?
https://coronarenderer.freshdesk.com/support/solutions/articles/5000516731
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Here are link to archived scene - max 2015.
https://drive.google.com/file/d/0B2MgN82_hVw9eHd1WjA0X1EteDA/view?usp=sharing
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Yes, i've tried to rise sampling balance even to GI 50/ LSM 2 but no success.
At passess seems that indirect lighting has noise.
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And i found maybe a bug.
After render region when you turn back to View from max frame buffer and when you press Render - corona give you Error creating File output. (I did't use that option in this file)
After re-open the scene all is working.
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Could you try to override the wall material?... i have a hunch that maybe the texture format in the wall material could be the issue.
I can't open your scene (dont have max 2015)
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And i found maybe a bug.
After render region when you turn back to View from max frame buffer and when you press Render - corona give you Error creating File output. (I did't use that option in this file)
After re-open the scene all is working.
Could you please report it in bugs section. With simple scene where that bug appears attached, if possible.
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Have had this error too, but only when having some render elements activated (i.e. Albedo). Seems like Corona defaults to a none existing file path for render elements, in some some rare occasions.
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I tried with deleting all bitmaps on wall and leave it on diffuse colours. Light rays was even lower than previous render.
PS: When i'm doing render regions light rays are much more and stable 1,1 - 1,2 mil.
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And i found maybe a bug.
After render region when you turn back to View from max frame buffer and when you press Render - corona give you Error creating File output. (I did't use that option in this file)
After re-open the scene all is working.
There is a bug in 3ds max that does this. You need to deactivate render elements or change their path to some existent place. Elements are probably inactive when region-rendering so this pops up when you switch to view. But I'm not completely sure about this so I'll check it and also the scene.
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I will today later
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I found second bug - after adjusting few times gradient map at opacity slot (max 2015) whole max crash. Scene was simple kids room with few objects.
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There are some things that are causing exceptional noise in this scene:
-reflective caustics - ligths (especially IES lights which may be problematic) facing reflective walls which have wrong materials (example: reflection fresnel ior at 20 or more)
-wrong materials - apart from very reflective walls, also the glass door have too high reflective ior and they had some color in diffuse slot, this is wrong - when creating glass use diffuse level 0 or pure black color, if you want the glass colored either use refraction color or absorption
The scene renders ok-ish when using grey override material so I'm 90% sure slow rendering is because of materials.
Was this scene converted from some other renderer?
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Hello maru,
yes the scene was converted from vray 3.1 scene, that we work in our studio. I just get that scene and used corona converter to test some things. I will check all things that you mention.
Thank you.
I will write later.
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"Freshly" converted scenes usually need some manual tweaking. Try to make everything as "physically correct" as possible - use correct reflectivity, fresnel values, glossiness, brightness.
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So generally after maru's comment i edited almost all materials (ior and albedo)and light rays jump up from 0,8k to 1,6-1,8 mil.? Also i removed all lights with ies and scene was lit only with corona light as spheres.
I will try to improve more - to go above 2 mil.
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So here are an update of my process.
I re-edited scene and rays goes up to 2,5 mil.
I had a problem also with corona DR - all my slaves didn't want do render anything. I read almost every forum threads here and nfo files - finally slaves still giving me these ping errors but all they DO rendering job!
Regards,
G.