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Corona light settings - Help!
show user profile  Lolflakes
I am creating a storehouse in 3ds max and are using Corona as render enginge. It's an interior scene with corona light in the roof. When I render the result is this:

The image is very unsharp and grainy. What settings should I change to get a better picture? I am very bad on light settings, it feels like science for me.

(sry for bad english)
read 958 times
9/13/2015 11:13:13 PM (last edit: 9/13/2015 11:13:13 PM)
show user profile  luxxeon
It's grainy in this image, but you only have 1 pass completed there, so that's to be expected. Let's see what it looks like at 40 to 60 passes. Most of the settings look OK, but depth of field will make things look unsharp, if the Fstop or focal length isn't set correctly. Also, you might wanna set your GI/AA balance back down to 16, for a faster result. Light sample multiplier seems too high also. Setting it to 2 is good enough for most scenes.

My Youtube Video Tutorials:
read 946 times
9/14/2015 4:08:06 AM (last edit: 9/14/2015 4:10:37 AM)
show user profile  jpedleham
Most of the settings in corona are fairly optimal for most scenes so id leave them alone.
As for the graininess luxxeon is right you need to leave it for a good few passes before getting a clean result. i usually go for 80 passes for a test render then about 200 for a final render.
read 924 times
9/14/2015 10:06:56 AM (last edit: 9/14/2015 10:06:56 AM)
show user profile  jpedleham
As for being bad on light settings. Corona is physically based somewhat so if you set your light to be the right size and the right wattage it will render correctly. so if you made a spherical light the size of a lightbulb and set it to 60W then it will render correctly as a 60w lightbulb.
read 908 times
9/14/2015 3:40:09 PM (last edit: 9/14/2015 3:40:09 PM)
show user profile  Lolflakes
Thnx for answers. This is the result after 106 passes. Looks pretty good. I removed the corona light and used corona sun instead. :)

read 898 times
9/14/2015 9:06:18 PM (last edit: 9/14/2015 9:09:13 PM)
show user profile  luxxeon
Is your scene entirely enclosed? Meaning, is the camera inside of an enclosed environment, with 4 walls, ceiling, and floor? If so, one trick you can do to speed up rendering greatly, and reduce artifacts, may be to remove the wall directly behind the camera. It's not going to be seen in the render, so you really don't need it. This will allow more light from the outside to enter the scene, and speed things up greatly. This may also allow you to reduce the intensity of the other lights in the scene. If that is not possible for whatever reason, then be sure you're using a light portal in the windows, to help focus the skylight calculations to the interior of the scene.

Your render looks ok here, but I think if you could remove that backfacing wall, or at least put a hole in the wall, and insert a portal in there, you might get a faster, cleaner result.

My Youtube Video Tutorials:
read 886 times
9/15/2015 1:20:51 AM (last edit: 9/15/2015 1:21:48 AM)
show user profile  Bolteon
"you might get a faster, cleaner result."

And a completely different look. :-/

-Marko Mandaric

read 881 times
9/15/2015 1:36:23 AM (last edit: 9/15/2015 1:36:23 AM)
show user profile  luxxeon
"And a completely different look. :-/ "

Only a greater light fill, which can be corrected with certain techniques, like adding dummy props behind the camera, adjusting certain exposure settings, or using a studio HDR, with black space behind the camera, and even post-process level correction. I'm just suggesting for sake of speeding up the render, and getting cleaner result, with less noise, in less passes. Of course, if you aren't happy with the look, then don't worry bout all that.

My Youtube Video Tutorials:
read 873 times
9/15/2015 6:19:34 AM (last edit: 9/15/2015 6:29:46 AM)
show user profile  jpedleham
The portals are a must, if youre not well versed with corona, you need to make a new coronaPortalmtl and apply it to a plane that fits nicely inside each window. Youll get much nicer results and more accurate. Also make sure you have a coronasky in the env slot to add to those soft shadows and add a slight blue hue. it really helps :)
read 862 times
9/15/2015 9:57:25 AM (last edit: 9/15/2015 9:57:25 AM)
show user profile  Nik Clark
Corona is awesome. I miss it, having moved away from Max.

read 860 times
9/15/2015 10:03:37 AM (last edit: 9/15/2015 10:03:37 AM)
show user profile  jpedleham
^You get to use renderman though. we max users dont get that privilege yet!
read 843 times
9/15/2015 2:28:18 PM (last edit: 9/15/2015 2:28:18 PM)
show user profile  Lolflakes
Yes, the room was closed expcept for the windows. I changed the back wall to a Portal and this is how it looks like (64 passes):

What do you think is best?
read 833 times
9/15/2015 3:14:32 PM (last edit: 9/15/2015 3:15:05 PM)
show user profile  jpedleham
you can definitely tell theres a lightsource back there but it could easily be an open roller shutter. Did you put portals in the windows too?
read 826 times
9/15/2015 5:34:51 PM (last edit: 9/15/2015 5:34:51 PM)
show user profile  Lolflakes
Yes I did. I created a plane and applied "CoronaPortalMtl" from material editor
read 823 times
9/15/2015 5:43:12 PM (last edit: 9/15/2015 5:59:03 PM)
show user profile  jpedleham
One plane over them all or one plane that fits each window? From what I understand they need to fit each window for it to render correctly.
read 815 times
9/15/2015 8:36:13 PM (last edit: 9/15/2015 8:36:13 PM)
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