Blender

Blender

Mike Jul 14, 2017 @ 8:11am
Decrease noise in enclosed space.
If you're making a room with windows, you can take an area lamp, and set it to a portal, and set the size to the size of the window, and place it over the window...

BlenderGuru explains this better than I do.

But, what about if there aren't any windows? How would you decrease the noise then? Because I have MAJOR noise in my scene, is it because the light aren't bright?
Last edited by Mike; Jul 14, 2017 @ 8:11am
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Showing 1-15 of 16 comments
Mr Chappy Jul 14, 2017 @ 11:56am 
Possibly your sample rate is too low? How many samples are you using at the moment?
Mike Jul 14, 2017 @ 12:02pm 
Originally posted by Mr Chappy:
Possibly your sample rate is too low? How many samples are you using at the moment?
10 000...

Still there, by the way
Mr Chappy Jul 14, 2017 @ 12:39pm 
Can you show a pic of your scene.
Scre Jul 16, 2017 @ 4:05am 
More clamp
There are a few ways search for "blender tutorials: how to reduce fireflies"
Mr Chappy Jul 16, 2017 @ 7:04am 
Originally posted by Scre:
More clamp
There are a few ways search for "blender tutorials: how to reduce fireflies"

Clamp helps with some things(noise from very highly reflective surfaces being one) but at a cost to accuracy, with him saying he has "MAJOR" noise I doubt this will help much...

We really need to see a pic of your current render to have any idea as to how to help you reduce the noise, 10 000 samples is a lot! Most renders will be noise free at half this with very minimal clamping at the most.
Mike Jul 16, 2017 @ 7:11am 
Originally posted by Mr Chappy:
Originally posted by Scre:
More clamp
There are a few ways search for "blender tutorials: how to reduce fireflies"

Clamp helps with some things(noise from very highly reflective surfaces being one) but at a cost to accuracy, with him saying he has "MAJOR" noise I doubt this will help much...

We really need to see a pic of your current render to have any idea as to how to help you reduce the noise, 10 000 samples is a lot! Most renders will be noise free at half this with very minimal clamping at the most.
Sorry that I haven't supplied a picture, I'll do so now...

Mr Chappy Jul 16, 2017 @ 7:12am 
Originally posted by Grand Parsifal ✗:
Sorry that I haven't supplied a picture, I'll do so now...

No problem, you should get some better answers/options from people once you do :)
Mike Jul 16, 2017 @ 7:36am 
Originally posted by Mr Chappy:
Originally posted by Grand Parsifal ✗:
Sorry that I haven't supplied a picture, I'll do so now...

No problem, you should get some better answers/options from people once you do :)
I only rendered it as a video, so I'm going to link that for now.
Mike Jul 16, 2017 @ 7:55am 
Originally posted by Mr Chappy:
Can you show a pic of your scene.
Originally posted by Mr Chappy:
No problem, you should get some better answers/options from people once you do :)
Here's the image: http://i.imgur.com/A9BgwPk.png
This was rendered at 720p at 1000 samples. Rendering at 10 000 gave me the exact same results, I studied it closely and the difference was very, very small.
Last edited by Mike; Jul 16, 2017 @ 7:56am
Mr Chappy Jul 16, 2017 @ 8:56am 
Hi,

Could you post a pic of you Render Settings -> Showing both Sampling and Light paths.

How are you doing your lights? Emission or lamps or a mix? Could you post/show your settings for one of these?

Do you have any glass materials covering your lights in any way?

How reflective is the material in the light fittings? A pic of this node set up and maybe your wall material and ceiling tile material node set ups might help too.

Thanks!
Mr Chappy Jul 16, 2017 @ 8:58am 
...one last thing.

Do you get noise if you put lamps in your room(without the other lights) placed more centrally within the room rather than in the ceiling?
Mike Jul 16, 2017 @ 9:47am 
Originally posted by Mr Chappy:
Could you post a pic of you Render Settings -> Showing both Sampling and Light paths.
http://i.imgur.com/5P4bhfK.png

Originally posted by Mr Chappy:
How are you doing your lights? Emission or lamps or a mix? Could you post/show your settings for one of these?
The lights are Area lamps (with the exact same settings), with simple cylinders with emission on it, that's it.

http://i.imgur.com/ZwG5lrS.png
Originally posted by Mr Chappy:
Do you have any glass materials covering your lights in any way?
Nope.

Originally posted by Mr Chappy:
How reflective is the material in the light fittings? A pic of this node set up and maybe your wall material and ceiling tile material node set ups might help too.
http://i.imgur.com/pxZz5wb.png
The lights consist of a casing, which is just diffuse, the lights are pure emission (of 30), and those "refelectors" are literally just diffuse, they made the scene even more noisy, so I removed the glossy material, then there's the lamp which is just under the entire setup.

Originally posted by Mr Chappy:
Do you get noise if you put lamps in your room(without the other lights) placed more centrally within the room rather than in the ceiling?
I can't put light in the center of the room, however, I'll experiment.
Last edited by Mike; Jul 16, 2017 @ 9:47am
Mr Chappy Jul 16, 2017 @ 10:21am 
Hi again,

Your light bounces are way too low in the light path settings, always set it to "limited global illumination" or for more realistic "Full global illumination"(I pretty much always have it on this).

Do you know how to do a viewport render for previewing your scene? If not then press "Shift+z" to toggle on off. In your "Samples" settings ramp up the "Preview" setting to something closer to your render settings, this if for the viewport preview render.

Make the reflectors in your lights reflective again when you have done this, they should work properly now with a bit of luck!

Let me know if this is working for you now, cheers.
Last edited by Mr Chappy; Jul 16, 2017 @ 10:22am
Mr Chappy Jul 16, 2017 @ 10:53am 
You might want to parent(group) some of your objects together too. Your "Scene" object list looks very very long.

To parent objects select as many as you want to group together in "Object" mode using "Shift" select.
The yellow highlighted object will be the parent(you can create an empty for this if you like), all the dark orange outlined objects will be parented to this object.
Press "Ctrl+p" then select "Object" from the options that appear. When you move the parent all child objects will move with it, you can move child objects individually by selecting them as normal.
If you get any weird behaviour whilst doing this then it is likely that one or more of your child objects and/or your parent object does not have a scale of 1,1,1 . Make sure you apply scale before parenting objects to avoid this.
Mika Jul 17, 2017 @ 12:54pm 
A few months ago it was same problem with the emission material...

Using Branch Path Tracing helps to reduce te noise with emission material.

Later with another render I had the same problem but in a closed room. To solve the problem I downloaded the BETA of Blender 2.79 (2.78.5) with the DENOISSING function, with that I eliminate all the noise, the result is a very clear image without noise. Maybe some point is blurred using only 256 Samples.

Sorry my bad English, I must continue studying but I never do...
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Date Posted: Jul 14, 2017 @ 8:11am
Posts: 16