[solved] Noise - problem

[rodrigoavicennte]

Hi

Now eased a bit here at work I decided to study the Corona a bit more.

But I must have a problem because I can never make a surrender without noise.

The image below has the following characteristics:

Resolution 1000x667px
Render time: approx. 8 minutes

My pc:

I7- 3930K
16GB Ram

3ds max 2014
And original corona in the latest version.

The scene is very simple.  There is a base material with medium gray (128).
The windows has a glass material with Thin option enable

There is only one light in the scene Corona Sun.
There are four planes on the windows and one on the door with a Corona Portal Material

The Albedo this all ok.

Settings standard Corona (everyone says is so pressing in yield without changing the settings)

PT + UHD Cache

GI vs AA: 16
LSM: 2
MSI 20
Max ray depth: 25

128 pass

The result was below:

Much noise.

Can anyone give me a light? I really want to migrate from vray for corona and begin to put it into production.

Thank you

[Nekrobul]

1 do you use portals?
2 can you share albedo pas?

[Frood]

What does it look like when rendering to 200 passes? 128 is a bit low for interiors. You can also render a direct and indirect pass to see where the noise comes from. (https://coronarenderer.freshdesk.com/support/solutions/articles/5000516731) and change LSM depending on the result (https://coronarenderer.freshdesk.com/support/solutions/articles/5000515640).

Good Luck!

@Nekrobul:

[...] There are four planes on the windows and one on the door with a Corona Portal Material

[Stan_But]

How to get rid of excessive noise?  - https://coronarenderer.freshdesk.com/support/solutions/articles/5000501983

[rodrigoavicennte]

Hi Frood,

This is the new test I did now using 200 pass. I did not see significant improvement.

Also follow the elements (direct, indirect and albedo)

Thank you

[maru]

Hello, I can see you submitted a support ticket about this, but you are not responding there.

[rodrigoavicennte]

Hi guys

I did a test following Maru´s recommendations.

GIvsAA 32, LMS 4, MSI 10

I deleted the portal door and created a large portal at the top of the building.

I liked the result.

30min time with only 100pass

What do you think?

[aleksandraleksandr]

Hi guys

I did a test following Maru´s recommendations.

GIvsAA 32, LMS 4, MSI 10

I deleted the portal door and created a large portal at the top of the building.

I liked the result.

30min time with only 100pass

What do you think?

That's perfect!)

[Frood]

What do you think?

Yes, nice!. Except those high contrast jagged edges (table in the front). I never know how to handle such areas correctly.

Good Luck!

[maru]

Rendering in higher resolution would definitely help. ;)

[Frood]

Sure it helps but this is not "correctly" in my understanding :)

Good Luck!

[maru]

Draw a diagonal line that won't be aliased on a 10x10 grid. ;)
Maybe internal resolution = 2 would help here.

[Cheesemsmsm]

Maru, can you explain why you suggested to delete the door portal and create a large portal at the top of the building ?

[maru]

Because there shouldn't be any "obstacles" behind the portals. I do not know the tech behind it, but even Ondrej said there is no way to be 100% sure if portal will speed things up or not, you just have to try it. And comparing different configurations is not very time-consuming. You can select a region, or render only a few passes. Placing the portal in the door frame would be pretty much like in this example, only more extreme:
https://corona-renderer.com/stuff/helpdesk/portals/howto/room_portal_inside_wrong.jpg

and it should be like this:
https://corona-renderer.com/stuff/helpdesk/portals/howto/room_portal_cap.jpg

( see more here: https://coronarenderer.freshdesk.com/support/solutions/articles/5000501660 )

[Cheesemsmsm]

Thank you for your quick reply. You're that best mod i've ever seen :D

I've read the article. but i still don't understand why he said he place a large portal at the top of building.
If i dont mistake, the portal supposed to place at the hole (with perfectly capping).