Removing noise in Arnold Render

[Anonymous]

Hello,

I am attempting to remove noise from a tree model I downloaded. I attempted to play with the specularity, added a rayswitch shader at one point as well as clamping sample values to no avail.

If someone can have a look, that would be great. I feel like there a million things to try with this and only a few solutions to fix this.

Thanks.

[mspeer]

Hi!

https://support.solidangle.com/display/ARP/Removing+Noise

For further help, please upload the scene-file.

[Anonymous]

It looks like direct specular noise. Here is what happens when I run the AOV in the render view:

I want to send the scene to you, but it's 89mb (after zipping it). Is there another way I can send it to you?

Thanks

[mspeer]

Hi!

To make the scene smaller just delete 80% of the faces of the tree (it's just a repetition of leaves).

Materials and settings will be kept.

The first recommendation would be to use Arnold Shaders (don't use Phong with Arnold).

[Anonymous]

HI mspeer,

Thanks!

I uploaded the scene and removed most of the leaves.

I switched from Phong to a standard AI shader but the color and luster is lost, although the fireflies are gone.

Thanks

[mspeer · Accepted solution]

Hi!

The main problem is the leaf geometry. With only one face you have one angle with full reflectivity (from a directional light) and for all other angles it is zero.

Solution:

1. Better leaf geometry

2. Tune shader for a more soft highlight

3. With an Arnold Shader make use of Weight and Roughness Attributes for Base and Specular.

4. Use an other light source like a SkyDome Light + HDRI or make use of the Angle Attribute in the Arnold tab of the directional light (which simulates a bigger light source).

[Anonymous]

I just changed the material to Lambert and it gave me the result I wanted. 

Thanks for the help, again mspeer.