Messages

1

[Max] I need help! / Re: Noise in Shiny Gold Metal Material

« on: 2018-03-24, 07:01:43 »

Thank you for those suggestions Pokoy and Maru. These have certainly really assisted.
I should reset those settings when I do the same scenes as high res stills I assume?

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[Max] I need help! / Re: Noise in Shiny Gold Metal Material

« on: 2018-03-13, 11:35:02 »

Thankyou Maru. I will review your feedback with the full scenes and see how it works.

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[Max] I need help! / Re: Noise in Shiny Gold Metal Material

« on: 2018-03-13, 09:36:06 »

Sure Pokoy. Here is a stripped back scene with the light fitting with the revised/advised gold material (and my preferred brighter material in the material slot above it). Single light source, default render settings. HDRI imagery also attached as only the external files required.
I did notice when packaging this scene that I was using only the jpg version of the HDR file because I only wanted some extra reflections, not the full effect of the lighting. Possibly this is causing some issue. I ran some tests with the proper HDR and it is improved, but of course it changes my lighting. I will have to run some more comprehensive tests across my full scenes to see if this impacts on the noise problem. I had previously noticed that removing the HDRI from the environment slot didn't reduce the noise so I suspect this isn't the source of the problem.
Anyway would be great to know if anything jumps out in the scene for you.
Thanks!

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[Max] I need help! / Re: Noise in Shiny Gold Metal Material

« on: 2018-03-13, 08:01:31 »

Hi Pokoy, I am not using the Corona RoundEdge map. Are you suggesting I should?
I think the geometry is clean. It is modelled in max and is just a simple champhered edge. I have tested the material on a champhered box - native max geometry and I still get the noise.

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[Max] I need help! / Noise in Shiny Gold Metal Material

« on: 2018-03-13, 06:28:40 »

I have noise appearing on (the edges of) a shiny metal object. I have been through all the forums and advice I can locate on this topic. The noise is restrained to this gold metal object only. No problems anywhere else in the scene. The noise does eventually go with more passes (like many more) which is fine for my high res stills, however I will be animating these scenes so I need to be able to get my scenes to render in far fewer passes.

My scene is reasonably simple, a few objects, a couple of corona lights, a simple studio warehouse HDRI for extra reflections, rendering with path/UHD. What is unusual about the scene is that it is very dark. Very low lighting and other than the light fitting all materials are very dark or black with the detail in the image coming out through the reflections/glossies of that scene geometry.

I have adjusted my material to reflect Corona shiny metal advice (diffuse 0.0, Fresnal controlling lightness 20-100, keeping reflection colour lower than 200 and controlling colour of the material through reflection colour slot). (in the process darkening my metal more than I want it - refer test old for the brighter colour that I preferred). I have no maps in the material.

The problem repeats on simpler geometry with the same material, although again just on the edges.

I have tested GI, AA, LSM, MSI, Albedo as per Corona guidelines to reduce noise in scenes.

The problem does not occur if the reflection is turned down or off. The problem is reduced or resolved faster if I turn off the rest of the scene geometry (less reflections I guess). The HDRI I am using is not high quality, but the noise is there without the HDRI in the environment slot as well. It is worse with the HDRI in, but only because there are a few more highlight reflections generated which is where the noise occurs.

The problem seems very specifically to do with the reflection component of this material. But I don't know what I can adjust to resolve it.

And denoising to remove these areas of noise degrades the rest of the image too much.

I hope someone has some suggestions that may assist!

Thanks