[Asmithey]

Hi,

Using Maxwell 3.2.1.5. I recently did some interior renderings. Each project was rendered to 18SL. One turned out great and one had a consistant grain on everything in the scene.

I used the same lighting, emitters, materials and sky set up using same IBL file for illumination. I even used most of the same materials on each project. The only major difference between the two projects is one has an open ceiling which all the structure is black. I am wondering if this contributed to the grain. I just used a diffuse black material. The client did not want to see any reflections on the structure above. Here are a couple of crops from the raw renderings.

I checked for duplicating emitters and emitters intersecting geometry. I did not find anything. Any ideas on why one might be grainy over another?

Thanks


Not Grainy



Grainy

[burnin]

Yup it's the black. Takes more time to clear as it doesn't bounces any rays back.
Either fix reflections in post or use gray (some neutral, ambient color).

[Asmithey]

Ok. Next time I render it like you say maybe a grey then render the alpha channel and just make it black in post. Being able to render the alpha channels is a huge time saver. I render an alpha channel for everything so I have the ability to fix things like color correction and brightness and contrast. What I did is used the alpha channels to separate everything out and did reduce noise to each piece. Some parts required more noise reduction than others. I had zero time to re-render the image.


Thanks