Rendering Help

KeithH

Hi -
When there are a few items in my scene it renders perfectly using Iray.
As I put more items in my scene the granier the final render becomes.
I am using default settings for Iray. What changes do I need to make to have it render without being grainy?

Thank you

kenshaw011267

If more items are reducing the final quality you likely need to increase the length of the render. 

In render settings under progressive rendering there are two settings. Max samples which defaults to 5000, which generally is more than enough for most scenes, and max time in seconds which defaults to 7200 seconds, 2 hours, I'd set that to the max and let the render run until 95% convergence or 5000 iterations and see what the render looks like.

You can also try enabling the post denoiser. Under Filtering sett post denoiser available to ON, then post denoiser enable to ON and optionally increase the post denoiser start iteration from 8. I've found that the lower the start iteration the lesscrisp the final image gets. I set it to 250 and get images that are nearly the same as a full render.

KeithH

Thank you very much