I use RT CUDA as production render for a job here and I noticed that it leaves a part of the image with different noise levels when renders finish. I didn’t stop the render manually and there was no time limit. The only limit for RT was the noise threshold. Is this normal and can I prevent it? I never get these differing noise level lines with Vray Adv.
Please check the screenshots below (2nd one is enhanced to better see the noise difference).
Is the cleaner area around the center of the image? If so, this is a known issue, but we’re not quite sure how to deal with it yet. I guess this is with a high noise threshold? It shouldn’t be visible with more samples.
As a workaround, you can try setting the noise threshold to 0 and using a time limit. You’ll probably need to run this command in the MAXScript listener too:
renderers.current.v_ray_settings.progressive_dynnoisethreshold=0
Another option is to use a lower number of rays per pixel. This will probably make the difference less visible, but it may decrease the performance.
Thanks for the workaround. I might try it out.
Yes, this is visible around the center of the image. It’s pretty much in the shape of a square. It’s like RT stopped refining the image midway instead of waiting for the pass to reach the borders of the image before it stops. It’s visible mostly on images that I haven’t waited long enough to get refined because the noise differences in the old and new passes is still large. If I have it refine for longer I’m sure it won’t be that much visible, if at all.
Yes, it shouldn’t be visible at all on final renders. The workaround is only for quick draft renders.
