Iray Depth Canvas Fuzziness

Granville

Every since Will educated us about Iray canvases, I always render to them and then adjust the balance of the 32-bit image in photoshop. This gives me way more control over the balance. I was hoping to also manage depth of field ( DOF ) with a depth canvas. When I rendered, though it has a lot of salt and pepper noise. I can't really use it for lens shift in photoshop. How can I get a smoother render? See full sized image so see the spots. I found an interesting tutorial here:

https://www.intiaz.com/2013/06/vray-z-depth-tutorial-using-photoshop/

Tobor

Was this canvas made on its own, or part of the beauty pass? Ideally you should create this type of canvas at the same time as a full beauty pass, to get the benefit of full pixel convergence. That's what the white spots appear to be.

Granville

Yes, I generated an LPE and a couple of beauty passes. They all seem fine except the depth canvas

https://www.daz3d.com/gallery/#images/407841/

Tobor

What I meant was: are you creating the depth canvas at the same time as a beauty pass? It's the beauty pass that Iray (mostly) uses to determine things like nominal luminance (if you're leaving tone mapping on) and pixel convergence. When possible, avoid rendering these canvases at separate times.

If you're not using the built-in depth canvas by name, please post your LPE string. Also note if you're leaving tone mapping on or off. With either, you can help re-hint Iray by manually adjusting the nominal luminance control. You would definitely want to do this if tone mapping has been turned off.

Finally, do you have a volume (fog, smoke, etc.) in this scene? If so, remove it for the depth canvas.

I've never seen what you're getting, even with an intentionally shortened render, so I'd suspect a conflcting setting somewhere.