Render completes when image still grainy

bwise1701

I've noticed in some setups - lower light ones or ones with hair and other intensive items that renders never converge well - they remain grainy - even if they run for hours. I've tried doubling the completion max time in render settings to 14400 - should I go higher or are there other settings I should explore?

Thanks

Padone

https://www.daz3d.com/forums/discussion/158961/11-gb-vram-insufficient-for-5-characters-for-iray-rendering

https://www.daz3d.com/forums/discussion/160336/grainy-lighting-is-there-a-way-to-remedy-this

 

EDIT: this also is very interesting

https://daz3d.com/forums/discussion/89821/iray-light-source-parameters-vs-tone-mapping-camera-parameters

SpottedKitty

Lighting quality is a lot more important in Iray than it is in 3Delight. One thing you could try is make your lights brighter (DON'T use the Intensity parameter, that's for 3Delight lights only) and adjust the "camera" controls in Tone Mapping, in the Render Settings pane. Iray renders converge better when there's lots of light, and the Tone Mapping controls let you play with the "camera exposure" to make everything darker again.

Note that this isn't a click-click-it's-done technique, you will need to try several times, doing test renders, until you get closer to the effect you want.

JamesJAB

I've found that in more complex scenes 5000 Samples is not enough.
By default Iray in Daz Studio is set to 5000 Samples, 7200 Seconds or 95% Convergence, if any of those are met the render ends.
Even though you have set your Max time to 14400, your render is claiming complete when it hits 5000 Samples.

For my renders Here are my settings
Progressive Rendering - 
Max Samples = 15000
Max Time = 0 (setting it to zero means it will not complete based on a time setting)
Rendering Converged Ratio = 100%
 

Silent Winter

JamesJAB said:

I've found that in more complex scenes 5000 Samples is not enough.
By default Iray in Daz Studio is set to 5000 Samples, 7200 Seconds or 95% Convergence, if any of those are met the render ends.
Even though you have set your Max time to 14400, your render is claiming complete when it hits 5000 Samples.

For my renders Here are my settings
Progressive Rendering - 
Max Samples = 15000
Max Time = 0 (setting it to zero means it will not complete based on a time setting)
Rendering Converged Ratio = 100%
 

Bear in mind that the last few % of that rendering converged ratio might take as long as the rest of the render itself.  95% is usually enough in a bright scene, I push it to 98% for a darker scene.  YMMV.

You can adjust after the fact though (set it to 98% and if it's still not good enough, increase it to 100% and hit 'resume render' (it'll appear to drop back to 0% but it'll catch up quickly).  The same can be done for the tone-mapping settings (adjusting up and down to brighten/darken the scene).  There's a hard-to-see little triangle/bar on the left of the render window (half-way up) - click that and the options you can change pop out in a menu.