Grainy

clell_1cc147d0c7

Hey Guys;

I'm trying to render a rather low light image. My results are great except that the image is VERY grainy. I'm running Win10 64bit with an Nvidia GT640 graphics card. 

Any and all help would be greatly appreciated.

Thanks Hooch68

Tottallou

Sounds like the render is not getting enough time to finish especially as I would think the render is using CPU - The GTX 640 probably does not have enough memory to render a larger scene

For Iray, there are 3 stop conditions and all of them may be adjusted by going to

Render Settings > Progressive Rendering > Completion

The most likely one you are reaching is time as by default Studio sets 2 Hours (7200 seconds)

So just increase the value or change it to 0 (0 = no time limit)

You can also Increase Maximum Samples to 15000 & Rendering Converged Ratio to 99%

You can find out for sure whats stopping your render in the log file (Help > Troubleshooting > View Log).

Dark/low light scenes always take a longer time to render so lots of patience is required :)

If you are like me and are short on patience then your other option is giving it more light then using Photoshop/Gimp to darken things

 

Richard Haseltine

You can also use the Tone Mapping proeprties, in Render Settings, to darken the image - if you are going to make dramatic chnages and are saving the plain render (not using Canvasses to geenrate an .exr) then doing at least rought exposure adjustment in the render is probably wise as a radical tonal adjustment in Photoshop with only 8 bits per channel will cause some degree of posterisation.

Padone

The integrated denoiser filter doesn't work in DS so you will always get some degree of graininess specially in darker areas. Using a denoiser in GIMP or Photoshop is the only way.

Alternatively you can pass to a better render engine such as Cycles that features integrated denoising.

Padone

Just to show what I mean below it's the same scene. The first picture is rendered with iray and it takes 3m 30s. The second picture is rendered with cycles and it takes just 60s. As you can see yourself cycles is not only much faster but also a lot better in final quality. And it also takes much less memory since it's tiled.

 

geoff6

Question: How do you render using cycles with Daz 4.9?

Cycles is the Blender render engine right? Or can it be installed to run out of Daz?

Thanks in advance,

G

Padone

I mainly use DS as a content generator for Blender. That's because at this time DS is too much limited for rendering, animation and effects. While the content library is generally good and not expensive. To export to Blender I mainly use obj for scenes and fbx for characters. Then some materials may need a retouch, but most of the times it's good enough just as it is.

 

EDIT: for the sake of completeness I'd add that in the comparison above I managed to keep the iray materials and the cycles materials as equal as possible just to get a fair match. And both are lighted with the same HDR map.