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Question on Inconsistent Render Times

dlm4001dlm4001 Posts: 196
in Daz Studio Discussion

I have a fairly simple scene I was almost complete with.  I did a render at 2kx2k @8K samples and it took almost 90 minutes.  Not bad for this scene. I was not happy with the image balance and I made one small object invisible (no other changes). I started a render and it was much slower.  (prediction technique. samples complete at 10 minutes x 6 for samples per hour.,  Then target samples divided by the samples per hour.  This gets me fairly close)  This render, with nothing changed except one small, non reflective item made invisible, is going to take 26.6 hours.  So. I stopped it, I closed Daz3D.  I rebooted my PC, I reopened the saved file.. (prior to making the object invisible) and measured at 10 minutes.  It says it is going to take 26.6 hours.   I can not get my head around what impacts the render speed.  Note: No other apps were running at the time of any of the renders.

Windows 10, I7-9700, 32GB RAM, nvidia RTX 2080 Super

 

 

Comments

  • frank0314frank0314 Posts: 14,049

    Have you tried taking out the prop you hid and see if it is that?

  • Catherine3678abCatherine3678ab Posts: 8,340

    C:\Users\username\AppData\Roaming\DAZ 3D\dson\cache\data  tends to require a manual cleansing.

    And yes as frank0314 suggests, removing is better than hiding.

    Also for making a correction render for a small area, one does not have to re-render the entire screen! So say you've got the render done, see a spot that needs to be redone -- touch nothing to change the viewing angle for the render, remove that object via the Scene Tab, select spot render AND the tool thing beside it to get the tab showing - select separate window for the spot render, and render. The 2 renders then can be merged together in your image editor.

  • frank0314frank0314 Posts: 14,049

    If you wish to save it for future use and in the same spot just save a preset for it and load it when you want it.

  • dlm4001dlm4001 Posts: 196
    edited September 2021

    I am going to stop the current render, remove ALL hidden objects and see what happens. 

    Ok, removing the items did not help the render speed significantly, some but not a difference between 90 minutes and 26 hours.  However, I think I found the issue.  The scene has a lot of reflective surfaces, (tile, chrome, glass, a lot of materials, and HDRI Lighting.) After looking closely at the first render, I don't think it completed.  In some reflected light areas I see grain I would not expect in a 2kx2k, 8k sample render.  I think something caused it to stop.  Maybe something I did, or maybe it just said.. "I think I am done".  (I do have render settings set to no use convergence and the time set to somethng rediculous like 120K seconds to give it time to run the 8K samples.).  26 hours seems like a long time, but.. in all fairness, light is bouncing all over this scene.  I have seem much longer for final renders. I won't complain becasue the quality is good when you give it the time.

    Post edited by dlm4001 on
  • margravemargrave Posts: 1,822

    This is why you turn off all that Render Quality/SSIM stuff and set your Max Samples and Max Time to -1.

  • kyoto kidkyoto kid Posts: 41,044

    ...I've had a similar situation with an interior scene it would usually hit the sample limit at before full convergence Earlier attempts barely made it past 50% convergence at just over 3 hours.   I made number of change to decrease the ray bounces and did several more tests. The last of which was render at quality = 1, that took 2h:41m finishing at the sample cap of 30,000 iterations and 97.25% complete.  Looked pretty clean  

    Rendering on a Maxwell Titan-X so had no issue with the process dumping to the CPU while System RAM usage was safely under the amount installed.

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