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weird jump in render times

mambanegramambanegra Posts: 586
in Daz Studio Discussion

So, I have a scene from a comic I'm making which has a couple saying goodbye. It features G3F, G3M and a suitcase (both figures are clothed and have hair). 

When I rendered them standing together so that you could see everything (including the suitcase sitting on the floor), iray happily rendered the scene at 2400 pixels tall in a few minutes. However, when I zoomed in to focus on the faces in order to do a few panels of dialog, the windows computer (with a decent card) took over 15 hours and my iMac with ATI card, was approaching 98% after letting it run over night. Even though the iMac is basically a laptop that is permanently open, it's CPU consistently beats the newer windows box for some reason, so this isn't particularly surprising, except for the fact that those scenes would not fit on the GPU

Why did the zoom force a switch to CPU only? 

Comments

  • MattymanxMattymanx Posts: 6,950
    edited November 2016

    ATI cards are not supported with Iray.

     

    As for the close up, I am guessing its all the hair which is transparancies recieving and casting shadows.

     

    Could you share your render settings with us and a screen shot of both the distant and close up?

     

    Post edited by Mattymanx on
  • mjc1016mjc1016 Posts: 15,001

    Did you actually save the first render before zooming in and rendering again?

    If you didn't then that first render was still being held in memory (video card) in case you wanted to resume it...and that could have been enough to dump it to CPU.

  • mambanegramambanegra Posts: 586

    Yeah, the mac can only do CPU, so it is generally only used when I have a really big scene which won't fit in video ram on the windows computer other than to set the scenes up which I then save to file for rendering on the windows computer. 

    As for the previous renders, I had not closed it (nor the prior one). I had cancelled two prior renders but I had reloaded the new scene from file. So, does that really gum up video ram? If so, that's very good to know. 

    I did close them down before doing the last shot (which was similar to the first but with some changes to the poses.) It completed well before the first hour passed. 

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