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IRay Render Question (anyone seen this before?)

Fragg1960Fragg1960 Posts: 363
in The Commons

Yesterday I finished a scene, set up my render save options, hit Render and went to bed (letting the render go over night).  This morning when I looked at the render, the overall quality of it was fine (good detail) but it looked like someone had put a dark filter on the top half of the scene (see detail from render, attached).  The top of it was affected, not the bottom, but as I said, even the dark area had good detail.  I'm a bit confused.  It's a lower light scene, so maybe there was not enough light.  But if so, then how come the top part doesn not look bad and really grainy (just dark) and why did it affect exactly just half the scene?  Anyone seen this before?

I'm running DAZ Studio version 4.10 on a good rig (no problems rendering before).

Comments

  • Dim ReaperDim Reaper Posts: 687

    That looks to me like something is either in front of the camera or in front of the light source.

    First thing that I would try is to click the Surface Selection Tool, and then click in the top half of the viewport and see if any object is there.

    The next thing would be to move your camera back and see if there are any objects in front of light sources (including other light sources).

  • outrider42outrider42 Posts: 3,679
    Are you by chance using 2 GPUs to render? Something may have gone out of sync between them. I have seen something sort of like this, except the top or bottom was semi transparent. That happened when I ran real close to VRAM capacity. What may have happened is one GPU somehow exceeded its VRAM part way through the render, and dropped out. Or some other error that caused it to stop.

    Check your help log out for any errors during the render and you should find a line indicating that one GPU had an error.
  • Fragg1960Fragg1960 Posts: 363

    Thanks for the feeback.  I checked and there was nothing obstructing the camera or the light (there is a clear line of sight from camera to subject).  I rendered it again without changes and it came out fine.  Then I wanted to make a couple of corrections, so I made them and rendered again and this time I got the error that outrider42 mentioned (the top half of the image was semi-transparent and the bottom was fine).  I only have one GPU so it looks like it may be a memory issue of some kind. 

    Unless anyone knows any other way to address the problem guess I need to go in and slim down my scene somehow. I am using some big sets (kitbashed together) so I am probably chewing up the memory.

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