Black renders
TheKD
Posts: 2,696
All of a sudden, I am getting black renders. The camera is not inside any geometry, I checked in case of that, even moved the camera around some. There is plenty of light. I just tried heaven benchmark in extreme mode, went normally, so I don't think it's my GPU.
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Do you have lights with a shape set, instead of the default point? If so try seelcting your lights and turning Render Emitter off - does that fix the issue? The back of a light is black and will block the camera if it's in front of it.
Still black with render emitter off hmm. I am thinking it might be a power supply problem, which is odd though. How come rendering in iray takes more power than a game engine that pushes the GPU hard? When I try to render the scene, I am hearing a chirping noise coming from the PSU. But I don't get that when gaming.
A black render wouldn't be a power supply or other hardware issue, I think - anything llike that would throw an error or, more likely, crash the system. Though it is true that rendering demands more than games, as I understand it - games make demands in bursts, but rendering is a constant, all-out drain.
I once had black renders, when there was a shader in the scene, that did not match the iray shader language. So try making items one by one invisible, in order to find out which object causing this issue.
That scene giving me fits, it was working OK for hours, I was using the iray preview while tweaking my lights, then the iray preview just stopped refreshing. I went to do a small test render to make sure my iso didn't need to be adjusted, that's when it started rendering black. I didn't notice the PSU chirp at the time, because I had music on, and it isn't much louder than the noise that the CPU makes, but it's more high pitched.
For some further tests, loaded up one g3 in new scene, rendered fine. Two g3 rendered fine too, as well as 3 g3. The scene I was working on was only a small scene with 2 g3 in it, nothing spectacular. 2 walls, a piece of frunature, 3 a point lighting with 3 spotlights and a HDRI map. I tried adding a new camera in case I inadvertantly messed up a camera setting, double checked to make sure my ISO or shutter speed didn't get all messed up. Those are the only things I can think of that would cause the black render issue.
Try merging the scene into a new scene (instead of opening it as a new scene)
Yep, same thing. As another test I switched to CPU render, and it was still black. Now I am really stumped. I do have a new PSU on the way, I really hope I didn't just waste 200 on that lol....
Does it also render black when you switch to 3Delight render?
It renders(horribly of course, because the materials are iray) in 3DL.
Well, after gaming for hours, I think it is my PSU, well it better be. I don't wanna RMA my 1070 lol. I am getting physics going nuts at random times, and some really bad stutters at random times as well, never happened before. Gonna hope it's my PSU starting to go, but not bad enough yet that it's crashing the whole system. It's a 750 watt, so stronger than needed to start with, but like 10 years old. I am upgrading to a 850 watt so I can feel comfortable runnning both my 960 and 1070, would be nice to have extra cudas for render, when I can manage to fit it in the 960 VRAM.
If it's only the render window, not the rest of the UI, then it seems vanishingly unlikely that it's your PSU. It also seems unlikely that a GPU glitch could cause this. Can you get a non-black render if you use the CPU isntead of the GPU (Render Settings pane - Advanced tab)?
CPU render on the same scene was also a black render. Also I tried on both the beta and general release to see if it made a difference. Same thing in both. I have tried turning canvases off, using a new camera. Weird thing is, PSU makes the chirpy noise with the CPU render too before it starts rendering black.
I think you can rule out hardware, then (unless it's heat, but I still think anything like that would either throw errors or affect more than the render). Is it a scene you are willing to post for others to look at?
It's bachelor bedroom rearranged a bit. Been monitoring my temps with hwmonitor, so far top temp on any core is only 44 and gpu is only 35 for top temp.
The good news, it's not you. I also get a black render when I load your scene.
EDIT: The culprit is spotlight1. If I hide it, the scene renders just fine.
EDIT of EDIT: The reason was that you had your width and height set to 700. When I reduced that to 200, it rendered properly.
https://www.daz3d.com/bachelor-bedroom ? (I ask as there's also a Bachelor's Bedroom.) I don't have either, but hopefully someone who does will be able to test your scene.
Ugh, looks like I wasted 200 then lol. Oh well, hopefully I will be able to fit my 960 in for some extra cudas *sigh*
I wonder what is making it happen though. I have used the scene many times before lol.
Reduce the width and height of your spotlight 1. That's the culprit (see my post above).
(I didn't have the bachlor bedroom either, but the scene misbehaved anyway....)
Yeah, you linked the right one. That is completely bizarre, moving the camera all over the place didn't fix it, but scaling the light down to 150 by 150 and pulling it way back did the trick. Turning off render emitter should have fixed that, unless it doesn't do what I think it does lol.
Yes, it's totally weird. I first thought it was the render settings, but they were okay. The light settings all looked normal, too. So I switched off all lights except the default sky dome, and suddenly it worked. From there, it was just simple try and error.
But you never know what weirdness DS displays next.
Anyway, I'm glad to hear that you were also able to fix your scene and that it wasn't just something on my PC...
As for the power supply, that's money well invested, i.e. since it makes funny noises.
Yeah I figure it's a good a time as any to upgrade it. It's a nice modulare one, so I won't have a mess of unused wires to have to try and hide anymore lol. Hopefully I can fit the 960 in too, it's gonna be close.
i forgot y i got black renders when harpwood trail https://www.daz3d.com/the-harpwood-trail-for-daz-studio as example and some others with skydome. tried new camera and yes deleted skydome but the whole purpose of scene is to have its clouds skydome in render any info greatly appreciated
exposure value=9
shutter spped=2
f/stop=8
film iso=600
looks ok
I had the same problem. Suddenly all my renders were black. I read all the comments and tried some things but nothing worked. Finaly I was looking in the Render Settings and noticed the shutter speed was set to zero. Once I gave it a value, the Iray started rendering again
Shutter speed zero, that is something I wouldn't have thought to look for at all.
I get this from time to time. Using a scene for weeks (making comics), once in a while I'll get a black render, but turning iRay on in the viewport renders fine, so nothing is obstructing the camera. Usually I can re-render right away and it's fine. But today this one scene, all cameras were rendering black, including perspective.
Closing DS and re-loading the scene helped. Though the first render I did after re-loading started fine, then on the 3rd or 4th iteration suddenly got darker, then a couple more iterations and it was black, and went to 100% in a few seconds.
Something in DS gets corrupted. No idea what. Is there a cache somewhere that can be deleted without hurting anything? I know there is a temp files location, where DS puts textures if you use the LIE. But don't know if there is some other cache.