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I have a blender animation that I have been trying to render, but I discovered that for no apparent reason, a single frame consistently renders without any of the area lights in the scene. I have re-rendered it several times, but it is always significantly darker than the frames immediately before and after it. Is there any explanation for why this is happening, and how to fix it?

Download the blend file

Frame 86: (How the animation is supposed to look) enter image description here

Frame 87: (How this one frame looks) enter image description here

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  • $\begingroup$ You might want to pack all the external data into the .blend file and then upload it again because we cannot see textures or your baked fluid. To do so you have to go File => External Data => Pack All Into .blend $\endgroup$ – palkonimo Jul 26 '16 at 14:45
  • $\begingroup$ I packed the texture in, but the baked fluid is 250Mb, so I'm not sure what to do about that $\endgroup$ – Nicholas Hollander Jul 26 '16 at 14:49
  • $\begingroup$ The particle bake is still running for me... but in meantime, I have notice that your fluid material has two chained shaders (diffuse as input for glass)... AFAIK this is not a normal setting $\endgroup$ – lemon Jul 26 '16 at 15:18
  • $\begingroup$ There is only one missing texture in the file and I don't think it will change something significantly even if packed. I wasn't able to repeat that behaviour with UV grid texture assigned to the floor, with frames 77, 86, 87 and 89 rendered (I used lower quality for fluid baking though). The only thing to suggest as of now - do not plug output from Diffuse BSDF to Color input of Glass BSDF; plug a simple color (fluid material) $\endgroup$ – Mr Zak Jul 26 '16 at 15:20
  • $\begingroup$ Rendered frame 87, after a fuid bake from the settings of your file : i.gyazo.com/9951a28f0f2420ed6f91a46b06aff33e.png... so there is something else. On which system are you working (OS, Blender version, GPU..) ? $\endgroup$ – lemon Jul 26 '16 at 16:39

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