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Blender cycles mist reflection problem

I'm having a problem with reflections of objects in cycles, where the standard mist pass does not seem to be properly reflected. In the image I have uploaded you can see that the mist obscures only the three nearest cubes, but in the horizontal reflective plane many more cubes are visbile going much further back, whereas in reality the visibility should be the same. I've tried switching to volumetric mist but I'm doing a long animation and it takes far longer to render.

here is the setup for the mist pass - very simple and following tutorials

here is the setup for the mist pass - very simple and following tutorials

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  • $\begingroup$ can you show how did you set the mist, reflections? $\endgroup$
    – m.ardito
    Commented Jan 7, 2018 at 14:51
  • $\begingroup$ [![here is the setup for the mist pass - very simple and following tutorials][1]][1] [1]: i.sstatic.net/zIx61.jpg $\endgroup$
    – John McCarthy
    Commented Jan 8, 2018 at 6:05
  • $\begingroup$ yes, it does the same on my 2.79... can't find a solution, let's see if others find something... $\endgroup$
    – m.ardito
    Commented Jan 8, 2018 at 9:19
  • $\begingroup$ What about faking mist inside shader using Z-depth for object that needs reflection and use Mist pass for others? $\endgroup$
    – Serge L
    Commented Jan 8, 2018 at 13:19

2 Answers 2

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The mist pass is not going to get the results you are looking for. It will only output the distance from your geometry to the camera and won’t respect your shaders’ reflectiveness. That’s why it renders so much faster than the right way to get this look, the volumetric shader for the world.

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    $\begingroup$ That's good to know. I guess I'll have to live with the mist pass in this case then. $\endgroup$
    – John McCarthy
    Commented Jan 8, 2018 at 14:33
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  1. Enable Denoising Data pass Scene > View Layer
  2. Render image out (high number of samples preferred for less aliased result)
  3. Go to compositing, use Map Value or Normalize node on Denoising Depth to get the depth data needed Compositing node setup example

Result: Left: Composite, Right: True Depth

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