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I'm working on a displacement map to display details from a high-poly mesh on a low-poly mesh. However, when I bake my displacement map, it appears almost completely grey.

A screenshot of my blender workspace.

What's causing this? Is there a way to fix it?

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You are trying to bake a Displacement Map, but looking in your file shows you have no displaced mesh. What you want to do is create a Height Map from existing geometry.

This is a solution if someone experiences the same problem but has a displaced mesh: Check if you have applied the Displace Modifier and set Level Viewport to 0 in the Multires Modifier before baking the displacement.

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  • $\begingroup$ I had the level viewport set to 0, and baked again. However, I'm encountering the same issue: i.imgur.com/UMV6auL.png $\endgroup$ – MEATTAIL Nov 26 '20 at 9:45
  • $\begingroup$ Well, without any more details or the blend file to investigate further it's hard to say where the problem is. In your screenshot there is only a Texture node. Is there actually any displacement applied or is it just geometry? $\endgroup$ – Gordon Brinkmann Nov 26 '20 at 9:59
  • $\begingroup$ Here's my .blend file! I'm trying to get blender to bake a displacement map from the DetailedCup object for later use on the Cup object. I only had an image texture node to select when baking so that blender knows what to bake to. $\endgroup$ – MEATTAIL Nov 26 '20 at 10:21
  • $\begingroup$ But the DetailedCup object is not generated through displacement, it's a different geometry. That's not how baking displacement maps (from a displaced mesh) works. What you want to do is create a height map of existing geometry to use it as a displacement map. Here's a video tutorial about it, for example. But to do that, the height is measured by distance to camera so to project it onto your UV map you would have to place the object's geometry flat on the ground in the shape of the UV map. $\endgroup$ – Gordon Brinkmann Nov 26 '20 at 10:39
  • $\begingroup$ @MEATTAIL Edited the answer so it fits your problem but also helps people who have this problem with a displaced mesh. $\endgroup$ – Gordon Brinkmann Nov 27 '20 at 6:59

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