Marcus Johnston

Gaalvk
You can search through previous posts; this issue has already been discussed here. The tricky part is that the viewport needs tangents (and maybe normals too?) to display height, and OpenGL calculates them automatically under the hood, while Vulkan doesn't calculate them by default because it's faster and they're usually not needed. There are two options: 1) enable tangents in the display settings under Geometry. There's a setting in the bottom right called "Auto generate tangents." It's disabled by default. You need to enable Mikkt because you need Mikkt tangents. Will Fast work? Honestly, I don't remember. I remember the developers specifically mentioning Mikkt.
2) The second option to avoid constant and unnecessary autocalculation of tangents is to manually generate them on the geometry where they're needed. And that's the right solution. In theory, they're created by the Polyframe node, with the default names tangentu and tangentv. The main thing is to select the style—MikkT—in the menu. And according to the developers, the viewport should pick them up and work.

But! Back then, no matter what I tried, I couldn't get the viewport to show the height with the Polyframe tangents. So I settled on autocalculation—set it to default. And that's how it stayed. But since this conversation and testing were a long time ago, it's possible it was a bug, and now everything works with manual tangents as well—try it and let us know. Frankly, I haven't had time for more testing.

I'm also having this issue, but auto generating tangents doesn't solve it. Likewise, opengl has displacement working but is a bit unpleasant to work with.

Gaalvk
Maybe the height scale was accidentally set to 0 in the "previewmaterial" node itself?

Afraid not, height scale is set to 1 unfortunately!

Hello!

I'm just trying to do something simple by displacing a noise but displacement in the viewport doesn't seem to be working for me. Any help would be greatly appreciated.