I have a plane with a Displace modifier, as well as Subdivision. I've imported a heightmap and got it to the desired height, however I'd like to make this into a solid block.

heightmap created using displace and subdivide

Essentially I want to bring the edges straight down, with totally flat sides and bottom. I've tried a few things such as extrusion, solidify and thickness, but neither worked as intended (possibly a conflict with the subdivision).

This looked like what I wanted, but it still doesn't provide the results I'm looking for.

If I simply extrude the outer edges down, this is the result:


  • $\begingroup$ have you tried to assign the extruded part to a vertex group, as suggested in the link you provide, or here by Marty Fouts? $\endgroup$
    – moonboots
    Sep 8, 2021 at 5:37

2 Answers 2

  • Make a cube

In Edit Mode

  • select the vertices of the top face of the cube.
  • Create a new Vertex Group
  • Assign those vertices to the new Group
  • Add your Displacement Modifier
  • Set it to use your new Vertex Group

Cube with top face vertices selected

Vertex group that includes those vertices

Displacement Modifier using that group



enter image description hereI simply used the landscape generator to generate a landscape, tabbed into edit mode, selected the bottom faces and extruded it down the Z axis

Maybe you need to apply your modifiers before extruding or apply all transformations.

enter image description here


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