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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:

https://gfycat.com/charmingbarealbino

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  • $\begingroup$ 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

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  • 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

Result

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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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