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I am looking to clip the plane created by the ocean modifier - as a boolean modifier would do. This method worked well with a terrain with a simplier shape and only one dam.

The end result sould be that the water stops behind the 2 dams and doesn't go past the terrain.

What I tried:

  • using the boolean modifier with each object one after the other terrain, dam1, dam2: this makes my ocean disappear
  • useing the boolean modifier's collection operand type: this doesn't do anything (probably because the cube used as a start for the ocean modifier is small?)

enter image description here The blue parts is what I want to cut out.

enter image description here Just another view.

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  • $\begingroup$ You will need an object that is continuous -- that includes both of the dam meshes AND connected by the terrain between them. Perhaps make a duplicate of the dams, JOIN them. In EDIT mode, select (rectangular subsets) of the closet unconnected vertices (top and bottom) and use Vertex >> New Edge/Face from Vertex 'f'. You can use the result as your boolean object on the water surface. Downside: if you want to change some aspect of one of the dams, you'd have to start over recreating the boolean object. $\endgroup$
    – james_t
    May 4, 2022 at 17:41
  • $\begingroup$ That wouldn't be a problem as I won't need to change the meshes anymore. Unfortunately I am stuck at "select (rectangular subsets) of the closet unconnected vertices (top and bottom)". How do I know what are the closest unconnected vertices (top and bottom) ? Wouldn't a simple ctrl - J be the same ? $\endgroup$
    – tukanium
    May 5, 2022 at 6:27
  • $\begingroup$ I ended up deleting the vertices manually in EDIT mode. Not the best workflow but it did the job. $\endgroup$
    – tukanium
    May 5, 2022 at 7:26

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