Hi Tim, If you can produce meshes rather than individual triangle shapes, you should be able to get your desired result with the following method. Rotate to a front view. Select all of the meshes. Pick the Extrude Mesh Volume command, set the Direction to Vector , data point to accept the selection, and then define the vector pointing straight up a several thousand meters. You should now have a mesh volume. Now use the Delete Mesh Facet command with the Block method and select the facets that extend up above your original imaginary surfaces.They will be deleted, leaving you with only the bottom hull of the mesh volume. Cheers, Ron
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