Use the Shrinkwrap tool to surround parts with a single isosurface.

Location: PolyMesh ribbon

Select one or more parts, then click Shrinkwrap to generate a single PolyMesh part.
  • The Shrinkwrap tool is useful when you want to merge optimized results with non-design-space regions. You would do this so you can fit a single PolyNURBS over the entire model.
  • By default, the selected parts are merged into a single part. This option can be disabled in the guidebar options menu.
  • Convert the shrinkwrapped part to a triangle mesh using the right-click context menu. You can then Boolean or use the Smooth tool on the triangular mesh.