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Triangles disappear when editing terrain model using swap line if feature definition does not have triangles on.

  1. Open up a dgn with a terrain and set the feature definition to only display the boundary.

  2. Turn on triangles

  3. Edit terrain with Swap Line command

  4. Once you use the command the triangles disappear and reverts back to the initial feature definition. It does not hold that you turned the triangles on.

Civil Product Used OpenRoads Designer