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Automatic Boundary Intersection

When adding or editing boundaries, RS2 has built-in logic which automatically intersects boundaries with each other. The routine is very general – whenever boundaries are drawn (or edited) such that they intersect existing boundaries:

  • new vertices will be inserted at all intersection points
  • all invalid boundary segments will be automatically removed (for example, segments outside of the External boundary)


  1. Create a simple EXCAVATION and EXTERNAL boundary model.
  2. Add a single segment MATERIAL boundary with both endpoints outside of the EXTERNAL boundary, and which crosses the EXCAVATION.
  3. After the boundary is added, you should notice the following:
    • Vertices are automatically created at all intersection points of the MATERIAL boundary with the EXCAVATION and EXTERNAL boundaries.
    • the portions of the MATERIAL boundary outside of the EXTERNAL boundary are automatically removed.


  1. Using the same model created above, move the EXCAVATION a short distance from its original location, such that it still intersects the MATERIAL boundary.
  2. Notice that new vertices are again created where the MATERIAL and EXCAVATION boundaries intersect.


  • The automatic intersection feature is intended as a convenience, and may prove useful in many situations. The user is encouraged to EXPERIMENT with this capability of RS2. However, there may also be times when it is more appropriate, or simpler, to manually add new vertices to boundaries, rather than having them automatically generated.
  • If you are in Snap mode while entering boundaries, if you hover the mouse over a boundary, and click the left mouse button, the new vertex will automatically be inserted at the nearest point on the boundary. See the Snap topic for details.
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