Use the tree to add boundaries to a surface.
When you add or remove boundaries, the surface is modified and the modification is added to the definition list for the surface.
Boundaries are defined from closed polygons which affects the visibility of the triangles inside them.
If the polygon is not closed, the boundary definition forces a closed polygon.
Areas hidden by boundaries are not included in calculations, such as total area and volume.
When creating a boundary, you set arc tessellation and specify whether the boundary uses non-destructive breaklines when adding
boundaries to a surface.
When you use polygons/polylines that contain curves for boundaries or breaklines, set the mid-ordinate distance of the chord
segments, which is used to tessellate the arc segments of the boundary polygon/polyline:
Specify whether a boundary uses non-destructive breaklines when you create it by selecting in the Add Boundaries dialog box.
You cannot add non-destructive breaklines to a grid surface.
When you create a boundary with non-destructive breaklines along the edges of the boundary, the triangle edges are clipped
exactly where they cross the boundary:
If you create a boundary without non-destructive breaklines along the boundary edges, only triangles that are completely within
or outside the boundary are affected:
Tutorial Exercise: Adding an Outer Boundary to a Surface
Tutorial Exercise: Adding a Hide Boundary to a Surface
Adding Boundaries to a Surface
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