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To edit the surface triangles from the Surface and Volumes click Surfaces.
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Select a surface from the list and click View.
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This opens the View page for the selected surface.
Add a triangle
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To manually add a triangle click New.
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Select graphically the 3 vertexes of the new triangle.
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After the three vertexes have been selected, the new triangle is created.
Delete a triangle
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To delete an incorrect triangle click Delete.
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Select the triangle clicking in the graphic view. It is possible to click to select more triangles.
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Click OK to delete the triangles.
Swap triangles
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The command is used to change the direction of the faces of two triangles having a common side.
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Click Swap.
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Click in graphic view to select the triangle.
Add offset
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The command is used to apply an elevation offset to a surface, for example to moving entire surface up or down.
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Click Data.
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Select Add offset.
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Enter the offset to apply and click OK.