SMS:Boundary Triangles: Difference between revisions
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Long thin triangles on the perimeter of the mesh can be automatically selected using the '''Select Thin Triangles''' item from the ''Elements'' menu. The triangles on the outer boundary are checked first and if the aspect ratio of a triangle is less than a critical value, the triangle is selected and the triangles adjacent to the triangle are then checked. The process continues inward until none of the adjacent triangles violate the minimum aspect ratio. | Long thin triangles on the perimeter of the mesh can be automatically selected using the '''Select Thin Triangles''' item from the ''Elements'' menu. The triangles on the outer boundary are checked first and if the aspect ratio of a triangle is less than a critical value, the triangle is selected and the triangles adjacent to the triangle are then checked. The process continues inward until none of the adjacent triangles violate the minimum aspect ratio. | ||
The "drag line" method for selecting elements was designed specifically for this purpose. Elements can be selected with a line by selecting the ''Select Elements'' tool, holding down the ''CTRL'' key, and dragging a line through all of the elements to be selected. The selected elements can then be deleted. | The "drag line" method for selecting elements was designed specifically for this purpose. Elements can be selected with a line by selecting the '''Select Elements''' tool, holding down the ''CTRL'' key, and dragging a line through all of the elements to be selected. The selected elements can then be deleted. | ||
==Related Links== | ==Related Links== | ||
Revision as of 18:19, 9 January 2015
The perimeter of the mesh resulting from the triangulation process corresponds to the convex hull of the data points. This may result in some long thin triangles or "slivers" on the perimeter of the triangulated region.
Select Thin Triangles
There are several ways to select and delete long thin triangles.
Long thin triangles on the perimeter of the mesh can be automatically selected using the Select Thin Triangles item from the Elements menu. The triangles on the outer boundary are checked first and if the aspect ratio of a triangle is less than a critical value, the triangle is selected and the triangles adjacent to the triangle are then checked. The process continues inward until none of the adjacent triangles violate the minimum aspect ratio.
The "drag line" method for selecting elements was designed specifically for this purpose. Elements can be selected with a line by selecting the Select Elements tool, holding down the CTRL key, and dragging a line through all of the elements to be selected. The selected elements can then be deleted.
Related Links
SMS – Surface-water Modeling System | ||
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| Aquaveo • SMS Tutorials • SMS Workflows | ||
