SMS:Process Boundary Triangles

From XMS Wiki
Revision as of 16:37, 3 April 2013 by Jcreer (talk | contribs)
Jump to navigationJump to search

When scatter points are triangulated, the resulting convex hull often contains triangles outside the desired mesh boundary. The Process Boundary Triangles dialog was developed to help remove invalid boundary triangles. To open the Process Boundary Triangles dialog:

OR

File:Process Boundary Triangles Dialog.jpg

Removal Options

  • Edge Ratio – A small edge ratio will result in the removal of more triangles than a large edge ratio. Specifying too small of an edge ratio will result in the removal of valid triangles. The edge ratio is calculated by dividing the length of the triangle edge on the boundary by the length of the smallest triangle edge connected to the scatter vertex end points of the triangle edge on the boundary.
  • Select – Triangles meeting the specified edge ratio are selected when OK is pressed
  • Delete – Triangles meeting the specified edge ratio are deleted when OK is pressed
  • Preview – Preview which triangles will be processed based on the specified edge ratio

Using the Tool / Practical Notes

  • Areas on the interior of the triangulation, such as islands, should be manually "seeded" by deleting one of the unneeded triangles in the interior region.
  • Triangles will not be removed if their removal would result in:
    • the removal of a scatter vertex from the triangulation
    • the creation of a "bow tie" in the scatter set. A bow tie, a point in the scatter set where the scatter set is "pinched" to a single point, is shown in the image below.

Scatter Set Bow Tie Triangles.jpg

Related Topics