This App creates a bounding area enveloping a set of 2-D points.
Download the file Concave Hull.opx, and then drag-and-drop onto the Origin workspace. An icon will appear in the Apps Gallery window.
- Click on the App icon to open the dialog.
This app is disabled if the active window in Origin is one of the followings:
- matrix sheet
- 3D graph
- image graph
- Set XY data as input.
The selected XY columns or active XY graph before launching this app will be set as input.
When select a graph not created from XY data, this app takes the corresponding XY data as input and ignores the others.
- Set a proper value to alpha.
If the alpha is set to a positive value, only edges contained within a sphere centered at mesh vertices will be included in the result. Otherwise, the result is the region edges of a Delaunay triangulation.
A small positive alpha value may result in isolated points. You can preview the result of a particular alpha value by clicking the Preview button or enabling Auto Preview.
- Click on the OK button to create the corresponding concave hull.
If the input data is a 2D graph, this app will add a line graph of the result to it.
You can also create a concave hull using LabTalk script as following:
ConcaveHull -r 2 iy:= alpha:=2 area:=area perimeter:=perimeter;
N.B. This App uses the VTK library. A copyright notice is included in the package.