Plane features are exported in IGES the way they appear in the Graphic Display window. If the triangle representation of the plane is selected from the Display area of the dialog box, it is exported as a triangle bounded plane. If the outline is selected, the plane is exported as a convex polygon.
For an example of these display types, see "Using the Display Area" under the "Constructing a Plane Feature" topic.
The following sub-topics show the locations of the Display areas in each of the plane feature dialog box types:
Construct Plane Feature Dialog Box
Measured Plane Feature Dialog Box
The display type can also be changed in the Edit window in the plane feature's settings.