Add Polygon
Function description: Add polygonal model.
Steps
1.Select the custom model layer to be drawn in the directory tree, click Add Model-Add Polygon
button.
2.Left-click to draw the polygon and double-click to complete the drawing.
3.The height of the model is determined by the straight line formed by the last point of the polygon along the direction perpendicular to the datum and the point closest to the mouse pointer.
4.Click to finish drawing the polygon.
