Thrown when the gridlines are guaranteed to be parallel; check the
HasBeltMeasurement
property before using this property.
Remarks
On a conical surface, the distance between the radial gridlines is not constant. To interpret the Distance property, a circumferential gridline is taken as the “belt.” Distance is then measured along the belt. The BeltMeasurement property gives the location of the belt relative to the extremes of the surface. The belt is used whenever gridlines are not parallel. It defaults to 0.5.