#### Retrolinear Only for Location Dimensions

This check box is available when dimensioning vector and surface points. When the retrolinear only option has been selected for valid points, the location axes are calculated by:

· Finding the largest component of the theoretical surface normal vector (largest in x, y, or z direction).

· Projecting the measured point to this largest component vector in a manner that the projection is perpendicular to the original theoretical surface normal vector.

The location axes are then calculated from this new projected point.

A - Actual Measured Point

B - Theoretical Point

C - Theo Surface Normal Vector

D - Largest component of the Theo Surface Normal Vector

E - Projected Point (reported point)