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)