RE: [V8i VBA] Calculate bearing angle from North to a projected point perpendicular on a target element

[quote user="Jon Summers"]

What you're calculating is the angle between one implicit vector (North) and another vector that you construct from your two coordinates.  The North vector is, of course, constant...

Compute your vector from the coordinates and then use Matrix3dFromRotationBetweenVectors to find the angle (in Radians) between them.

[/quote]

Hi Jon, I hadn't considered them as vectors but you are correct.

I've been almost successful using the suggested method but I seem to be fighting against MicroStation's method of calculating angles. The values I calculate appear to be calculated CCW from North whereas I need them CW from north. As per the image in the first post, the angle I get for the top green line is 169.82839333113.

I found a formula which does guarantee the correct angle but wanted to check if there is something I can do to get the same values using Matrix3dFromRotationBetweenVectors.