Drag the compass and place it on the surface to
which you want to align the segment.
2.
Bring up the Definition dialog box
for the run.
3.
Bring up the Definition dialog box
again, this time for the segment half you are interested in. See note
below.
Each segment is divided into two
halves, which become visible when you bring up the Definition dialog box
for the run. It is important to select the correct half, because the
segment will pivot at the node closest to the segment half you select.
4.
Click on the Compass Base Plane
button. The
segment will pivot - at the node closest to the segment half you selected -
to become parallel with the reference plane.
In the illustration above, the portion in red was the segment half
selected. If the half to the left of it had been selected then the segment
would have pivoted at the node to the left of it, as shown below.