LTAN, NL1, P3, XV3, YV3, ZV3
Generates a line at the end of, and tangent to, an existing line.
NL1Number of the line the generated line is tangent to. If negative,
assume P1 (see below), instead of P2, is the second keypoint of line NL1.
If NL1 = P, graphical picking is enabled and all
remaining command fields are ignored (valid only in the GUI).
P3Keypoint at which generated line must end.
The following fields are used only if a specified slope on the end of
the new line is desired, otherwise a zero curvature end slope will be automatically
calculated. To specify the end slope, use the following fields to define
a "slope vector" that has its tail at the origin and its head at the point XV, YV, ZV in the active coordinate system [CSYS].
The corresponding end slope of the line will then be parallel to this "slope
vector."
XV3, YV3, ZV3Location (in the active coordinate system) of the head of
the "slope vector" corresponding to the slope at the P3 end
of the line. The tail of the vector is at the coordinate system origin.