I have a curved surface I would like to draw a rectagular
shape on but I can not get the points to line up alone the z axis
so it is a straight line. How do I get all the points to be alone
one axis. I tried to do that but the relationship was not allowed.
how do you take curvature out of a spline? any help would be
If you want control of the rectangle shape in the world
space, then I suggest you use a "projected curve" onto the surface.
If you are drawing a curve on surface you cannot make any relations
to the space "outside" the surface the curve is on. This is why you
cannot align the curve to any of the the "world" axis. Surface
space is really a two dimensional space determined by the surface
topology and defined by the directions "u and v", not xyz.