When creating curves in Rhino, I always have to do large corrections after creation because I do it like this:
- Enable osnap and place a point in 3d space away from the cplane
- Disable osnap and go into an orthogonal view
- Place a second point
The second point isn’t placed in the same plane as the first point, but rather on the cplane.
If the second point would be instead placed on the same plane as the first, along the corresponding ortho view, there would be far, far less corrections to be made on the control points of the curve.