How do I make a curve like the red colour in grasshopper.
Hi,
what about something like this? I assume that both ending parts of the red curve need to be tangent to the green ones, right? 
Hope it helps!
Bezier curve.gh (8.7 KB)
1 Like
What if my two curves are not planar
The Bezier Span can also work with none planar curves.
Bezier curve.gh (13.4 KB)
Do you have something in mind for the non planar curves?
Otherwise, another way of doing it would be connecting the curves with a straight line that you would “deconstruct” later by dividing it into multiple points and readjust the x, y or z values with a Graph Mapper/Remap.