New to Grasshopper, but after a few hours of videos, realize it is possibly the only way to extend HISTORY far enough to derive a surface tangent to a pipe, while modifying the two underlying curves.
So, I create a curve with 5 or 6 control points to get the shape eventually needed. To start with. I can just create it as a straight line along the x axis. Then I create a pipe around that curve. then I need to project another curve onto the pipe. The intersection of that projected curve on the surface of the pipe s where the tangent lines must begin. finally the tangent lines are lofted to create a surface that is ALWAYS tangent to the surface of the pipe.
Since this is my first Grashopper task, I figured I should ask for some pointers : )