< Sorry, I'm not sure I understand this part...



Just after the Loft when you move this point on the left or on the right, form is redrawn in real time
But by eyes it's very difficult to see where the point is on the good position on this line at the exact middle of these 2 curvatures!
Just at the moment where the form is not more "pinched" but becomes "rounded"! so enlight this position point! :)

Not exactly like follow but when the curvature becomes inversed! so "flat" here! :)