I am trying to panel a curved extrusion on 2 curved rails (Sweep2). The resulting polysurface has a dark isocurve in it that effectively breaks the polysurface into two parts which cannot be selected as one when using the paneling tools.
Is this a function of the complex curvatures? It is forced to insert this control iso curve?
I rebuilt my line Sweep2 Rails and made sure they were joined properly.
Isocurve can be seen towards the right of the model, cutting through it the short way.