I’m drawing a simple tri strip but for some reason there is a faint visible outline of the triangles. The drawing code is about as simple as you can get, just a
::glBegin(GL_TRIANGLE_FAN);
followed by the center point and each corner.
Polygon smoothing of course - when I disable it the lines go away. It was turned on someplace else in the code (of course) painful that its smoothing the interior edges, but I seem to remember that being driver specific – many thanks!