Visible triangle edges (when none are desired)

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
followed by the center point and each corner.

no lighting.

Can you show, how are you coloring above?

Just a single ::glColor4d call - lighting is disabled.

Blending ? Polygon smoothing ? You will have to show more of your code.

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!

May I know what driver are you using that is producing your problem!