Editing OpenGLTutorial1 (section)

===Quadrangle strips===
[[image:OG-Quadstrip.png]]

And a <code>QuadStrip</code> works as the <code>TriangleStrip</code>, only the window is 4 coordinates wide and steps 2 steps each time, so each new pair of coordinates attaches a new quadrangle to the last edge of the last quadrangle.

It is easier to understand what is going on when you see how the window is formed. Giving each coordinate a number, the QuadStrip is rendered as follows:
Coordinates 1, 2 and 4 are rendered as a triangle followed by coordinates 1, 3 and 4.
Next coordinates 3, 4 and 6 are rendered as a triangle followed by coordinates 3, 5 and 6.

Rendering continues for as many coordinates that can be formed by that pattern.