So now I just I need how to get fill in the circle. When I used the glBegin (GL_Polygon) in place of GL_LINE_LOOP i got black fill. Why? How I can use any other fill. As there are two items. One circle ring: with the fill of inclined lines under the 45. The other one I need to fill the rectangle with more complex pattern with some ingraned pattern despite in 2d. Can i define some pattern in drawing editor and them use and upload for opengl fill? How to do it if possible, at least with predefined?