The view matrix defines the position of the camera, that will look at the world, while the projection matrix will determine the way it looks at it. protected void SetLineVerticles () { lines = new VertexPositionColor [ 6 ]; lines [ 0 ] = new VertexPositionColor ( new Vector3 (- 10 , 0 , 0 ), Color . Every two VertexPositionColor elements define two points that will be used to draw a line as well as the line color.