hi, i dont know if it is an opengl question, or an mfc question, but i ran into a little big problem. my application consists three viewports, top/side/perspective. but when i want to draw a grid, the coordinates of the lines, are the screen coordinats, so if i size it down, the lines are to close to each other, is there any way around this, or i should change the spacing between the lines mnualy based on the screen size? the smae happs with the 3d opengl screen, if the screen isnt big enough for the primitives, nothing will be drawn, instead of just parts of it. should i glEnable some sort of clipping algorithm? what else can i do?