View source for FAQ/Clipping, Culling, and Visibility Testing

; [[Clipping]] : How do I tell if a vertex has been clipped or not?
: When an OpenGL primitive moves placing one vertex outside the window, suddenly the color or texture mapping is incorrect. What's going on?
: I know my geometry is inside the view volume. How can I turn off OpenGL's view-volume clipping to maximize performance?
:When I move the viewpoint close to an object, it starts to disappear. How can I disable OpenGL's zNear clipping plane?
; [[Occlusion Query]] : How do I perform occlusion or visibility testing?
; [[FAQ/Stencil Mask]] : How do I render to a nonrectangular viewport?
; [[Raster Position And Clipping]] : How do I draw glBitmap() or glDrawPixels() primitives that have an initial glRasterPos() outside the window's left or bottom edge?
; [[Scissor Test And Framebuffer Clearing]] : Why doesn't glClear() work for areas outside the scissor rectangle?
; [[Culling]] : How does face culling work? Why doesn't it use the surface normal?

[[Category:FAQ]]