<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (August 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (August 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> Clipping, in the context of computer graphics, is a method to selectively enable or disable rendering operations within a defined region of interest . Mathematically, clipping can be described using the terminology of constructive geometry . A rendering algorithm only draws pixels in the intersection between the clip region and the scene model . Lines and surfaces outside the view volume (aka . frustum) are removed . </P> <P> Clip regions are commonly specified to improve render performance . A well - chosen clip allows the renderer to save time and energy by skipping calculations related to pixels that the user cannot see . Pixels that will be drawn are said to be within the clip region . Pixels that will not be drawn are outside the clip region . More informally, pixels that will not be drawn are said to be "clipped ." </P>

What do you mean by clipping in computer graphics