ITPEC FE Morning October 2021 Question 24

Cutting away everything outside a window and keeping the part inside — clipping limits drawing to the visible region.

A window (or view volume in 3D) is defined over the display area. Objects fully outside it are discarded, objects crossing its edges are cut at the boundary, and only the visible part goes on to be drawn, which also saves processing.

Answer (b)

Why not others:

• •(a) — describes shading, which varies the brightness of surfaces by the light falling on them to give a 3D look
• •(c) — describes rendering, the final stage that turns the object data into the image shown on screen
• •(d) — describes anti-aliasing, which blends edge pixels to hide the jaggies caused by the pixel grid

Key rule: Clipping decides what is visible, shading how bright it is, anti-aliasing how smooth its edges are, and rendering turns it all into the final image.

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