IPA FE Subject A 2023 Question 5
A question IPA Japan published in 令和５年度 基本情報技術者試験 科目A 公開問題 問5, translated into English. ITPEC is based on the same exams.
Same question on ITPEC: Nov 2021 Q24
Which of the following is an explanation of clipping in 3D graphics processing?
Explanation
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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This question comes from the past questions IPA Japan publishes, translated into English by ITPEC Practice. ITPEC Practice is an independent study tool and is not affiliated with IPA or ITPEC. See the original paper (PDF) or Report an issue.