3d ๋ฐฐ๊ฒฝ์— 2d ์บ๋ฆญํ„ฐ ๋‚˜์˜ค๋Š” ๊ฒŒ์ž„ ์ œ์ž‘ํ•˜๋ ค๋Š”๋ฐ ๊ฒŒ์ž„๋ฉ”์ด์ปค๋กœ ์ถฉ๋ถ„ํžˆ ๊ฐ€๋Šฅ?