\uc2dc\uc791\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n
\r\nuniform vec3 uResolution;\r\nuniform float uTime;\r\nuniform vec4 uMouse;\r\n\r\nvoid main() {\r\n ?\r\n}\r\n<\/pre>\n\ud504\ub808\uadf8\uba3c\ud2b8\uc758 uv \uc88c\ud45c\ub294 \uc88c\uce21\ud558\ub2e8\uc774 \uc6d0\uc810\uc778\ub370, \uc6d0\uc810\uc744 \ud654\uba74 \uc911\uc2ec\uc73c\ub85c \uc7a1\uae30 \uc704\ud574 \ub2e4\uc74c \ucf54\ub4dc\uac00 \ud544\uc694\ud558\ub2e4.<\/p>\n
\r\nvoid main() {\r\n vec2 uv = gl_FragCoord.xy \/ uResolution.xy;\r\n uv -= .5;\r\n uv.x *= uResolution.x \/ uResolution.y;\r\n\r\n float t = uTime; \/\/ \uadf8\ub0e5 \ud758\ub7ec\uac00\ub294 \uc2dc\uac04\uac12\r\n}\r\n<\/pre>\n\ud504\ub808\uadf8\uba3c\ud2b8\uc5d0\uc11c \ubb34\uc5b8\uac00\ub97c \uc758\ubbf8\uc788\uac8c \ud45c\ud604\ud558\uae30 \uc704\ud574\uc11c\ub294 \uadf8 \ubb34\uc5b8\uac00\uac00 \ud53d\uc140\uc5d0\uc11c \uc5bc\ub9c8\ub098 \ub5a8\uc5b4\uc838\uc788\ub294\uc9c0\uc758 \uac70\ub9ac\uac12\uc744 \ub9e4\uc6b0 \uc758\ubbf8\uc788\uac8c \uc0ac\uc6a9\ud55c\ub2e4. \uc774\ub97c \uc704\ud574 Ray\uac00 \ud544\uc694\ud55c\ub370, Ray\ub294 \uc2dc\uc791\uc810(ro)\uacfc \ubc29\ud5a5(rd)\uc774 \uc911\uc694\ud558\ub2e4.<\/p>\n
\r\nvoid main() {\r\n ..\r\n\r\n float t = uTime; \/\/ \uadf8\ub0e5 \ud758\ub7ec\uac00\ub294 \uc2dc\uac04\uac12\r\n\r\n \/\/ Left-Hand (Z\ucd95\uc740 \ubaa8\ub2c8\ud130\uc5d0\uc11c \uc0ac\ub78c\uc744 \ud5a5\ud558\ub294 \ubc29\ud5a5\uc774 \ub9c8\uc774\ub108\uc2a4\uc784)\r\n vec3 ro = vec3(3. * sin(t), 1., -3. * cos(t)); \/\/ Ray\uc758 \uc2dc\uc791\uc810(\uce74\uba54\ub77c\uc758 \uc704\uce58), \uc77c\ub2e8 \uc2dc\uac04\uc5d0 \ub530\ub77c Y\ucd95\uc73c\ub85c \ud68c\uc804\uc2dc\ucf1c\ubcf8\ub2e4.\r\n}\r\n<\/pre>\nRay\uc758 \uc2dc\uc791\uc810\uc778 ro\ub294 \ubcf4\uc774\ub294\ub370, \ubc29\ud5a5\uc778 rd\ub294 \uc544\uc9c1 \ubcf4\uc774\uc9c0 \uc54a\ub294\ub2e4. rd\ub97c \uc815\ud558\uae30 \uc704\ud574 \uce74\uba54\ub77c \uac1c\ub150\uc744 \uc774\uc6a9\ud55c\ub2e4.<\/p>\n
\r\nvoid main() {\r\n ...\r\n\r\n vec3 ro = vec3(3. * sin(t), 1., -3. * cos(t)); \/\/ Ray\uc758 \uc2dc\uc791\uc810(\uce74\uba54\ub77c\uc758 \uc704\uce58), \uc77c\ub2e8 \uc2dc\uac04\uc5d0 \ub530\ub77c Y\ucd95\uc73c\ub85c \ud68c\uc804\uc2dc\ucf1c\ubcf8\ub2e4.\r\n\r\n vec3 lookAt = vec3(.0); \/\/ \uce74\uba54\ub77c\uac00 \ubc14\ub77c\ubcf4\ub294 \uc9c0\uc810\r\n vec3 f = normalize(lookAt - ro); \/\/ \uce74\uba54\ub77c\uac00 \ubc14\ub77c\ubcf4\ub294 \ubc29\ud5a5 \ubca1\ud130\r\n vec3 u = vec3(0,1,0); \/\/ \uce74\uba54\ub77c\uc758 Up \ubca1\ud130 \r\n vec3 r = normalize(cross(u, f)); \/\/ \uce74\uba54\ub77c\uc758 Right \ubca1\ud130 \r\n\r\n float zoom = 1.; \/\/ \ud655\ub300 \ubc30\uc728\r\n vec3 c = ro + f * zoom;\r\n vec3 i = c + uv.x * r + uv.y * u; \/\/ \uad50\ucc28\ud558\ub294 \uc9c0\uc810\r\n\r\n vec3 rd = normalize(i - ro); \/\/ Ray\uc758 \ubc29\ud5a5 \ubca1\ud130\r\n<\/pre>\n\uc774\uc81c \uc815\uc721\uba74\uccb4\uc758 \uad6c\uc131 \uc815\uc810 8\uac1c\ub97c \ud504\ub808\uadf8\uba3c\ud2b8\uc5d0 \uc2dc\uac01\ud654\ud558\uae30\ub9cc \ud558\uba74 \ub41c\ub2e4.<\/p>\n
\r\nvoid main() {\r\n ...\r\n\r\n vec3 rd = normalize(i - ro); \/\/ Ray\uc758 \ubc29\ud5a5 \ubca1\ud130\r\n\r\n float d = 0.; \r\n float off = .5;\r\n d += drawPoint(ro, rd, vec3(0.-off, 0.-off, 0.-off));\r\n d += drawPoint(ro, rd, vec3(0.-off, 0.-off, 1.-off));\r\n d += drawPoint(ro, rd, vec3(0.-off, 1.-off, 0.-off));\r\n d += drawPoint(ro, rd, vec3(0.-off, 1.-off, 1.-off));\r\n d += drawPoint(ro, rd, vec3(1.-off, 0.-off, 0.-off));\r\n d += drawPoint(ro, rd, vec3(1.-off, 0.-off, 1.-off));\r\n d += drawPoint(ro, rd, vec3(1.-off, 1.-off, 0.-off));\r\n d += drawPoint(ro, rd, vec3(1.-off, 1.-off, 1.-off));\r\n\r\n gl_FragColor = vec4(d);\r\n}\r\n<\/pre>\ndrawPoint\ub294 \ud3ec\uc778\ud2b8\ub97c \uadf8\ub9ac\ub294 \ud568\uc218\uc774\uace0 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n
\r\nfloat drawPoint(vec3 ro, vec3 rd, vec3 p) {\r\n float d = distLine(ro, rd, p);\r\n d = smoothstep(.04, .03, d);\r\n return d;\r\n}\r\n<\/pre>\ndistLine\uc740 ro\uc640 rd\ub85c \uc815\uc758\ub418\ub294 Ray\uc5d0\uc11c \ud504\ub85c\uadf8\uba3c\ud2b8 \uc88c\ud45c \uac04\uc758 \uac70\ub9ac\ub97c \uc5bb\ub294 \ud568\uc218\uc778\ub370 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n
\r\nfloat distLine(vec3 ro, vec3 rd, vec3 p) {\r\n return length(cross(p - ro, rd)) \/ length(rd);\r\n}\r\n<\/pre>\n\ub05d.<\/p>\n