{"id":14159,"date":"2023-10-11T11:09:32","date_gmt":"2023-10-11T02:09:32","guid":{"rendered":"http:\/\/www.gisdeveloper.co.kr\/?p=14159"},"modified":"2025-02-24T12:24:40","modified_gmt":"2025-02-24T03:24:40","slug":"dfdx%ec%99%80-dfdy%eb%a5%bc-%ec%9d%b4%ec%9a%a9%ed%95%9c-%eb%b2%95%ec%84%a0-%eb%b2%a1%ed%84%b0-%ea%b3%84%ec%82%b0","status":"publish","type":"post","link":"http:\/\/www.gisdeveloper.co.kr\/?p=14159","title":{"rendered":"dFdx\uc640 dFdy\ub97c \uc774\uc6a9\ud55c \ubc95\uc120 \ubca1\ud130 \uacc4\uc0b0"},"content":{"rendered":"

\ubc84\ud14d\uc2a4 \uc250\uc774\ub354\uc5d0\uc11c \uc815\uc810\uc744 \ud754\ub4e4\uc5c8\uc744 \uacbd\uc6b0 \ubc95\uc120 \ubca1\ud130 \uc5ed\uc2dc \ub2e4\uc2dc \uacc4\uc0b0\uc744 \ud574\uc918\uc57c \ud558\ub294\ub370, \uc774\ub54c \uc815\uc810\uc758 x\uc640 y\uc5d0 \ub300\ud55c \ud3b8\ubbf8\ubd84 \uac12\uc744 \uc5bb\uc744 \uc218 \uc788\ub294 dFdx\uc640 dFdy\ub97c \uc774\uc6a9\ud558\uba74 \ubc95\uc120 \ubca1\ud130\ub97c \uc5bb\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

\uc774\ub7f0 \uacbd\uc6b0 \ubc84\ud14d\uc2a4 \uc250\uc774\ub354\uc5d0 \uc804\ub2ec\ub41c normal\uc744 vary\ub97c \ud1b5\ud574 \ud504\ub808\uadf8\uba3c\ud2b8 \uc250\uc774\ub354\ub85c \uc804\ub2ec\ud560 \ud544\uc694\uac00 \uc5c6\uace0 \ud504\ub808\uadf8\uba3c\ud2b8 \uc250\uc774\ub354\uc5d0\uc11c \ubc95\uc120 \ubca1\ud130\ub97c \uacc4\uc0b0\ud574 \uc8fc\uba74 \ub418\ub294\ub370, \ud504\ub808\uadf8\uba3c\ud2b8 \uc250\uc774\ub354\uc5d0\uc11c \uc774\uc5d0 \ub300\ud55c \ucf54\ub4dc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n

\r\nvec3 normal = normalize(\r\n    cross(\r\n        dFdx(vPosition.xyz),\r\n        dFdy(vPosition.xyz)\r\n    )\r\n);\r\n<\/pre>\n
\uc704\uc758 vPosition\uc740 \ubc84\ud14d\uc2a4 \uc250\uc774\uc774\ub354\uc5d0\uc11c \uc7ac\uacc4\uc0b0\ub41c \uc815\uc810\uc778\ub370, \ubc84\ud14d\uc2a4 \uc250\uc774\ub354\uc758 \ucf54\ub4dc\uc5d0\uc11c \ubcf4\uba74 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n
\r\nvarying vec3 vPosition;\r\n\r\nvoid main() {\t\r\n    vec3 posClone = position;\r\n    posClone = \/* \uc815\uc810 \ud754\ub4e4\uae30(\ubcc0\uacbd) *\/\r\n    \r\n    ...\r\n\r\n    vPosition = modelMatrix * vec4(posClone, 1.0)).xyz;\r\n\r\n    ...\r\n}\r\n<\/pre>\n
\uc801\uc6a9 \uacb0\uacfc\ub85c \ube44\uad50\ud558\uba74 \uba3c\uc800 dFdx\uc640 dFdy\ub97c \ud1b5\ud55c \ubc95\uc120 \ubca1\ud130\ub97c \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uace0 \uc9c0\uc624\uba54\ud2b8\ub9ac\ub97c \ud1b5\ud574 \uc81c\uacf5\ub418\ub294 \ubc95\uc120 \ubca1\ud130\ub97c \uadf8\ub300\ub85c \uc0ac\uc6a9\ud55c \uacbd\uc6b0\ub294 \uc544\ub798\uc640 \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n
\"\"<\/p>\n
\ubc84\ud14d\uc2a4 \uc250\uc774\ub354\uc5d0\uc11c \uc815\uc810\uc744 \ud754\ub4e4\uc5b4\uc11c \uc6d0\ub798 \uc81c\uacf5\ub41c \ubc95\uc120 \ubca1\ud130\uac00 \ub9de\uc9c0 \uc54a\uc544 \uc74c\uc601 \ud6a8\uacfc\uac00 \uc81c\ub300\ub85c \ud45c\ud604\ub418\uc9c0 \uc54a\ub294\ub370, \uc774\ub97c \uac1c\uc120\ud558\uae30 \uc704\ud574 dFdx\uc640 dFdy\ub97c \ud1b5\ud55c \ubc95\uc120 \ubca1\ud130\ub97c \uc0ac\uc6a9\ud55c \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n
\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"
\ubc84\ud14d\uc2a4 \uc250\uc774\ub354\uc5d0\uc11c \uc815\uc810\uc744 \ud754\ub4e4\uc5c8\uc744 \uacbd\uc6b0 \ubc95\uc120 \ubca1\ud130 \uc5ed\uc2dc \ub2e4\uc2dc \uacc4\uc0b0\uc744 \ud574\uc918\uc57c \ud558\ub294\ub370, \uc774\ub54c \uc815\uc810\uc758 x\uc640 y\uc5d0 \ub300\ud55c \ud3b8\ubbf8\ubd84 \uac12\uc744 \uc5bb\uc744 \uc218 \uc788\ub294 dFdx\uc640 dFdy\ub97c \uc774\uc6a9\ud558\uba74 \ubc95\uc120 \ubca1\ud130\ub97c \uc5bb\uc744 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub7f0 \uacbd\uc6b0 \ubc84\ud14d\uc2a4 \uc250\uc774\ub354\uc5d0 \uc804\ub2ec\ub41c normal\uc744 vary\ub97c \ud1b5\ud574 \ud504\ub808\uadf8\uba3c\ud2b8 \uc250\uc774\ub354\ub85c \uc804\ub2ec\ud560 \ud544\uc694\uac00 \uc5c6\uace0 \ud504\ub808\uadf8\uba3c\ud2b8 \uc250\uc774\ub354\uc5d0\uc11c \ubc95\uc120 \ubca1\ud130\ub97c \uacc4\uc0b0\ud574 \uc8fc\uba74 \ub418\ub294\ub370, \ud504\ub808\uadf8\uba3c\ud2b8 \uc250\uc774\ub354\uc5d0\uc11c \uc774\uc5d0 \ub300\ud55c \ucf54\ub4dc\ub294 … <\/p>\n
\ub354 \ubcf4\uae30 “dFdx\uc640 dFdy\ub97c \uc774\uc6a9\ud55c \ubc95\uc120 \ubca1\ud130 \uacc4\uc0b0”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,153,145,139,1],"tags":[],"class_list":["post-14159","post","type-post","status-publish","format-standard","hentry","category-opengl","category-shader","category-three-js","category-webgl","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/14159","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=14159"}],"version-history":[{"count":8,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/14159\/revisions"}],"predecessor-version":[{"id":14161,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/14159\/revisions\/14161"}],"wp:attachment":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=14159"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14159"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14159"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}