{"id":853,"date":"2009-02-07T02:57:32","date_gmt":"2009-02-07T02:57:32","guid":{"rendered":"http:\/\/www.gisdeveloper.co.kr\/?p=853"},"modified":"2017-01-29T10:17:16","modified_gmt":"2017-01-29T01:17:16","slug":"%ea%b5%acsphere%ec%99%80-%ed%8e%b8%ec%84%a0%e5%81%8f%e7%b7%9a-ray%ec%9d%98-%ea%b5%90%ec%b0%a8","status":"publish","type":"post","link":"http:\/\/www.gisdeveloper.co.kr\/?p=853","title":{"rendered":"\uad6c(Sphere)\uc640 \ud3b8\uc120(\u504f\u7dda, Ray)\uc758 \uad50\ucc28"},"content":{"rendered":"<p>\uc2dc\uc791\uc810\uc5d0\uc11c \uc5b4\ub5a4 \ubc29\ud5a5\uc73c\ub85c \ubb34\ud55c\ud788 \ubed7\uc5b4 \ub098\uac00\ub294 \uc120\uc744 \ud3b8\uc120(Ray)\uc774\ub77c\uace0\ud558\uc790. \u00a0\uc2dc\uc791\uc810 p\uc640 \ubc29\ud5a5\ubca1\ud130 d\ub85c \uc815\uc758\ub41c \ud3b8\uc120\uc774 \uc788\uc744\ub54c, \uc774 \ud3b8\uc120\uc774 \uad6c(Sphere)\uc640 \uad50\ucc28\ud558\ub294\uc9c0 \ud655\uc778\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc0dd\uac01\ud574\ubcf4\uc790. \uad50\ucc28\ud55c\ub2e4\uba74 \uad50\ucc28\uc810\uc740 \ud558\ub098 \uc778\uac00, \uc544\ub2c8\uba74 \ub450\uac1c\uc778\uac00? \uc544\ub798\uc758 \uadf8\ub9bc\uc740 \uc5ec\uac1c\uc758 \uc0c1\ud669\uc744 \ubcf4\uc5ec\uc900\ub2e4.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1124623054.jpg\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" width=\"451\" height=\"210\" \/><br \/>\n\uccab\ubc88\uc9f8 \uc9c8\ubb38\uc740 \ud3b8\uc120\uacfc \uad6c\uac00 \uad50\ucc28\ud558\ub294\uc9c0\uc758 \uc5ec\ubd80\uc778\ub370, \uc774\ub97c \uc704\ud574\uc11c \uad6c\uc758 \uc911\uc2ec\uc810\uc5d0\uc11c \ud3b8\uc120\uae4c\uc9c0\uc758 \uac70\ub9ac\ub97c \uad6c\ud574\uc57c\ub9cc \ud55c\ub2e4. \ub9cc\uc57d \uadf8 \uac70\ub9ac\uac00 \uad6c\uc758 \ubc18\uc9c0\ub984\ubcf4\ub2e4 \ud06c\ub2e4\uba74 \uad50\ucc28\ud558\uc9c0 \uc54a\ub294\ub2e4\uace0 \ud560 \uc218 \uc788\ub2e4.<\/p>\n<p>\uac70\ub9ac\ub97c \uad6c\ud558\uae30 \uc704\ud574, 2\uac00\uc9c0 \uacbd\uc6b0\ub97c \uace0\ub824\ud574\uc57c \ud558\ub294\ub370&#8230; \uad6c\uc758 \uc911\uc2ec\uc810\uc774 \ud3b8\uc120\uc5d0 \ud22c\uc601\ub418\ub294\uc9c0 \ud22c\uc601\ub418\uc9c0 \uc54a\ub294\uc9c0\uc774\ub2e4. \uc774\ub294 \ub0b4\uc801\uc744 \ud1b5\ud574 \uc54c \uc218 \uc788\ub2e4.<\/p>\n<p>\uad6c\uc758 \uc911\uc2ec\uc810\uc744 c\ub77c\uace0 \ud558\uace0, p\uc5d0\uc11c c\uae4c\uc9c0 \uac00\ub294 \ubca1\ud130\ub97c v\ub77c\uace0 \ud558\uc790.\u00a0 \uadf8\ub807\ub2e4\uba74 \ub9cc\uc57d&#8230;&#8230;.<\/p>\n<ul>\n<li><strong>d \u2219 v<\/strong> &gt; 0 \uc774\uba74 \ud22c\uc601\ub418\ubbc0\ub85c \uac70\ub9ac\ub97c \uad6c\ud560 \uc218 \uc788\ub2e4\ub294 \uac83\uc774\uace0<\/li>\n<li><strong>d \u2219 v<\/strong> &lt;= 0 \uc774\uba74 \ud3b8\uc120 \ub4a4\uc5d0 \uad6c\uac00 \uc788\uc5b4 \ud22c\uc601\ub418\uc9c0 \uc54a\uc544 \uac70\ub9ac\ub97c \uad6c\ud560 \uc218 \uc5c6\ub2e4\ub294 \uac83\uc774\ub2e4.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1094798867.jpg\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" width=\"397\" height=\"181\" \/><br \/>\n\uc704\uc758 \ub450 \uacbd\uc5d0 \ub300\ud574\uc11c \ud3b8\uc120\uacfc \uad6c\uc640\uc758 \uad50\ucc28\uc5d0 \ub300\ud574 \uc0b4\ud3b4\ubcf4\ub3c4\ub85d \ud558\uc790.<\/p>\n<p><strong><span style=\"font-size: medium;\">\uad6c\uc758 \uc911\uc2ec\uc810\uc774 \ud3b8\uc120\uc5d0 \ud22c\uc601\ub420 \uacbd\uc6b0<br \/>\n<\/span><\/strong><br \/>\n\uc544\ub798\uc758 \uadf8\ub9bc\uc740 \ud22c\uc601\ub420 \uacbd\uc6b0\uc5d0 \ub300\ud574\uc11c \uac00\ub2a5\ud55c 3\uac00\uc9c0 \uacbd\uc6b0\uc774\ub2e4. \uad6cA\ub294 \uad50\ucc28\ud558\uc9c0 \uc54a\ub294 \uac83\uc774\uace0, \uad6cB\ub294 \ud55c \uc810\uc5d0\uc11c\ub9cc \uad50\ucc28\ud558\uace0 \uad6cC\ub294 2\uc810\uc5d0\uc11c \uad50\ucc28\ud55c\ub2e4.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1116775005.jpg\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" width=\"494\" height=\"316\" \/><br \/>\n\ud3b8\uc120 \uc704\uc5d0 \uad6c\uc758 \uc911\uc2ec\uc810\uc758 \ud22c\uc601\uc744 \uacc4\uc0b0\ud574\ubcf4\uc790. pc\ub97c \ud22c\uc601\ub41c \uc810\uc774\ub77c\uace0 \ud558\uba74, \uad6cA\uc5d0 \ub300\ud55c \ud3b8\uc120 \uc704\uc758 \ud22c\uc601\uc810\uc740 pcA\uc774\uace0 \uad6cB\uc5d0 \ub300\ud55c \uac83\uc740 pcB, \uad6cC\uc5d0 \ub300\ud55c \uac83\uc740 pcC\uac00 \ub41c\ub2e4. pc\uc5d0\uc11c \uad6c\uc758 \uc911\uc2ec\uc810\uae4c\uc9c0\uc758 \uac70\ub9ac\uac00 \uad6c\uc758 \ubc18\uc9c0\ub984\ubcf4\ub2e4 \ud06c\ub2e4\uba74 \uad50\ucc28\ud558\uc9c0 \uc54a\ub294 \uac83\uc774\uace0 \uad6cA\uac00 \uadf8\ub807\ub2e4. pc\uc5d0\uc11c \uad6c\uc758 \uc911\uc2ec\uc810\uae4c\uc9c0\uc758 \uac70\ub9ac\uac00 \uad6c\uc758 \ubc18\uc9c0\ub984\uacfc \uac19\ub2e4\uba74 \ud55c\uc810\uc5d0\uc11c \ub9cc\ub098\ub294 \uac83\uc774\uace0 \uad6cB\uac00 \uadf8 \uacbd\uc6b0\uc774\uace0 \uad50\ucc28\uc810\uc740 \uc810 pc\uc774\ub2e4.<\/p>\n<p>\uad6cC\uc5d0 \ub300\ud55c \uacbd\uc6b0\ub294 \ubc18\uc9c0\ub984\ubcf4\ub2e4 \uadf8 \uac70\ub9ac\uac00 \uc791\uc740 \uacbd\uc6b0\uc774\uace0 2\uac1c\uc758 \uad50\ucc28\uc810\uc774 \uc874\uc7ac\ud558\uba70 \uc774 2\uac1c\uc758 \uad50\ucc28\uc810\uc744 \uad6c\ud558\uae30 \uc704\ud574\uc11c\ub294 \uc880\ub354 \uc0dd\uac01\uc744 \ud574\uc57c \ud558\ub294\ub370&#8230; \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1208160981.jpg\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" width=\"354\" height=\"223\" \/><br \/>\n\uba3c\uc800 \uc810 pc\ub294 \ub0b4\uc801\uc744 \uc774\uc6a9\ud55c \ud22c\uc601\uc744 \ud1b5\ud574 \uad6c\ud560 \uc218 \uc788\ub2e4. \ud22c\uc601\ubc95\uc740 \uc774 \ube14\ub85c\uadf8\uc758 \ud22c\uc601\uc5d0 \uad00\ud55c \uae00\uc744 \ucc38\uc870\ud558\uae30 \ubc14\ub780\ub2e4. \uadf8\ub9ac\uace0 \ub450\uac1c\uc758 \uad50\ucc28\uc810\uc744 i1, i2\ub77c\uace0 \ud558\uc790. \ub2e4\uc74c\uc758 \uacfc\uc815\uc744 \ud1b5\ud574 i1\uc744 \uc5bb\uc744 \uc218 \uc788\ub2e4.<\/p>\n<p>p\uc5d0\uc11c i1\uae4c\uc9c0 \uac70\ub9ac\ub97c \uc54c\uace0 \uc788\ub2e4\uace0 \uac00\uc815\ud558\uba74, \uc774 \uac70\ub9ac\ub97c di1\uc774\ub77c\uace0 \ud558\uace0 i1\uc740 \ub2e4\uc74c \uacf5\uc2dd\uc744 \ud1b5\ud574 \uad6c\ud560 \uc218 \uc788\ub2e4.<\/p>\n<div style=\"text-align: center;\"><strong><span style=\"font-size: medium;\">i1 = p + d * di1<br \/>\n<\/span><\/strong><\/div>\n<p>\uc704\uc758 \uacf5\uc2dd\uc5d0\uc11c p\uc640 d\ub294 \uc774\ubbf8 \uc54c\uace0 \uc788\uc73c\ubbc0\ub85c, di1\uc744 \uad6c\ud558\ub294 \uac83\ub9cc \ub0a8\uac8c \ub41c\ub2e4. \uc810i1, pc, c\ub85c \uad6c\uc131\ub41c \uc0bc\uac01\ud615\uc774 \uc9c1\uac01\uc0bc\uac01\ud615\uc774\ubbc0\ub85c, \ud53c\ud0c0\uace0\ub77c\uc2a4(Pythagorean) \uacf5\uc2dd\uc744 \uc801\uc6a9\ud574\ubcf4\uba74, \uc0bc\uac01\ud615\uc758 \ubcc0\uc758 \uae38\uc774\ub97c a,b,c\ub77c\uace0 \ud560\ub54c&#8230;<\/p>\n<ul>\n<li>a = |c &#8211; i1| = \uad6c\uc758 \ubc18\uc9c0\ub984\uac12<\/li>\n<li>b = |pc &#8211; c|<\/li>\n<li>c = |pc &#8211; i1|<\/li>\n<\/ul>\n<p>\uc704\uc5d0\uc11c \uc624\uc9c1 \uae38\uc774 c\ub9cc\uc774 \ubbf8\uc9c0\uc218\uc774\uba70, \uae38\uc774 c\ub294 \ub2e4\uc74c\ucc98\ub7fc \uacc4\uc0b0\ud560 \uc218 \uc788\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<div style=\"text-align: center;\"><strong><span style=\"font-size: medium;\">c^2 = a^2 &#8211; b^2<\/span><\/strong><\/div>\n<p>\uadf8\ub9bc\uc744 \ud1b5\ud574 di1\uc740 \ub2e4\uc74c\uacfc \uac19\uc74c\uc744 \uc54c\uc218\uc788\ub2e4.<\/p>\n<div style=\"text-align: center;\"><strong><span style=\"font-size: medium;\">di1 = |pc &#8211; p| &#8211; c<br \/>\n<\/span><\/strong><\/div>\n<p>\uc55e\uc11c \uacc4\uc0b0\ud55c di1\uc740 \ud3b8\uc120\uc758 \uc2dc\uc791\uc810(p)\uac00 \uad6c\uc758 \ub0b4\ubd80\uc5d0 \uc788\uc9c0 \uc54a\ub2e4\uace0 \uac00\uc815\ud55c \uac83\uc774\ub2e4. \ub9cc\uc57d p\uac00 \uad6c \uc548\ucabd\uc5d0 \uc788\ub2e4\uba74 di1\uc5d0 \ub300\ud55c \uacc4\uc0b0\uc740 \uc544\ub798\ucc98\ub7fc \ub2ec\ub77c\uc9c4\ub2e4.<\/p>\n<div style=\"text-align: center;\"><span style=\"font-size: medium;\"><strong>di1 = |pc &#8211; p| + c<\/strong><\/span><\/div>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1194816293.jpg\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" width=\"457\" height=\"274\" \/><br \/>\n<strong><span style=\"font-size: medium;\">\uad6c\uc758 \uc911\uc2ec\uc810\uc774 \ud3b8\uc120\uc5d0 \ud22c\uc601\ub418\uc9c0 \uc54a\ub294 \uacbd\uc6b0<\/span><\/strong><\/p>\n<p>\uad6c\uc758 \uc911\uc2ec\uc810\uc774 \ud3b8\uc120\uc5d0 \ud22c\uc601\ub418\uc9c0 \uc54a\ub294 \uacbd\uc6b0, \ud3b8\uc120\uc758 \uc2dc\uc791\uc810\uc774 \uad6c\uc758 \uc678\ubd80\uc5d0 \uc704\uce58\ud55c\ub2e4\uba74 \ud3b8\uc120\uacfc \uad6c\uac00 \uad50\ucc28\ud558\uc9c0 \uc54a\ub294\ub2e4\ub294 \uac83\uc774\ub2e4. \ubc18\uba74\uc5d0&#8230; \ud3b8\uc120\uc758 \uc2dc\uc791\uc810 p\uc640 \uad6c\uc758 \uc911\uc2ec\uc810 c\uae4c\uc9c0\uc758 \uac70\ub9ac\uac00 \uad6c\uc758 \ubc18\uc9c0\ub984\uacfc \uc791\uac70\ub098 \uac19\ub2e4\uba74 \uad50\ucc28\uc810\uc774 \uc874\uc7ac\ud55c\ub2e4. \uac19\ub2e4\uba74 p \uc790\uccb4\uac00 \uad50\ucc28\uc810\uc774\ub2e4.<\/p>\n<p>\ud3b8\uc120\uc758 \uc2dc\uc791\uc810\uc774 \uad6c\uc758 \ub0b4\ubd80\uc5d0 \uc704\uce58\ud55c\ub2e4\uba74, \uc55e\uc758 \uad6c\uc758 \uc911\uc12c\uc810\uc774 \ud3b8\uc120\uc5d0 \ud22c\uc601\ub418\ub294 \uacbd\uc6b0\uc640 \uac19\uc740 \ubc29\ubc95\uc744 \uc801\uc6a9\ud558\uc5ec \uad50\ucc28\uc810\uc744 \uad6c\ud560 \uc218 \uc788\ub2e4. \uc544\ub798 \uadf8\ub9bc\uc744 \uc0b4\ud3b4\uba74&#8230;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1027685737.jpg\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" width=\"396\" height=\"289\" \/><br \/>\npc\uc5d0\uc11c i1\uae4c\uc9c0\uc758 \uac70\ub9ac \uacc4\uc0b0\uc740 \uc55e\uc5d0\uc11c \ubcf8 \uac83\uacfc \ub3d9\uc77c\ud558\ub2e4. \uac70\ub9ac\ub97c dist\ub85c \ub193\uace0.. di1\uc740 \ub2e4\uc74c\ucc98\ub7fc \uacc4\uc0b0\ud560 \uc218 \uc788\ub2e4.<\/p>\n<div style=\"text-align: center;\"><strong><span style=\"font-size: medium;\">di1 = dist &#8211; | pc &#8211; p |<br \/>\n<\/span><\/strong><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uc2dc\uc791\uc810\uc5d0\uc11c \uc5b4\ub5a4 \ubc29\ud5a5\uc73c\ub85c \ubb34\ud55c\ud788 \ubed7\uc5b4 \ub098\uac00\ub294 \uc120\uc744 \ud3b8\uc120(Ray)\uc774\ub77c\uace0\ud558\uc790. \u00a0\uc2dc\uc791\uc810 p\uc640 \ubc29\ud5a5\ubca1\ud130 d\ub85c \uc815\uc758\ub41c \ud3b8\uc120\uc774 \uc788\uc744\ub54c, \uc774 \ud3b8\uc120\uc774 \uad6c(Sphere)\uc640 \uad50\ucc28\ud558\ub294\uc9c0 \ud655\uc778\ud558\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc0dd\uac01\ud574\ubcf4\uc790. \uad50\ucc28\ud55c\ub2e4\uba74 \uad50\ucc28\uc810\uc740 \ud558\ub098 \uc778\uac00, \uc544\ub2c8\uba74 \ub450\uac1c\uc778\uac00? \uc544\ub798\uc758 \uadf8\ub9bc\uc740 \uc5ec\uac1c\uc758 \uc0c1\ud669\uc744 \ubcf4\uc5ec\uc900\ub2e4. \uccab\ubc88\uc9f8 \uc9c8\ubb38\uc740 \ud3b8\uc120\uacfc \uad6c\uac00 \uad50\ucc28\ud558\ub294\uc9c0\uc758 \uc5ec\ubd80\uc778\ub370, \uc774\ub97c \uc704\ud574\uc11c \uad6c\uc758 \uc911\uc2ec\uc810\uc5d0\uc11c \ud3b8\uc120\uae4c\uc9c0\uc758 \uac70\ub9ac\ub97c \uad6c\ud574\uc57c\ub9cc \ud55c\ub2e4. \ub9cc\uc57d \uadf8 \uac70\ub9ac\uac00 \uad6c\uc758 \ubc18\uc9c0\ub984\ubcf4\ub2e4 \ud06c\ub2e4\uba74 \uad50\ucc28\ud558\uc9c0 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/www.gisdeveloper.co.kr\/?p=853\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;\uad6c(Sphere)\uc640 \ud3b8\uc120(\u504f\u7dda, Ray)\uc758 \uad50\ucc28&#8221;<\/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":[9],"tags":[39],"class_list":["post-853","post","type-post","status-publish","format-standard","hentry","category-algorithms","tag-algorithm"],"_links":{"self":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/853","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=853"}],"version-history":[{"count":1,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/853\/revisions"}],"predecessor-version":[{"id":3460,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/853\/revisions\/3460"}],"wp:attachment":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=853"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}