{"id":55,"date":"2005-05-13T07:13:00","date_gmt":"2005-05-13T07:13:00","guid":{"rendered":"http:\/\/www.gisdeveloper.co.kr\/?p=55"},"modified":"2017-01-29T20:13:57","modified_gmt":"2017-01-29T11:13:57","slug":"opengl-tutorial-tessellation","status":"publish","type":"post","link":"http:\/\/www.gisdeveloper.co.kr\/?p=55","title":{"rendered":"[OpenGL Tutorial] TESSELLATION"},"content":{"rendered":"<p><P>OpenGL\uc5d0\uc11c \ud3f4\ub9ac\uace4\uc758 \uc81c\uc57d \uc911\uc5d0 \ud3f4\ub9ac\uace4\uc740 \uc624\ubaa9\ud55c \ubd80\ubd84\uc774 \uc788\uc5b4\uc11c\ub294 \uc54a\ub41c\ub2e4\ub294 \uac83\uc774\ub2e4. \uc989 \uc544\ub798\uc640 \uac19\uc740 \ubcc4 \ubaa8\uc591\uc758 \ud3f4\ub9ac\uace4\uc740 \uaddc\uce59\uc744 \uc704\ubc18\ud55c \ud3f4\ub9ac\uace4\uc774 \ub418\uaca0\ub2e4.<\/P><br \/>\n<P><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1015725429.gif\" class=\"aligncenter\" width=\"216\" height=\"220\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" \/><BR>\uc704\uc758 \ud3f4\ub9ac\uace4\uc740 \ucd1d 8\uac1c\uc758 \uc810\uc73c\ub85c \uc774\ub8e8\uc5b4\uc9c4 \ud3f4\ub9ac\uace4\uc774\ub2e4. \ud280\uc5b4\ub098\uc628 \ubd80\ubd84(\ubcfc\ub85d\ud55c \ubd80\ubd84)\uc774 \ucd1d 4\uac1c\uc778\ub370 \ud3f4\ub9ac\uace4\uc5d0\uc11c \ubcfc\ub85d\ud55c \ubd80\ubd84\uc740 \uc0c1\uad00\uc5c6\uc9c0\ub9cc \ub4e4\uc5b4\uac04 \ubd80\ubd84(\uc624\ubaa9\ud55c \ubd80\ubd84) \uc5ed\uc2dc 4\uac1c\ub85c\uc368 \uc774\uac83\uc740 OpenGL\uc5d0\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ubaa8\uc2b5\uc73c\ub85c \uc5f0\ucd9c\ub418\uace0\ub9cc\ub2e4.<\/P><br \/>\n<P><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1095308107.gif\" class=\"aligncenter\" width=\"213\" height=\"212\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" \/><\/P><br \/>\n<P>\uc624\ubaa9\ud55c \ubd80\ubd84\uc911\uc5d0 \ub450\uac1c\uc758 \ubd80\ubd84\uc774 \ubb34\uc2dc\ub418\uc5b4\uc838 \ubc84\ub9b0 \uc0c1\ud0dc\uc5d0\uc11c \uc5f0\ucd9c\ub418\uc5c8\ub2e4\ub294 \uac83\uc744 \uc54c\uc218\uc788\ub2e4. \uadf8\ub807\ub2e4\uba74 \uc774\ub7f0 \ud604\uc0c1\uc744 \uc5b4\ub5bb\uac8c \ub9c9\uc744\uc218\uc788\uaca0\ub294\uac00? \uadf8\uac83\uc740 \ud3f4\ub9ac\uace4\uc744 \uc624\ubaa9\ud55c \ubd80\ubd84\uc774 \uc5c6\ub3c4\ub85d \ucabc\uac1c\uc11c \ub098\ub204\uc5b4 \uc5f0\ucd9c\ud574\uc57c\ub9cc \ud55c\ub2e4. \uc5b4\ub5a0\ud55c \ud3f4\ub9ac\uace4\uc774\ub77c\ub3c4 \uc624\ubaa9\ud55c \ubd80\ubd84\uc774 \uc5c6\uc774 \ub098\ub20c \uc218\ub294 \uc788\uc9c0\ub9cc \ucabc\uac1c\uae30\uac00 \uc5b4\ub824\uc6b4 \uacbd\uc6b0\uac00 \ub9ce\ub2e4. \uadf8\ub807\ub2e4\uba74 \uc880\ub354 \uc27d\uac8c \uc704\uc758 \uc624\ub3d9\uc791 \uc544\ub2cc \uc624\ub3d9\uc791\uc744 \ubc29\uc9c0\ud558\ub294 \ubc29\ubc95\uc740 \uc5c6\ub294\uac00? \ub2e4\ud589\uc774\ub3c4 TESSELLATION\uc774\ub77c\ub294 \uae30\ub2a5\uc774 \uc788\ub2e4. \uc774\uac83\uc740 \ud3f4\ub9ac\uace4\uc758 \uac01 \uaf2d\uc9c0\uc810\ub9cc\uc744 \uba85\uc2dc\ud574 \uc8fc\uba74 \uc790\ub3d9\uc73c\ub85c \ud3f4\ub9ac\uace4\uc744 \uc624\ubaa9\ud55c \ubd80\ubd84\uc774 \uc5c6\ub3c4\ub85d \ucabc\uac1c\uc11c \uc5f0\ucd9c\ud574 \uc8fc\ub294 \uc544\uc8fc \uac15\ub825\ud55c \uae30\ub2a5\uc774\ub2e4. \ubc14\ub85c \uc774\uc7a5\uc774 \uc774 TESSELLATION \uae30\ub2a5\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf4\ub294 \uc7a5\uc774\ub2e4.<\/P><P>(\uc65c OpenGL\uc740 \uc624\ubaa9\ud55c \ubd80\ubd84\uc744 \uac00\uc9c4 \ud3f4\ub9ac\uace4\uc744 \uc5f0\ucd9c\ud558\uc9c0 \ubabb\ud558\ub294\uac00? \uadf8\uac83\uc740 \ud3f4\ub9ac\uace4\uc744 \uc544\uc8fc \ube60\ub974\uac8c \uc5f0\ucd9c\ud558\uae30 \uc704\ud574\uc11c\uc774\ub2e4)<\/P><P>\uc790, \uc774\uc81c TESSELLATION\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf4\ub3c4\ub85d \ud558\uc790. \uc18c\uc2a4 \ucf54\ub4dc\ub294 1\uc7a5\uc758 \ucf54\ub4dc\uc5d0\uc11c \uc2dc\uc791\ud55c\ub2e4.<\/P><P>\uba3c\uc800 TESSELLATION(\uc55e\uc73c\ub85c Tess\ub77c \ubd80\ub974\uaca0\ub2e4) \uae30\ub2a5\uc744 \uc0ac\uc6a9\ud558\uae30 \uc704\ud55c \uac1d\uccb4\ub97c \ud558\ub098 \uc0dd\uc131\ud574\uc57c \uaca0\ub2e4. \uc774\ub97c \uc704\ud574\uc11c \uba3c\uc800 Tess \uac1d\uccb4\ub97c \uc704\ud55c \ud3ec\uc778\ud130 \ubcc0\uc218\ub97c \uc804\uc5ed \ubcc0\uc218 \uc120\uc5b8 \uc9c0\uc5ed\uc5d0 \ud558\ub098 \uc815\uc758\ud558\uc790. Tess\ub294 \uc5ec\ub7ec\uac00\uc9c0 \uc18d\uc131\uc744 \uac00\uc9c0\uace0 \uc788\uc73c\ubbc0\ub85c \uc774\ub7f0 \uc808\ucc28\uac00 \ud544\uc694\ud558\ub2e4.<\/P><\/p>\n<pre>GLUtriangulatorObj *tess;<\/pre>\n<p>\uc774\uc81c tess\ub77c\ub294 Tess\ub97c \uc704\ud55c \ud3ec\uc778\ud130 \ubcc0\uc218\uac00 \ub9cc\ub4e4\uc5b4\uc84c\ub2e4. \ud3ec\uc778\ud130 \ubcc0\uc218\uc774\ubbc0\ub85c \uc774\uc81c \uc2e4\uc81c \uc778\uc2a4\ud134\uc2a4\ub97c \uc0dd\uc131\ud574\uc57c \ud55c\ub2e4.<\/p>\n<pre>int initGL(GLvoid)\r\n{\r\n    glShadeModel(GL_SMOOTH); \/\/ Enable Smooth Shading\r\n    glClearColor(0.0f, 0.0f, 0.0f, 0.5f); \/\/ Black Background\r\n    glClearDepth(1.0f); \/\/ Depth Buffer Setup\r\n   \r\n    glEnable(GL_DEPTH_TEST); \/\/ Enables Depth Testing\r\n    glDepthFunc(GL_LEQUAL); \/\/ The Type Of Depth Testing To Do\r\n    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); \r\n    \/\/ Really Nice Perspective Calculations\r\n   \r\n    \/\/ New Adding\r\n    tess=gluNewTess(); \/\/<*>\r\n    gluTessCallback(tess, GLU_TESS_BEGIN, \r\n        (void (__stdcall *)(void))CustomTessBegin); \/\/<1>\r\n    gluTessCallback(tess, GLU_TESS_VERTEX, \r\n        (void (__stdcall *)(void))CustomTessVertex); \/\/<2>\r\n    gluTessCallback(tess, GLU_TESS_END, \r\n        (void (__stdcall *)(void))CustomTessEnd); \/\/<3>\r\n    gluTessCallback(tess, GLU_TESS_ERROR, \r\n        (void (__stdcall *)(void))CustomTessError); \/\/<4>\r\n   \r\n    return TRUE; \/\/ Initialization Went OK\r\n}<\/pre>\n<p>\uc704\uc758 \ucf54\ub4dc\ub294 \uc6b0\ub9ac\uc5d0\uac8c \uc775\uc219\ud55c \ucd08\uae30\ud654 \ucf54\ub4dc\uac00 \uc624\ub294 \ud568\uc218\uc774\ub2e4. \ubc14\ub85c <*>\ubc88\uc758 \ucf54\ub4dc\uac00 Tess\uac1d\uccb4\uc758 \uc778\uc2a4\ud134\uc2a4\ub97c \uc0dd\uc131\ud558\uc5ec \uc804\uc5ed\ubcc0\uc218\uc5d0\uc11c \uc815\uc758\ud55c tess \ud3ec\uc778\ud130 \ubcc0\uc218\uc5d0\uac8c \ub118\uaca8\uc8fc\ub294 \uae30\ub2a5\uc744 \ud55c\ub2e4. (\uc8fc\uc758: Tess\ub294 TESSELLATION\uc744 \uc758\ubbf8\ud558\uace0 tess\ub294 \uc55e\uc11c \uc815\uc758\ud55c \ud3ec\uc778\ud130 \ubcc0\uc218\uba85) Tess \uc778\uc2a4\ud134\uc2a4\ub97c \uc0dd\uc131\ud588\uc73c\ubbc0\ub85c \uc6b0\ub9ac\uac00 \ud504\ub85c\uadf8\ub7a8\uc744 \uc885\ub8cc\ud560\ub54c \ud574\uc81c\ud574 \uc8fc\ub294 \ucf54\ub4dc\uac00 \uc788\uc5b4\uc57c \ud55c\ub2e4\ub294 \uac83\uc740 \uc790\uba85\ud55c \uc0ac\uc2e4\uc774\ub2e4. glKillWindow \ud568\uc218\uc758 \ub9e8 \uc544\ub798 \ubd80\ubd84\uc5d0 \ub2e4\uc74c \ucf54\ub4dc\ub97c \ucd94\uac00\ud558\uc790.<\/p>\n<pre>gluDeleteTess(tess);<\/pre>\n<p>\uc774\uc81c \uc2e4\ud3b4\ubcf4\uc544\uc57c \ud560\uac83\uc740 <1>~<4>\ubc88 \ucf54\ub4dc\ub4e4\uc778\ub370 \uc774\uac83\ub4e4\uc740 \ubb34\uc5c7\uc778\uac00? Tess\ub294 Core(\ud575\uc2ec) OpenGL API\uad70\uc774 \uc544\ub2cc GLU\ub77c\ub294 \uc720\ud2f8\ub9ac\ud2f0 API\uad70\uc774\ub2e4. \ub530\ub77c\uc11c \ucf54\uc5b4 OpenGL API\uac00 \uc544\ub2cc Tess\uac00 \ud3f4\ub9ac\uace4\uc744 \uadf8\ub9ac\uae30 \uc704\ud574\uc11c\ub294 \ucf54\uc5b4 OpenGL API\uc758 \ub3c4\uc6c0\uc744 \ubc1b\uc544\uc57c \ud558\ub294\ub370 \ubc14\ub85c \uc774 \ub3c4\uc6c0\uc744 \ubc1b\uae30 \uc704\ud55c \ucf54\uc5b4 OpenGL API \ud568\uc218\ub4e4\uc744 \ucf5c\ubc31\ud558\uae30 \uc704\ud55c \ucf54\ub4dc\ub4e4\uc774\ub2e4.<\/P><P>gluTessCallback\ud568\uc218\ub294 \uc138\uac1c\uc758 \uc778\uc790\ub97c \ucde8\ud558\ub294\ub370 \uccab\ubc88\uc9f8\ub294 Tess \uac1d\uccb4\uc758 \ud3ec\uc778\ud130 \ubcc0\uc218\uc774\uace0 \ub458\uc9f8\ub294 \uc5b4\ub5a4 \uae30\ub2a5\uc5d0 \ub300\ud55c \ucf5c\ubc31\ud568\uc218\ub97c \uc9c0\uc815\ud560 \uac83\uc778\uc9c0\uc5d0 \ub300\ud55c \uc2dd\ubcc4\uc790\uc774\uace0 \uc138\ubc88\uc9f8 \uc778\uc790\ub294 \uc2e4\uc81c \ucf5c\ubc31\ub420 \ud568\uc218\uc774\ub2e4. \uc774\uc81c \ud558\ub098 \ud558\ub098 \uc0b4\ud3b4\ubcf4\uc790.<\/P><P><1>\ubc88\uc740 Tess\uac00 \ud3f4\ub9ac\uace4\uc744 \uadf8\ub9ac\uae30 \uc2dc\uc791\ud560\ub54c \ud638\ucd9c\ub420 \ucf5c\ubc31\ud568\uc218\ub97c \uc9c0\uc815\ud558\ub294 \uac83\uc774\ub2e4.<\/P><P><2>\ubc88\uc740 Tess\uac00 \ud3f4\ub9ac\uace4\uc744 \uadf8\ub9ac\uae30 \uc704\ud574\uc11c \uac01 \uaf2d\uc9c0\uc810\uc744 \uc9c0\uc815\ud560\ub54c \ud638\ucd9c\ud560 \ucf5c\ubc31\uc218\ub97c \uc9c0\uc815\ud558\ub294 \uac83\uc774\ub2e4.<\/P><P><3>\ubc88\uc740 Tess\uac00 \ud3f4\ub9ac\uace4\uc744 \ub2e4 \uadf8\ub838\ub2e4\uace0 \ud310\ub2e8\ud560\ub54c \ud638\ucd9c\ud560 \ucf5c\ubc31\ud568\uc218\ub97c \uc9c0\uc815\ud558\ub294 \uac83\uc774\ub2e4.<\/P><P><4>\ubc88\uc740 Tess\uac00 \ud3f4\ub9ac\uace4\uc744 \uadf8\ub9ac\ub294 \ub3c4\uc911\uc5d0 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud560\ub54c \ud638\ucd9c\ud560 \ucf5c\ubc31\ud568\uc218\ub97c \uc9c0\uc815\ud558\ub294 \uac83\uc774\ub2e4.<\/P><P>\uadf8\ub807\ub2e4\uba74 \uac01 \ucf5c\ubc31 \ud568\uc218\ub294 \uc5b4\ub5a4 \ub0b4\uc6a9\uc744 \ub2f4\uace0 \uc788\ub294\uac00. \uc704\uc5d0 \uc81c\uc2dc\ub41c 4\uac1c\uc758 \ucf5c\ubc31\ud568\uc218\uc758 \ubaa8\uc2b5\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/P><\/p>\n<pre>void __stdcall CustomTessBegin(GLenum prim)\r\n{\r\n    glBegin(prim);\r\n}\r\n\r\nvoid __stdcall CustomTessVertex(void *data)\r\n{\r\n    glVertex3dv((GLdouble *)data);\r\n}\r\n\r\nvoid __stdcall CustomTessEnd()\r\n{\r\n    glEnd();\r\n}\r\n\r\nvoid __stdcall CustomTessError(GLenum errorCode)\r\n{\r\n    char err[256];\r\n   \r\n    sprintf(err, \"Tessellation Error: %s\\n\", gluErrorString(errorCode));\r\n    if(errorCode!=GL_NO_ERROR) \r\n        MessageBox(hWnd, err, \"TESSELLATION Error\", MB_OK);\r\n}<\/pre>\n<p>CustomTessBegin\uc740 glBegin\uc774\ub77c\ub294 \ucf54\uc5b4 OpenGL API\ub97c \ud638\ucd9c\ud558\uace0 \uc788\uace0 CustomTessVertex\ub294 glVertex3dv\ub77c\ub294 \ucf54\uc5b4 OpenGL API\ub97c \ud638\ucd9c\ud558\uace0 \uc788\ub2e4. CustomTessEnd\ub294 glEnd\ub77c\ub294 \ucf54\uc5b4 OpenGL API\ub97c \ud638\ucd9c\ud558\uace0 \uc788\uace0 CustomTessError\ub294 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud560\uc744\ub54c \ucc98\ub9ac\ud560 \ucf54\ub4dc\ub4e4\uc774 \ub2f4\uaca8\uc788\ub294\ub370 \uc5ec\uae30\uc11c\ub294 \uadf8 \uc5d0\ub7ec\uac00 \ubb34\uc5c7\uc778\uc9c0\ub97c \ud45c\ud604\ud574\uc8fc\uae30\ub9cc \ud55c\ub2e4. \uc2e4\uc81c\ub85c \uc704\uc758 \ucf54\ub4dc\ub4e4\uc740 \uc5ec\ub7ec\ubd84\uc774 \uc9c1\uc811 \ud0c0\uc774\ud551\ud574\uc57c \ud55c\ub2e4. \uc989, \uc815\ub9ac\ud558\uc790\uba74 Tess\ub294 \ud3f4\ub9ac\uace4\uc744 \uadf8\ub9ac\uae30 \uc704\ud574\uc11c \ucf54\uc5b4 OpenGL API\uc758 \uc9c1\uc811\uc801\uc778 \ub3c4\uc6c0\uc744 \ubc1b\uc544 \uc0dd\uc131\ud55c\ub2e4\ub294 \uac83\uc774\ub2e4.<br \/>\n<P>\uc790, \uc774\uc81c Tess\ub97c \uc774\uc6a9\ud574\uc11c \ubb3c\uccb4\ub97c \uadf8\ub824\ubcf4\ub294 \ucf54\ub4dc\ub97c \uc791\uc131\ud558\ub294 \uac83\ub9cc\uc774 \ub0a8\uc558\ub2e4. \uc5b4\ub5a4 \ud3f4\ub9ac\uace4\uc744 \uadf8\ub9b4\uae4c? \uc6b0\ub9ac\uac00 \uc774 \uc7a5\uc758 \ub9e8 \uccab\ubd80\ubd84\uc5d0\uc11c \uc18c\uac1c\ud588\ub358 \ubcc4\ub85c \ud558\uc790. \uba3c\uc800 \uadf8 \ubcc4\uc744 \uadf8\ub9ac\uae30 \uc704\ud574 \uadf8 \ubcc4 \ubaa8\uc591\uc758 \ud3f4\ub9ac\uace4\uc758 \uaf2d\uc9c0\uc810\uc758 \ub370\uc774\ud0c0\ub97c \uc815\uc758\ud574\uc57c\ud55c\ub2e4. \uc804\uc5ed \ubcc0\uc218\uc5d0\uc11c \ub2e4\uc74c\uacfc \uac19\uc740 \ubc30\uc5f4\uc744 \uc815\uc758\ud558\uc790.<\/P><\/p>\n<pre>GLdouble ov[8][3] = {{0.0f, 1.0f, 0.0f},\r\n  {0.4f, 0.4f, 0.0f},\r\n  {1.0f, 0.0f, 0.0f},\r\n  {0.4f, -0.4f, 0.0f},\r\n  {0.0f, -1.0f, 0.0f},\r\n  {-0.4f, -0.4f, 0.0f},\r\n  {-1.0f, 0.0f, 0.0f},\r\n  {-0.4f, 0.4f, 0.0f} };<\/pre>\n<p>\uc774\ubbf8 \uc9d0\uc791\ud558\uace0 \uc788\ub358\ub300\ub85c \uac01\uac01\uc758 8\uac1c\uc758 \uaf2d\uc9c0\uc810\uc744 \uc815\uc758\ud558\uace0 \uc788\ub2e4. \uc774 \ubc30\uc5f4\uc744 \ud1a0\ub300\ub85c \ud574\uc11c \ubcc4 \ubaa8\uc591\uc758 \ud3f4\ub9ac\uace4\uc744 \uadf8\ub9ac\ub824\uace0 \ud558\ub294 \uac83\uc774\ub2e4. \uc774\uc81c \uc2e4\uc81c\ub85c \uadf8\ub824\uc8fc\ub294 \ucf54\ub4dc\ub97c \uc0b4\ud3b4 \ubcf4\ub3c4\ub85d\ud558\uc790. DrawGLScene \ud568\uc218\ub97c \uc0b4\ud3b4\ubcf4\uc790.<\/p>\n<pre>int DrawGLScene(GLvoid) \/\/ Here's Where We Do All The Drawing\r\n{\r\n    \/\/ Clear Screen And Depth Buffer\r\n    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); \r\n    glLoadIdentity(); \/\/ Reset The Current Modelview Matrix\r\n    glTranslatef(0.0f, 0.0f, -3.0f);\r\n   \r\n    gluTessBeginPolygon(tess, NULL);    \/\/ <1>\r\n    gluTessBeginContour(tess);          \/\/ <2>\r\n    gluNextContour(tess, GLU_EXTERIOR); \/\/ <3>\r\n    gluTessVertex(tess, ov[0], ov[0]);  \/\/ <4>\r\n    gluTessVertex(tess, ov[1], ov[1]);  \/\/ <5>\r\n    gluTessVertex(tess, ov[2], ov[2]);  \/\/ <6>\r\n    gluTessVertex(tess, ov[3], ov[3]);  \/\/ <7>\r\n    gluTessVertex(tess, ov[4], ov[4]);  \/\/ <8>\r\n    gluTessVertex(tess, ov[5], ov[5]);  \/\/ <9>\r\n    gluTessVertex(tess, ov[6], ov[6]);  \/\/ <10>\r\n    gluTessVertex(tess, ov[7], ov[7]);  \/\/ <11>\r\n    gluTessVertex(tess, ov[0], ov[0]);  \/\/ <12>\r\n    gluTessEndContour(tess);            \/\/ <13>\r\n    gluTessEndPolygon(tess);            \/\/ <14>\r\n   \r\n    return TRUE; \/\/ Everything Went OK\r\n}<\/pre>\n<p>\uc790, \ub178\ub780\uc0c9\uc758 \ucf54\ub4dc\uac00 \uc0c8\ub86d\uac8c \ucd94\uac00\ub41c \ucf54\ub4dc\uc774\ub2e4. \uc0c8\ub86d\uac8c \ub4f1\uc7a5\ud55c \ub140\uc11d\ub4e4\uc5d0 \ub300\ud574\uc11c \uc0b4\ud3b4\ubcf4\ub3c4\ub85d \ud558\uc790.<P><1>\ubc88 \ucf54\ub4dc\ub294 \uc6b0\ub9ac\uac00 \uc0dd\uc131\ud55c Tess\uac1d\uccb4\uc758 \uc778\uc2a4\ud134\uc2a4 \ud3ec\uc778\ud130 \ubcc0\uc218\ub97c \uc774\uc6a9\ud574\uc11c \ud3f4\ub9ac\uace4\uc744 \uadf8\ub9b0\ub2e4\ub294 \uc2dc\uc791\uc744 \uc54c\ub9ac\ub294 \uac83\uc774\ub2e4.<\/P><P><2>\ubc88 \ucf54\ub4dc\ub294 \ud3f4\ub9ac\uace4\uc758 \uc724\uacfd\uc758 \ud55c\uacc4\ub97c \uc9c0\uc815\ud55c\ub2e4\ub294 \uc758\ubbf8\uc774\uace0 <13>\ucf54\ub4dc\uc640 \uc30d\uc73c\ub85c \uc0ac\uc6a9\ub41c\ub2e4.<\/P><P><3>\ubc88 \ucf54\ub4dc\ub294 \uc55e\uc73c\ub85c \uc9c0\uc815\ub420 \ud3f4\ub9ac\uace4\uc758 \uc810\ub4e4\uc740 \ud3f4\ub9ac\uace4\uc758 \uac00\uc7a5\uc790\ub9ac\uc758 \uc810\ub4e4\uc784\uc744 \uc54c\ub9ac\ub294 \uac83\uc774\ub2e4.<\/P><P><4>~<12>\ubc88 \ucf54\ub4dc\ub294 \ud3f4\ub9ac\uace4\uc758 \uc810\ub4e4\uc744 \uc9c0\uc815\ud558\ub294 \ucf54\ub4dc\uc778\ub370 \uc774\uc0c1\ud558\uac8c\ub3c4 2\uac1c\uc758 \uc810\uc88c\ud45c\uac12\uc744 \ub611 \uac19\uc774 \uc8fc\uc5c8\ub294\ub370 \uccab\ubc88\uc9f8 \uc88c\ud45c\uac12\uc740 Tess\uac00 \uc0ac\uc6a9\ud558\ub294 \uac83\uc774\uace0 \uc138\ubc88\uc7ac \uc88c\ud45c\ub294 \uc6b0\ub9ac\uac00 \uc55e\uc11c \uc9c0\uc815\ud55c CustomTessVertex \ucf5c\ubc31 \ud568\uc218\uc5d0 \uc804\ub2ec\ub418\ub294 \uc88c\ud45c\uac12\uc774\ub2e4.<\/P><P><13>\ubc88\uc740 <2>\ubc88\uacfc \uc30d\uc744 \uc774\ub8e8\ub294 \uac83\uc73c\ub85c\uc368 \uc724\uacfd\uc758 \ud55c\uacc4 \uc9c0\uc815\uc744 \ub05d\ub9c8\uce5c\ub2e4\ub294 \uac83\uc774\ub2e4.<\/P><P><14>\ubc88\uc740 Tess\uc758 \ud3f4\ub9ac\uace4 \uc0dd\uc131\uc744 \ub05d\ub9c8\uce5c\ub2e4\ub294 \uc758\ubbf8\uc774\ub2e4.<\/P><P>\uc774\uc81c \uc2e4\ud589\uc744 \ud574\ubcf4\uc790. \uc544\ub798\ub294 \uadf8 \uc2e4\ud589 \uacb0\uacfc\uc774\ub2e4.<\/P><P><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1142352140.gif\" class=\"aligncenter\" width=\"470\" height=\"383\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" \/><BR>\uc5b4\ub5a4\uac00? \ub3c5\uc790\uac00 \uc0dd\uac01\ud588\ub358 \ub300\ub85c \uc2e4\ud589\uc774 \ub418\uc5c8\ub294\uac00? \uc774\uc81c \uc5ec\uae30\uc11c \uc6b0\ub9ac\ub294 \uc774 \ud3f4\ub9ac\uace4\uc758 \uac00\uc6b4\ub370\uc5d0 \uad6c\uba4d\uc744 \ub6a4\uc5b4\ubcf4\uc790. \uc989 \ub2e4\uc74c\uacfc \uac19\uc740 \ubaa8\uc2b5\uc744 \uc5bb\uae30 \uc704\ud574\uc11c \ub9d0\uc774\ub2e4.<\/P><P><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1144025156.gif\" class=\"aligncenter\" width=\"228\" height=\"228\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" \/><\/P><P>\uc77c\ub2e8 \uac00\uc6b4\ub370 \uad6c\uba4d\uc744 \ub6ab\uae30 \uc704\ud574\uc11c \uc0ac\uc6a9\ud560 \uc810\ub4e4\uc758 \uc88c\ud45c\uac00 \ud544\uc694\ud558\ub2e4. \uad6c\uba4d\uc774 \uc0ac\uac01\ud615\uc774\ubbc0\ub85c 4\uac1c\uc758 \uc88c\ud45c\uac12\ub9cc \uc788\uc73c\uba74 \ucda9\ubd84\ud558\ub2e4. \uadf8 \uc88c\ud45c\uac12\ub4e4\uc744 \uc815\uc758\ud558\uae30 \uc704\ud574\uc11c \ub2e4\uc2dc \uc804\uc5ed\ubcc0\uc218 \uc120\uc5b8\ubd80\uc5d0 \ub2e4\uc74c\uacfc \uac19\uc740 \ubc30\uc5f4\uc744 \uc815\uc758\ud55c\ub2e4.<\/P><\/p>\n<pre>GLdouble iv[4][3] = {{0.0f, 0.2f, 0.0f},\r\n   {0.2f, 0.0f, 0.0f},\r\n   {0.0f, -0.2f, 0.0f},\r\n   {-0.2f, 0.0f, 0.0f} };<\/pre>\n<p>\uc774\uc81c DrawGLScene\uc5d0 \uc5b4\ub5a4 \ucf54\ub4dc\uac00 \ub610 \uc0c8\ub86d\uac8c \ucd94\uac00\ub418\uc5c8\ub294\uc9c0\ub97c \uc0b4\ud3b4\ubcf4\uc790.<\/p>\n<pre>int DrawGLScene(GLvoid) \/\/ Here's Where We Do All The Drawing\r\n{\r\n    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); \/\/ Clear Screen And Depth Buffer\r\n    glLoadIdentity(); \/\/ Reset The Current ModelviewMatrix\r\n    glTranslatef(0.0f, 0.0f, -3.0f);\r\n   \r\n    gluTessBeginPolygon(tess, NULL);\r\n    gluTessBeginContour(tess);\r\n    gluNextContour(tess, GLU_EXTERIOR);\r\n    gluTessVertex(tess, ov[0], ov[0]);\r\n    gluTessVertex(tess, ov[1], ov[1]);\r\n    gluTessVertex(tess, ov[2], ov[2]);\r\n    gluTessVertex(tess, ov[3], ov[3]);\r\n    gluTessVertex(tess, ov[4], ov[4]);\r\n    gluTessVertex(tess, ov[5], ov[5]);\r\n    gluTessVertex(tess, ov[6], ov[6]);\r\n    gluTessVertex(tess, ov[7], ov[7]);\r\n    gluTessVertex(tess, ov[0], ov[0]);\r\n   \r\n    gluNextContour(tess, GLU_INTERIOR); \/\/<1>\r\n    gluTessVertex(tess, iv[0], iv[0]); \/\/<2>\r\n    gluTessVertex(tess, iv[1], iv[1]); \/\/<3>\r\n    gluTessVertex(tess, iv[2], iv[2]); \/\/<4>\r\n    gluTessVertex(tess, iv[3], iv[3]); \/\/<5>\r\n    gluTessVertex(tess, iv[0], iv[0]); \/\/<6>\r\n    gluTessEndContour(tess);\r\n    gluTessEndPolygon(tess);\r\n   \r\n    return TRUE; \/\/ Everything Went OK\r\n}<\/pre>\n<p><1>\ubc88\uc744 \uc8fc\uc758 \uae4a\uac8c \uc2e4\ud3b4\ubcf4\uc790. \ub450\ubc88\uc9f8 \uc778\uc790\ub85c GLU_INTERIOR\uc774\ub77c\uace0 \ub418\uc5b4\uc788\ub2e4. \ubc14\ub85c \uc774\uac83\uc774 \ud0a4\ud3ec\uc778\ud2b8\uc778\ub370 <1>\ubc88 \ucf54\ub4dc \uc774\ud6c4\ub85c \uc9c0\uc815\ub418\ub294 \uc810\ub4e4\uc758 \uc88c\ud45c\ub294 \ubaa8\ub450 \uad6c\uba4d\uc744 \ub6ab\uae30 \uc704\ud55c \ud3f4\ub9ac\uace4\uc758 \uc88c\ud45c\ub85c \uc778\uc2dd\ub418\ub294 \uac83\uc774\ub2e4.<br \/>\n<P><2>~<6>\uc740 \ubaa8\ub450 \uad6c\uba4d\uc744 \ub6ab\uae30 \uc704\ud55c \ud3f4\ub9ac\uace4\uc758 \uc88c\ud45c\ub97c \uc9c0\uc815\ud55c\ub2e4.<\/P><P>\uc774\uc81c \uc2e4\ud589\ud574 \ubcf4\ub77c. \uadf8\ub7ec\uba74 \uc6b0\ub9ac\uac00 \uc6d0\ud558\ub294 \uacb0\uacfc\ub97c \uc5bb\uc744\uc218\uc788\ub2e4.<\/P><P>\uc790, \uc774\uc81c \ub9c8\uc9c0\ub9c9\uc73c\ub85c \ud544\uc790\uac00 \uc18c\uac1c\ud560 \uac83\uc774 \ud558\ub098 \ub0a8\uc558\ub2e4. \ubc14\ub85c \uadf8\uac83\uc740 \uc9c0\uae08\uae4c\uc9c0\ub294 \ud3f4\ub9ac\uace4\uc744 \ub0b4\ubd80\uac00 \ucc44\uc6cc\uc9c4 \uac83\uc73c\ub85c \uadf8\ub824\uc654\ub294\ub370 \uc774\uc81c\ub294 \uadf8\uac83\uc774 \uc544\ub2cc \ub0b4\ubd80\uac00 \uce60\ud574\uc9c0\uc9c0 \uc54a\ub294, \uc989 \uac00\uc7a5\uc790\ub9ac \uc120\ub9cc\uc744 \uadf8\ub9ac\uace0\uc790 \ud558\ub294 \uac83\uc774\ub2e4. \uc544\ub9c8\ub3c4 \ub3c5\uc790\uc911\uc5d0\uc11c\ub294 \uadf8\uac70\uc57c \uc27d\uc9c0 \uc54a\uc740\uac00\ud560 \uc0ac\ub78c\ub3c4 \uc788\uc744 \uac83\uc774\ub2e4. \ubc14\ub85c glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)\ub85c \ud574\uc8fc\uba74 \ub418\uaca0\ub2e4 \ud560\uac83\uc774\ub2e4. \uadf8\ub807\ub2e4\uba74 \uc774 \ucf54\ub4dc\ub97c \uc9c0\uae08\uae4c\uc9c0 \uc6b0\ub9ac\uac00 \ub9cc\ub4e0(\uad6c\uba4d \ub6ab\ub9b0 \ud3f4\ub9ac\uace4) \ucf54\ub4dc\uc758 InitGL \ud568\uc218\uc5d0 \ucd94\uac00\ud574\uc11c \uc2e4\ud589\uc2dc\ucf1c \ubcf4\uc790. \uadf8 \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/P><br \/>\n<P><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1032331579.gif\" class=\"aligncenter\" width=\"444\" height=\"342\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" \/><\/P><br \/>\n<P>\uc5b4\ub5a4\uac00? \uc6b0\ub9ac\ub294 \uac00\uc7a5 \uc790\ub9ac\uc758 \uc120\ub9cc\uc744 \uc6d0\ud588\uc9c0\ub9cc \uadf8 \ub0b4\ubd80\uc758 \uc120\ub4e4\uae4c\uc9c0\ub3c4 \ubaa8\ub450 \uadf8\ub824\uc838 \ubc84\ub838\ub2e4. \uc774\uac83\uc740 \uc6b0\ub9ac\uac00 \uc6d0\ud558\ub294 \uacb0\uacfc\uac00 \uc544\ub2c8\ub2e4. \uadf8\ub807\ub2e4\uba74 \uc6b0\ub9ac\uac00 \uc6d0\ud558\ub294 \uacb0\uacfc\ub97c \uc5bb\uae30 \uc704\ud574\uc11c\ub294 \uc5b4\ub5bb\uac8c \ud574\uc57c \ud558\ub294\uac00? \ub2e4\ud589\uc774\ub3c4 Tess\ub294 \ud55c \ub2e8\uc904\uc758 \ucf54\ub4dc\ub85c \uc6b0\ub9ac\uc5d0\uac8c \uadf8 \uacb0\uacfc\ub97c \uc81c\uacf5\ud55c\ub2e4. gluTessProperty(tess, GLU_TESS_BOUNDARY_ONLY, true), \uc774 \ucf54\ub4dc\ub97c InitGL\ud568\uc218\uc758 \ub9e8 \uc544\ub798\ubd80\ubd84\uc5d0 \ucd94\uac00\ud55c\ud6c4 \uc2e4\ud589\ud574 \ubcf4\ub77c. \uadf8 \uacb0\uacfc\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4. (\uc774\uc81c \ub354 \uc774\uc0c1 glPolygonMode \ucf54\ub4dc\ub294 \ud544\uc694\uce58 \uc54a\ub2e4)<\/P><br \/>\n<P><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1230840112.gif\" class=\"aligncenter\" width=\"441\" height=\"340\" alt=\"\uc0ac\uc6a9\uc790 \uc0bd\uc785 \uc774\ubbf8\uc9c0\" \/><\/P><br \/>\n<P>\uc774\uc81c, \uc6b0\ub9ac\uac00 \uc6d0\ud558\ub294 \uacb0\uacfc\uac00 \uc5bb\uc5b4\uc84c\ub2e4. <\/P><P>\uc790 \uc774\ub85c\uc368 TESSELLATION\uc5d0 \ub300\ud55c \uac83\uc5d0 \ub300\ud574 \uc0b4\ud3b4\ubcf4\ub294 \uac83\uc744 \ub9c8\uce58\ub3c4\ub85d \ud558\uaca0\ub2e4.<\/p>\n<p style='text-align:center'><a href=\"http:\/\/www.gisdeveloper.co.kr\/wp-content\/uploads\/1\/1011506474.zip\"><img width='64' src='\/images\/download.svg' \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>OpenGL\uc5d0\uc11c \ud3f4\ub9ac\uace4\uc758 \uc81c\uc57d \uc911\uc5d0 \ud3f4\ub9ac\uace4\uc740 \uc624\ubaa9\ud55c \ubd80\ubd84\uc774 \uc788\uc5b4\uc11c\ub294 \uc54a\ub41c\ub2e4\ub294 \uac83\uc774\ub2e4. \uc989 \uc544\ub798\uc640 \uac19\uc740 \ubcc4 \ubaa8\uc591\uc758 \ud3f4\ub9ac\uace4\uc740 \uaddc\uce59\uc744 \uc704\ubc18\ud55c \ud3f4\ub9ac\uace4\uc774 \ub418\uaca0\ub2e4. \uc704\uc758 \ud3f4\ub9ac\uace4\uc740 \ucd1d 8\uac1c\uc758 \uc810\uc73c\ub85c \uc774\ub8e8\uc5b4\uc9c4 \ud3f4\ub9ac\uace4\uc774\ub2e4. \ud280\uc5b4\ub098\uc628 \ubd80\ubd84(\ubcfc\ub85d\ud55c \ubd80\ubd84)\uc774 \ucd1d 4\uac1c\uc778\ub370 \ud3f4\ub9ac\uace4\uc5d0\uc11c \ubcfc\ub85d\ud55c \ubd80\ubd84\uc740 \uc0c1\uad00\uc5c6\uc9c0\ub9cc \ub4e4\uc5b4\uac04 \ubd80\ubd84(\uc624\ubaa9\ud55c \ubd80\ubd84) \uc5ed\uc2dc 4\uac1c\ub85c\uc368 \uc774\uac83\uc740 OpenGL\uc5d0\uc11c\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \ubaa8\uc2b5\uc73c\ub85c \uc5f0\ucd9c\ub418\uace0\ub9cc\ub2e4. \uc624\ubaa9\ud55c \ubd80\ubd84\uc911\uc5d0 \ub450\uac1c\uc758 \ubd80\ubd84\uc774 \ubb34\uc2dc\ub418\uc5b4\uc838 \ubc84\ub9b0 \uc0c1\ud0dc\uc5d0\uc11c \uc5f0\ucd9c\ub418\uc5c8\ub2e4\ub294 &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/www.gisdeveloper.co.kr\/?p=55\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;[OpenGL Tutorial] TESSELLATION&#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":[4],"tags":[3],"class_list":["post-55","post","type-post","status-publish","format-standard","hentry","category-opengl","tag-opengl"],"_links":{"self":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/55","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=55"}],"version-history":[{"count":3,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/55\/revisions"}],"predecessor-version":[{"id":3820,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/55\/revisions\/3820"}],"wp:attachment":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=55"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=55"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=55"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}