{"id":53,"date":"2005-05-12T07:04:00","date_gmt":"2005-05-12T07:04:00","guid":{"rendered":"http:\/\/www.gisdeveloper.co.kr\/?p=53"},"modified":"2017-01-29T20:17:23","modified_gmt":"2017-01-29T11:17:23","slug":"opengl-tutorial-selection","status":"publish","type":"post","link":"http:\/\/www.gisdeveloper.co.kr\/?p=53","title":{"rendered":"[OpenGL Tutorial] Selection"},"content":{"rendered":"

\uc774 \uc7a5\uc5d0\uc11c\ub294 OpenGL\uc5d0\uc11c \uc6b0\ub9ac\uac00 \uc5b4\ub5a4 \ubb3c\uccb4\ub4e4\ub97c \ud654\uba74\uc0c1\uc5d0 \uadf8\ub838\uace0 \ud654\uba74\uc0c1\uc758 \ubb3c\uccb4\ub4e4\uc911\uc5d0 \ud558\ub098\uc758 \ubb3c\uccb4\ub97c \ub9c8\uc6b0\uc2a4\ub85c \ud074\ub9ad\ud588\uc744\ub54c \uc5b4\ub5a4 \ubb3c\uccb4\uac00 \ud074\ub9ad\ub418\uc5c8\ub294\uc9c0 \uc989, \uc5b4\ub5a4 \ubb3c\uccb4\uac00 \ud53d\ud0b9(Picking)\ub418\uc5c8\ub294\uc9c0\ub97c \uc544\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf8\ub2e4. <\/P>

OpenGL\uc5d0\uc11c \uc0ac\uc6a9\uc790\uc640\uc758 \ub300\ud654\ub97c \uc704\ud55c \uc544\uc8fc \uac15\ub825\ud55c \ubc29\ubc95\uc774\uace0 \uc190\uc26c\uc6b4 \ubc29\ubc95\uc774\ub2e4.<\/P>

\ud604\uc81c \ud544\uc790\ub294 \uc774 Selection \uae30\ubc95\uc5d0 \ub300\ud55c \ucda9\ubd84\ud55c \uc0ac\uc6a9\ubc95\ub9cc\uc744 \uc54c\uace0 \uc788\uc744\ubfd0\uc774\uba70 \uadf8 \ub0b4\ubd80\uc801\uc778 \uc6d0\ub9ac\uc5d0 \ub300\ud574\uc11c\ub294 \uc774\ud574\ud558\uc9c0 \ubabb\ud558\uace0 \uc788\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \uc6d0\ub9ac\uc5d0 \ub300\ud574 \uc124\uba85\uc740 \ud604\uc7ac\ub85c\uc368\ub294 \ud544\uc790\uc758 \ub2a5\ub825\ubc16\uc774\uba70 \ub098\uc911\uc5d0 \ub2a5\ub825\uc774 \ub2fa\ub294\ub370\ub85c \uc774 \uc7a5\uc758 \ub0b4\uc6a9\uc744 \ubcf4\uc644\ud574 \ub098\uac08 \uac83\uc774\ub2e4.<\/P>

\ubc14\ub85c \uc18c\uc2a4 \ucf54\ub4dc\ub85c \ub4e4\uc5b4\uac00 \ubcf4\uc790. \uc774 \uc7a5\uc740 1\uc7a5\uc5d0\uc11c \uc5bb\uc740 \uc18c\uc2a4 \ucf54\ub4dc\uc5d0\uc11c \uc2dc\uc791\ud55c\ub2e4.<\/P>

\uba3c\uc800 \ud654\uba74\uc0c1\uc5d0 \ubb34\uc5c7\uc744 \uadf8\ub9b4\uac83\uc778\uc9c0 \uc0dd\uac01\ud574\ubcf4\uc790. \ub2e4\uc74c\uc758 \ud654\uba74\uc774 \uc6b0\ub9ac\uac00 \uadf8\ub9b4 \ucd5c\uc885\uc801\uc778 \ubaa8\uc591\uc0c8\uc774\ub2e4.<\/P>\"\uc0ac\uc6a9\uc790
\n

\uc704\uc758 \uadf8\ub9bc\uc744 \ud544\uc790\uc640 \uac19\uc774 \uc0b4\ud3b4\ubcf4\uc790. \ud654\uba74\uc0c1\uc5d0\ub294 \ub178\ub780\uc0c9, \ud30c\ub791\uc0c9, \uc2dc\uc580\uc0c9, \ucd08\ub85d\uc0c9\uc758 \uc194\ub9ac\ub4dc \uad6c\uac00 \uc788\uc73c\uba70 \uadf8 \uc911\uc559\uc5d0 \ube68\uac04\uc0c9 \uc640\uc774\uc5b4 \uad6c\uac00 \uc788\ub2e4. \uadf8\ub9ac\uace0 \uac01\uac01\uc758 \uad6c\ub4e4\uc744 \ubcf4\uae30 \uc88b\uac8c \uc5f0\uacb0\ud574 \ub193\uc740 \uac83\ucc98\ub7fc \ubc1d\uc740 \ud30c\ub780\uc0c9\uc758 \uc120\ub4e4\uc744 \uadf8\ub824\ub193\uc558\ub2e4. \uc5ec\uae30\uc11c \uc6b0\ub9ac\ub294 \ub9c8\uc6b0\uc2a4\ub85c \uac01\uac01\uc758 \ub2e4\uc12f\uac1c\uc758 \uad6c\uc640 \uad6c\ub4e4\uc744 \uc5f0\uacb0\ud574 \ub193\uc740\ub4ef\ud55c \uc120\uc5d0 \ub300\ud574\uc11c \ud074\ub9ad\ud560 \uacbd\uc6b0 \ubb34\uc5c7\uc774 \ud074\ub9ad\ub418\uc5c8\ub294\uc9c0\ub97c \uc54c\ub824\uc8fc\ub3c4\ub85d \ud55c\ub2e4. \uc608\ub97c \ub4e4\uc5b4\uc11c \ub9c8\uc6b0\uc2a4\ub85c \ucd08\ub85d\uc0c9 \uad6c\ub97c \ud074\ub9ad\ud558\uba74 \ud654\uba74\uc0c1\uc5d0 “Green Solid Sphere”\ub77c\ub294 \uba54\uc138\uc9c0\uac00 \ub098\uc624\ub3c4\ub85d \ud558\uace0 \uac01\uac01\uc758 \uad6c\ub4e4\uc744 \uc5f0\uacb0\ud574 \ub193\uc740 \uc120\ub4e4\uc744 \ud074\ub9ad\ud558\uba74 \ub2e8\uc21c\ud558\uac8c “Line”\uc774\ub77c\ub294 \uba54\uc138\uc9c0\ub97c \ucd9c\ub825\ud574 \ubcf4\ub294 \uac83\uc774\ub2e4. \uc774 \ubaa8\ub4e0 \uac83\uc744 \uc704\ud55c \uac83\uc740 OpenGL \ub0b4\ubd80\uc5d0\uc11c \ucc98\ub9ac\ub418\ubbc0\ub85c \ubcc4\ub2e4\ub978 \ubcf5\uc7a1\ud55c \uc5f0\uad6c\uac00 \ud544\uc694\uce58 \uc54a\uc544 \ub2e4\ud589\uc774\ub2e4. \ucd5c\uadfc\uc5d0 \ud544\uc790\ub294 \uc774 \ud648\ud398\uc774\uc9c0\uc758 \ubc29\ubb38\uc790\ub85c\ubd80\ud130 \uc774 \ubc29\ubc95\uc73c\ub85c \uc120\ud0dd\ub418\uc9c0 \uc54a\ub294 \ubb3c\uccb4\uac00 \uc788\ub2e4\ub294 \uae00\uc744 \uc77d\uc5c8\ub2e4. \ud544\uc790\uac00 \uc2dc\ud5d8\ud574 \ubcf8 \ubc14\ub85c\ub294 OpenGL\uc5d0\uc11c \uc81c\uacf5\ub418\ub294 \ubaa8\ub4e0 \ubb3c\uccb4\uc5d0 \ub300\ud574\uc11c \uc120\ud0dd\ub428\uc744 \ud655\uc778\ud588\ub2e4. \ub2e8 \uc8fc\uc758\ud574\uc57c\ud560 \uac83\uc740 Nurb\uc778\ub370 Selection\uc744 \uc704\ud574 Nurbs\uc758 GLU_AUTO_LOAD_MATRIX\ub97c \uaebc\uc57c\ub9cc \ud55c\ub2e4\ub294 \uc810\uc774\ub2e4.<\/P>

\uc790, \uc774\uc81c \uc6b0\ub9ac\uac00 \uadf8\ub9b4 \uac83\ub4e4\uacfc \uc120\ud0dd\ud560 \uac83\ub4e4\uc5d0 \ub300\ud55c \uacb0\uc815\uc774 \ub05d\ub0ac\uc73c\ubbc0\ub85c \uc774\uc81c \uc704\uc758 \ubaa8\uc591\uc0c8\ub85c \uadf8\ub824\uc838\uc8fc\ub294 \ucf54\ub4dc\ub97c \uc791\uc131\ud574\ubcf4\uc790. \ub2e4\uc74c\uc740 \uc6b0\ub9ac\uc5d0\uac8c \uc544\uc8fc \uc775\uc219\ud55c DrawGLScean \ud568\uc218\uc758 \uad6c\ud604\ubd80\uc774\ub2e4.<\/P><\/p>\n

int DrawGLScene(GLvoid)\r\n{\r\n    static GLfloat rot = 0.0f;\r\n   \r\n    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);\r\n    glLoadIdentity();\r\n   \r\n    glInitNames(); \/\/ <1>\r\n   \r\n    glEnable(GL_LIGHTING);\r\n   \r\n    glPushName(100); \/\/ <2-1>\r\n    glPushMatrix();\r\n    glColor3f(1.0f, 0.0f, 0.0f);\r\n    auxWireSphere(0.3);\r\n    glPopMatrix();\r\n    glPopName(); \/\/ <2-2>\r\n   \r\n    glPushName(101); \/\/ <3-1>\r\n    glPushMatrix();\r\n    glColor3f(0.0f, 1.0f, 0.0f);\r\n    glTranslatef(-1.0f, -1.0f, 0.0f);\r\n    auxSolidSphere(0.3f);\r\n    glPopMatrix();\r\n    glPopName(); \/\/ <3-2>\r\n   \r\n    glPushName(102); \/\/ <4-1>\r\n    glPushMatrix(); \r\n    glColor3f(0.0f, 0.0f, 1.0f);\r\n    glTranslatef(1.0f, 1.0f, 0.0f);\r\n    auxSolidSphere(0.3f);\r\n    glPopMatrix();\r\n    glPopName(); \/\/ <4-2>\r\n   \r\n    glPushName(103); \/\/ <5-1>\r\n    glPushMatrix();\r\n    glColor3f(1.0f, 1.0f, 0.0f);\r\n    glTranslatef(-1.0f, 1.0f, 0.0f);\r\n    auxSolidSphere(0.3f);\r\n    glPopMatrix();\r\n    glPopName(); \/\/ <5-2>\r\n   \r\n    glPushName(104); \/\/ <6-1>\r\n    glPushMatrix();\r\n    glColor3f(0.0f, 1.0f, 1.0f);\r\n    glTranslatef(1.0f, -1.0f, 0.0f);\r\n    auxSolidSphere(0.3f);\r\n    glPopMatrix();\r\n    glPopName(); \/\/ <6-2>\r\n   \r\n    glDisable(GL_LIGHTING);\r\n    glPushName(105); \/\/ <7-1>\r\n    glColor3f(0.7f, 0.7f, 1.0f);\r\n    glBegin(GL_LINES);\r\n    glVertex2f(-1.0f, -1.0f);\r\n    glVertex2f(1.0f, -1.0f);\r\n   \r\n    glVertex2f(1.0f, -1.0f);\r\n    glVertex2f(1.0f, 1.0f);\r\n  \r\n    glVertex2f(1.0f, 1.0f);\r\n    glVertex2f(-1.0f, 1.0f);\r\n   \r\n    glVertex2f(-1.0f, 1.0f);\r\n    glVertex2f(-1.0f, -1.0f);\r\n   \r\n    glVertex2f(0.0f, 1.5f);\r\n    glVertex2f(0.0f, -1.5f);\r\n   \r\n    glVertex2f(1.5f, 0.0f);\r\n    glVertex2f(-1.5f, 0.0f);\r\n   \r\n    glVertex2f(1.5f, 1.5f);\r\n    glVertex2f(-1.5f, -1.5f);\r\n    glEnd();\r\n    glPopName(); \/\/ <7-2>\r\n   \r\n    glColor3f(1.0f, 1.0f, 1.0f);\r\n    glBegin(GL_LINES); \/\/ <8>\r\n    glVertex2f(-1.5f, 1.5f);\r\n    glVertex2f(1.5f, -1.5f);\r\n    glEnd();\r\n   \r\n    return TRUE;\r\n}<\/pre>\n
\uc704\uc758 \ucf54\ub4dc\uc911\uc5d0 \ub300\ubd80\ubd84\uc740 \uc774\ubbf8 \uc54c\uace0 \uc788\ub294 \uac83\ub4e4\ub85c \uc124\uba85\uc740 \ud53c\ud558\uae30\ub85c \ud55c\ub2e4. \uc911\uc694\ud55c \ucf54\ub4dc\ub9cc\ub4e4 \uc0b4\ud3b4\ubcf4\uc790.
<1> \ubc88 \ucf54\ub4dc\ub294 Name Stack\uc744 \ucd08\uae30\ud654\ud558\ub294 \ucf54\ub4dc\uc774\ub2e4. Name Stack\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf4\uae30 \uc804\uc5d0 \uba3c\uc800 \uc124\uba85\ub418\uc5b4\uc57c\ud560 \uac83\uc774 \uc788\ub2e4. \uc6b0\ub9ac\uac00 \ub9c8\uc6b0\uc2a4\ub97c \uc774\uc6a9\ud574\uc11c \ubb3c\uccb4\ub97c \uc120\ud0dd\ud588\uc744\ub54c \uc5b4\ub5a4 \ubb3c\uccb4\uc778\uc9c0 \uc544\ub294 \ubc29\ubc95\uc740 \ubb34\uc5c7\uc778\uac00? \uadf8\uac83\uc740 \uac04\ub2e8\ud558\uace0 \uba85\ud655\ud558\uac8c \uadf8 \ubb3c\uccb4\uc5d0 \uc774\ub984\uc744 \uc9c0\uc5b4\uc8fc\ub294 \uac83\uc774\ub2e4. \ubb3c\uccb4\uc758 \uc774\ub984\uc740 \uac04\ub2e8\uc774 \uc22b\uc790\ub85c \uc815\ud574\uc900\ub2e4. Name Stack\uc774\ub780 \ubc14\ub85c \uc774 \ubb3c\uccb4\uc758 \uc774\ub984\uc744 \uc800\uc7a5\ud560 \uacf5\uac04\uc774\ub2e4.<\/P>
<2-1>\ubc88 \ucf54\ub4dc\uc778 glPushName(100)\uc740 \uc774 \ucf54\ub4dc \uc774\ud6c4\ub85c\ubd80\ud130 <2-2>\ucf54\ub4dc, glPopName() \uc774\uc804\uae4c\uc9c0 \uadf8\ub824\uc9c0\ub294 \ubaa8\ub4e0 \ubb3c\uccb4\uc5d0 \ub300\ud574\uc11c \uc9c0\uc815\ub41c \uc774\ub984(\uc5ec\uae30\ub294 100\uc774\ub2e4)\uc744 \ubd99\uc774\uaca0\ub2e4\ub294 \uc758\ubbf8\uc774\ub2e4. \uc989, \ube68\uac04\uc0c9 \uc640\uc774\uc5b4 \uad6c\uc5d0 \ub300\ud574\uc11c 100\uc774\ub77c\ub294 \uc774\ub984\uc744 \ubd99\uc5ec\uc8fc\ub294 \uac83\uc774\ub2e4.<\/P>
<3-1>\ubc88 \ucf54\ub4dc\uc778 glPushName(101)\uc740 \uc774 \ucf54\ub4dc \uc774\ud6c4\ub85c\ubd80\ud130 <3-2>\ucf54\ub4dc, glPopName() \uc774\uc804\uae4c\uc9c0 \uadf8\ub824\uc9c0\ub294 \ubaa8\ub4e0 \ubb3c\uccb4\uc5d0 \ub300\ud574\uc11c \uc9c0\uc815\ub41c \uc774\ub984(\uc5ec\uae30\ub294 101\uc774\ub2e4) \uc744 \ubd99\uc774\uaca0\ub2e4\ub294 \uc758\ubbf8\uc774\ub2e4. \uc989, \ucd08\ub85d\uc0c9 \uc194\ub9ac\ub4dc \uad6c\uc5d0 \ub300\ud574\uc11c 101\uc774\ub77c\ub294 \uc774\ub984\uc744 \ubd99\uc5ec\uc8fc\ub294 \uac83\uc774\ub2e4.<\/P>
<4>~<7>\ubc88 \ucf54\ub4dc\ub4e4\uc740 \ubaa8\ub450 \ub3d9\uc77c\ud55c \uc758\ubbf8\uc774\ubbc0\ub85c \uc124\uba85\uc744 \uc0dd\ub7b5\ud558\uace0 \uc8fc\ubaa9\ud574\uc57c \ud560\uac83\uc740 <8>\ubc88\uc778\ub370 \uc774 \ucf54\ub4dc\uc5d0\ub294 \uc544\ubb34 \uc774\ub984\ub3c4 \ubd99\uc5ec\uc8fc\uc9c0 \uc54a\uc558\ub2e4\ub294 \uc810\uc744 \uae30\uc5b5\ud574 \ub450\uae30 \ubc14\ub780\ub2e4. <8>\ubc88 \ucf54\ub4dc\ub294 \ud558\uc580\uc0c9 \uc120\uc744 \uadf8\ub824\uc8fc\ub294\ub370 \ub098\uc911\uc5d0 \uc774 \ud558\uc580\uc0c9 \uc120\uc744 \ud074\ub9ad\ud558\uc600\uc744\ub54c \uc5b4\ub5a4 \uc77c\uc774 \ubc1c\uc0dd\ud558\uaca0\ub294\uc9c0 \uc0c1\uc0c1\ud574 \ubcf4\uae30 \ubc14\ub780\ub2e4.<\/P>
\uc124\uba85\ud558\uc9c0 \ubabb\ud558\uace0 \ub118\uc5b4\uac04\uac8c \uc788\ub2e4. \ubc14\ub85c InitGL \ud568\uc218\uc758 \ucd08\uae30\ud654 \ubd80\ubd84\uc774\ub2e4. \uac04\ub2e8\ud558\ub2c8 \uc0b4\ud3b4\ubcf4\uae30 \ubc14\ub780\ub2e4. \ucd94\uac00\ub41c \ubd80\ubd84\uc740 \ub530\ub85c \uba85\uc2dc\ud588\ub2e4.<\/P><\/p>\n
int InitGL(GLvoid)\r\n{\r\n    glShadeModel(GL_SMOOTH);\r\n    glClearColor(0.0f, 0.0f, 0.0f, 0.5f);\r\n    glClearDepth(1.0f);\r\n    glEnable(GL_DEPTH_TEST);\r\n    glEnable(GL_COLOR_MATERIAL);\r\n    glEnable(GL_LIGHT0);\r\n    glDepthFunc(GL_LEQUAL);\r\n    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);\r\n   \r\n    return TRUE;\r\n}<\/pre>\n
\uc790 \uc774\ub807\uac8c \ud574\uc11c \ubb3c\uccb4\ub97c \uadf8\ub824\uc92c\uace0 \ubb3c\uccb4\uc5d0 \uc774\ub984\uae4c\uc9c0 \ubd99\uc5ec\uc8fc\ub294 \uac83\uc5d0 \ub300\ud574\uc11c \ubaa8\ub450 \ub05d\ub9c8\ucce4\ub2e4. \uc774\uc81c \ub9c8\uc6b0\uc2a4\ub85c \ud074\ub9ad\ud55c \uc810\uc744 \uc778\uc790\ub85c \ubc1b\uc544 \uadf8 \uc704\uce58\uc5d0 \uc5b4\ub5a4 \ubb3c\uccb4\uac00 \uc788\ub294\uc9c0\ub97c \ud310\ubcc4\ud558\ub294 \ud568\uc218\ub97c \uc791\uc131\ud574\ubcf4\uc790. \ub2e4\uc74c\uc740 \uadf8 \ud568\uc218\uc774\ub2e4.<\/p>\n
void SelectObjects(GLint x, GLint y)\r\n{\r\n    GLuint selectBuff[64];                                \/\/ <1>\r\n    GLint hits, viewport[4];                              \/\/ <2>\r\n   \r\n    glSelectBuffer(64, selectBuff);                       \/\/ <3>\r\n    glGetIntegerv(GL_VIEWPORT, viewport);                 \/\/ <4>\r\n    glMatrixMode(GL_PROJECTION);                          \/\/ <5>\r\n    glPushMatrix();                                       \/\/ <6>\r\n    glRenderMode(GL_SELECT);                              \/\/ <7>\r\n    glLoadIdentity();                                     \/\/ <8>\r\n    gluPickMatrix(x, viewport[3]-y, 2, 2, viewport);      \/\/ <9>\r\n    gluPerspective(45.0f,ratio,0.1f,100.0f);              \/\/ <10>\r\n    glMatrixMode(GL_MODELVIEW);                           \/\/ <11>\r\n    glLoadIdentity();                                     \/\/ <12>\r\n    DrawGLScene();                                        \/\/ <13>\r\n    hits = glRenderMode(GL_RENDER);                       \/\/ <14>\r\n    if(hits>0) ProcessSelect(selectBuff);                 \/\/ <15>\r\n    glMatrixMode(GL_PROJECTION);                          \/\/ <16>\r\n    glPopMatrix();                                        \/\/ <17>\r\n    glMatrixMode(GL_MODELVIEW);                           \/\/ <18>\r\n}<\/pre>\n
\ucc38\uc73c\ub85c \uc124\uba85\ud560\uac8c \ub9ce\ub2e4. \ud558\ub098 \ud558\ub098 \uc9da\uc5b4\ubcf4\ub3c4\ub85d \ud558\uc790.
\n
<1>\ubc88 \ucf54\ub4dc\ub294 \ub098\uc911\uc5d0 \ubb3c\uccb4\uac00 \uc120\ud0dd\ub418\uba74 \uadf8 \uc120\ud0dd\ub41c \ubb3c\uccb4\uc758 \uc774\ub984\uc774 \ubc14\ub85c \uc774 selectBuff\uc5d0 \uc800\uc7a5\ub418\uac8c \ub41c\ub2e4.<\/P>
<2>\ubc88 \ucf54\ub4dc\uc5d0\ub294 \ub450\uac1c\uc758 \ubcc0\uc218\uac00 \uc120\uc5b8\ub418\uc5b4 \uc788\ub2e4. hits \ubcc0\uc218\ub294 \ub9c8\uc6b0\uc2a4\ub85c \ud074\ub9ad\ud574\uc11c \uc120\ud0dd\ub41c \ubb3c\uccb4\uac00 \uba87\uac1c\ub098 \ub418\ub294\uc9c0 \ud558\ub294\uac83\uc778\ub370 \ub9cc\uc57d \ubb3c\uccb4 \ub450\uac1c\uac00 \uacb9\uccd0\uc788\uc744\ub54c \uadf8 \uacb9\uce5c \ubd80\ubd84\uc744 \ud074\ub9ad\ud588\uc744\uc2dc\uc5d0 \ubb3c\uccb4\ub294 \ubaa8\ub450 2\uac1c\uac00 \uc120\ud0dd\ub418\uac8c \ub41c\ub2e4. \uc774\ub54c hits\uc758 \uac12\uc740 2\uac00 \ub420\uac83\uc774\ub2e4. \uadf8\ub9ac\uace0 viewport\ub294 OpenGL\uc744 \ucd08\uae30\ud654\ud558\ub294 \ucf54\ub4dc\uc5d0\uc11c glViewPort\ub77c\ub294 \ud568\uc218\ub97c \uae30\uc5b5\ud558\ub294\uc9c0 \ubaa8\ub974\uaca0\ub2e4. \uadf8 \ud568\uc218\uc5d0\uc11c \uc708\ub3c4\uc6b0\uc758 \ud074\ub77c\uc774\uc5b8\ud2b8 \uc2dc\uc791\uc810\uacfc \ud06c\uae30\ub97c \uba85\uc2dc\ud574\uc90c\uc73c\ub85c\uc368 OpenGL\uc774 \uc0ac\uc6a9\ud558\uac8c \ub418\ub294 \uc601\uc5ed\uc744 \uc54c\ub824\uc8fc\ub294\ub370 \uadf8\ub54c \uc804\ud574 \uc8fc\uc5c8\ub358 \uac12\ub4e4\uc744 \ub2e4\uc2dc \uc5bb\uc5b4\uc640 \uc800\uc7a5\ud574\uc8fc\ub294 \ubcc0\uc218\uc774\ub2e4. viewport[0]\uc5d0\ub294 \uc708\ub3c4\uc6b0\uc758 \ud074\ub77c\uc774\uc5b8\ud2b8 \uc601\uc5ed\uc758 \uc6d0\uc810\uc758 x\uc88c\ud45c\uc778 0\uc774 viewport[1]\uc740 \uc708\ub3c4\uc6b0\uc758 \ud074\ub77c\uc774\uc5b8\ud2b8 \uc601\uc5ed\uc758 \uc6d0\uc810\uc758 y\uc88c\ud45c\uc778 0\uc774 \ub2f4\uae30\uba70 viewport[2]\ub294 \ud074\ub77c\uc774\uc5b8\ud2b8 \uc601\uc5ed\uc758 \ub108\ube44\uac12\uc774 viewport[3]\uc740 \ud074\ub77c\uc774\uc5b8\ud2b8 \uc601\uc5ed\uc758 \ub192\uc774 \uac12\uc774 \ub2f4\uae34\ub2e4.<\/P>
<3>\ubc88 \ucf54\ub4dc\ub294 Select Buffer\ub85c \uc0ac\uc6a9\ub420 \ubc84\ud37c\uc758 \ud06c\uae30\uc640 \uadf8 \ubc84\ud37c\ub85c \uc0ac\uc6a9\ub420 \uba54\ubaa8\ub9ac \uc601\uc5ed\uc744 \uc7a1\uc544\uc8fc\ub294 \uac83\uc774\ub2e4. glSelectBuffer\uc758 \uccab\ubc88\uc9f8 \ubcc0\uc218\uac00 \uadf8 \ud06c\uae30\uc774\uace0 \ub450\ubc88\uc9f8 \ubcc0\uc218\uac00 \uadf8 \uba54\ubaa8\ub9ac \uc601\uc5ed\uc774\ub2e4. \uc5ec\uae30\uc11c\ub294 64\uac1c\ub85c \uc8fc\uc5b4\uc84c\uc73c\uba70 <1>\ubc88 \ucf54\ub4dc\uc5d0\uc11c \uc815\uc758\ud55c selectBuffer\ub97c \uc0ac\uc6a9\ud55c\ub2e4. 64\uac1c\ub97c \uc120\uc5b8\ud588\uc73c\ubbc0 \uc6b0\ub9ac\ub294 \ub3d9\uc2dc\uc5d0 \ucd1d 16\uac1c(64\/4)\uc758 \uacb9\uce5c \ubb3c\uccb4\uc5d0 \ub300\ud574\uc11c\ub3c4 \ud310\ubcc4\ud560 \uc218 \uc788\ub2e4. \ub098\uc911\uc5d0 \ubcf4\uac8c \ub418\uaca0\uc9c0\ub9cc \uc6b0\ub9ac\uac00 \ubb3c\uccb4\ub97c \ud074\ub9ad\ud558\uac8c \ub418\uba74 \ucc98\uc74c \uc120\ud0dd\ub41c \ubb3c\uccb4\ub294 \ubc84\ud37c\uc758 4\ubc88\uc9f8 \uc140\uc5d0 \ud074\ub9ad\ub41c \ubb3c\uccb4\uc758 \uc774\ub984\uc744 \uc800\uc7a5\ud558\uace0 \ub2e4 \ub2e4\uc74c \ubb3c\uccb4\ub294 \ubc84\ud37c\uc758 8\ubc88\uc9f8\uc5d0 \uc800\uc7a5\ub418\uba70 \ub610 \uadf8 \ub2e4\uc74c\uc740 12\ubc88\uc9f8\uc5d0 \uc800\uc7a5\ub418\uac8c \ub41c\ub2e4. \uc774\ub807\uac8c 4\uc758 \ubc30\uc218\ub85c \uc800\uc7a5\ub420 \ubc84\ud37c\uc758 \uc140\uc758 \uc704\uce58\uac00 \uc99d\uac00\ub41c\ub2e4. \uadf8\ub807\ub2e4\uba74 \uadf8 \uc678\uc758 \uc140\ub4e4\uc5d0\ub294 \uc5b4\ub5a4 \uac12\ub4e4\uc774 \uc800\uc7a5\ub418\ub294 \uac83\uc778\uac00? \ud544\uc790\ub3c4 \ubd84\uba85\ud558\uac8c \uc54c\uc9c0 \ubabb\ud558\ubbc0\ub85c \uc5ec\uae30\uc11c \uc18c\uac1c\ud558\uc9c0 \uc54a\uaca0\ub2e4. \ud558\uc9c0\ub9cc \uc5b4\ub5a4 \ubb3c\uccb4\ub97c \uc120\ud0dd\ud588\ub290\ub0d0\ub97c \uc54c\uc544\ubcf4\ub294\ub370\ub294 \uc911\uc694\uce58 \uc54a\uc740 \uac12\ub4e4\uc784\uc5d0 \ud2c0\uc784\uc5c6\ub294 \uac83 \uac19\ub2e4.<\/P>
<4>\ubc88 \ucf54\ub4dc\ub294 <2>\ubc88 \ucf54\ub4dc\uc5d0\uc11c \uc124\uba85\ud55c View Port\uc758 \uc601\uc5ed\uac12\uc744 \uc5bb\uc5b4\uc624\ub294 \uac83\uc774\ub2e4.<\/P>
<5>\ubc88 \ucf54\ub4dc\ub294 Projection Mode\ub85c \uc804\ud658\ub418\ub294\ub370 \uba3c\uc800 \uc5b4\ub5a4 \ubb3c\uccb4\uac00 \uc120\ud0dd\ud558\uac8c \ub418\uc5c8\ub294\uc9c0\ub97c \uc54c\uc544\ubcf4\uae30 \uc704\ud574\uc11c\ub294 \uba3c\uc800 \ubb3c\uccb4\ub97c \uc120\ud0dd\uc744 \uc704\ud55c \ubc84\ud37c \uc601\uc5ed\uc5d0 \ub2e4\uc2dc\uae08 \ubaa8\ub4e0 \ubb3c\uccb4\ub97c \ud55c\ubc88 \ub354 Selection\uc744 \uc704\ud55c \ubc84\ud37c\uc5d0 \uadf8\ub824\uc918\uc57c \ud558\ub294 \uacfc\uc815\uc774 \ud544\uc694\ud558\ub2e4. \ud544\uc790\uac00 \ucc98\uc74c \uc774\uc7a5\uc744 \uc4f8\ub54c \ub9c9\ub9c9\ud588\ub358 \uac83\uc774 \ubc14\ub85c \uc774 \ubd80\ubd84\uc774\ub2e4. \uc5b4\ucc0c\ud558\uc57c \ubaa8\ub4e0 \ubb3c\uccb4\ub97c \ud55c\ubc88\ub354 \uadf8\ub824\uc918\uc57c \ud558\ub294\uc9c0, \uadf8 \ub0b4\ubd80\uc801\uc73c\ub85c \uc5b4\ub5bb\uac8c \ucc98\ub9ac\ub418\ub294\uc9c0, \uc774\ub807\uac8c \ud568\uc73c\ub85c\uc368 \ud504\ub85c\uadf8\ub7a8\uc758 \uc218\ud589\ub2a5\ub825\uc774 \ubc18\uc73c\ub85c \uc904\uc5b4\ub4e4\uc9c0\ub098 \uc54a\uc744\ub7f0\uc9c0(\uac19\uc740 \uc7a5\uba74\uc744 2\ubc88 \uadf8\ub824\uc918\uc57c \ud558\ubbc0\ub85c)\uc640 \uac19\uc740 \uc758\uad6c\uc2ec\uacfc \ubd88\uc548\uac10\uc774 \ud544\uc790\uc758 \uba38\ub9bf\uc18d\uc744 \uc5b4\uc9c0\ub7fd\uac8c \ud588\ub2e4. \uc5b4\ucc0c\ub418\uc5c8\ub4e0 <5>\ucf54\ub4dc\ub294 \ubaa8\ub4e0 \ubb3c\uccb4\ub97c \ub2e4\uc2dc\uae08 \uadf8\ub824\uc8fc\uae30 \uc704\ud574\uc11c \uc77c\ub2e8 Projection Mode \ub85c \ubcc0\ud658\ud558\uace0 Selection\uc744 \uc704\ud55c \ubc84\ud37c\uc758 \ud22c\uc2dc\ubc95\uc744 \uc124\uc815\ud574\uc8fc\ub294 \uac83\uc774\ub2e4.<\/P>
<6>\ubc88 \ucf54\ub4dc\ub294 Projection Mode\uc758 \ud589\ub82c\uac12\uc744 \uc800\uc7a5\ud574 \ub193\ub294 \ucf54\ub4dc\uc774\ub2e4. \ub098\uc911\uc5d0 \ubcf5\uc6d0\ud574\uc57c \ud558\ubbc0\ub85c \ud544\uc694\ud558\ub2e4.<\/P>
<7>\ubc88 \ucf54\ub4dc\ub294 \ubb3c\uccb4\ub97c \uadf8\ub824\uc904\ub54c, \uc989 \ub80c\ub354\ub9c1\ud560\ub54c\uc758 Render Mode\ub97c Selection Buffer\uc5d0 \ub80c\ub354\ub9c1 \ud558\ub3c4\ub85d \uc9c0\uc815\ud558\ub294 \uac83\uc774\ub2e4.<\/P>
<8>\ubc88 \ucf54\ub4dc\ub294 Projection Mode\ub97c \ucd08\uae30\ud654(\ub2e8\uc704 \ud589\ub82c) \uc2dc\ucf1c\uc8fc\ub294 \ucf54\ub4dc\uc774\ub2e4.<\/P>
<9>\ubc88 \ucf54\ub4dc\ub294 \ub0b4\ubd80\uc801\uc73c\ub85c Selection\uc744 \uc704\ud55c Picking \ud589\ub82c\uc744 \uc0dd\uc131\ud574 \uc8fc\ub294 \ucf54\ub4dc\uc778\ub370 \uccab\ubc88\uc9f8 \uc778\uc790\ub294 \ub9c8\uc6b0\uc2a4\ub85c \ud074\ub9ad\ud55c \uacf3\uc758 x\uc88c\ud45c\uc774\uace0 \ub450\ubc88\uc9f8\ub294 y\uc88c\ud45c\uc778\ub370 \ud074\ub77c\uc774\uc5b8\ud2b8 \uc601\uc5ed\uc758 \ub192\uc774 \uac12\uc5d0\uc11c y\uc88c\ud45c\uac12\uc744 \ube7c\uc8fc\uc5c8\ub294\ub370 \uc774\uac83\uc740 OpenGL\uc758 \uc88c\ud45c\uccb4\uacc4\uac00 y\ucd95\uc740 \uc544\ub798\ub85c \uac08\uc218\ub85d \uac10\uc18c\ud558\ub294\uac83\uc5d0 \uae30\uc778\ud55c \uac83\uc774\ub77c \uc9d0\uc791\ud560\uc218\uc788\ub294\ub370 \ud544\uc790\uc758 \ub610 \ub2e4\ub978 \uc0dd\uac01\uc740 OpenGL\uc758 Bug\ub85c \ubcf4\uc778\ub2e4(OpenGL 1.0\uc5d0\uc11c\ub294 \ub2e8\uc9c0 y\uc88c\ud45c\uac12\uc744 \uc0ac\uc6a9\ud558\uc9c0\ub9cc 1.1~1.2\ubd80\ud130\ub294 \uc774 \ubc29\ubc95\uc774 \uc801\uc6a9\ub418\uc9c0 \uc54a\uace0 \ud074\ub77c\uc774\uc5b8\ud2b8 \uc601\uc5ed\uc758 \ub192\uc774 \uac12\uc5d0\uc11c \ube7c\uc918\uc57c\ub9cc \ud558\ub294 \uac83\uc73c\ub85c \ubc14\ub00c\uc5c8\ub2e4). \uc138\ubc88\uc9f8\uc640 \ub124\ubc88\uc9f8 \uac12\uc740 \ub9c8\uc6b0\uc2a4\ub85c \ud074\ub9ad\ud588\uc744\uc2dc\uc5d0 \uaf2d \uadf8 \uc88c\ud45c(x,y)\ub9cc\uc774 \uc544\ub2cc \uadf8 \uc8fc\ubcc0\uc73c\ub85c \uc5bc\ub9c8\ub9cc\ud07c\uc758 \uc704\uce58\uc5d0 \uc788\ub294 \ubb3c\uccb4\uae4c\uc9c0\ub3c4 \uc120\ud0dd\ub418\ub3c4\ub85d \ud558\ub294 \uc5ec\uc720\ubd84\uac12\uc774\ub2e4. \uc989 \uac12\uc744 2\ub85c \uc90c\uc73c\ub85c\uc368 (x,y)\uc704\uce58\ub85c\ubd80\ud130 1~2\ud53d\uc140\uc5d0 \uc704\uce58\ud55c \ubb3c\uccb4\ub3c4 \uc120\ud0dd\ub41c \uac83\uc73c\ub85c \uac04\uc8fc\ud55c\ub2e4. \ub2e4\uc12f\ubc88\uc9f8 \uc778\uc790\ub294 \uc6b0\ub9ac\uac00 \uc55e\uc11c \uad6c\ud55c viewport\uc758 \uac12\uc774\ub2e4.<\/P>
<10>\ubc88 \ucf54\ub4dc\ub294 Projection Mode\uc758 \ud22c\uc601\uac12\uc744 \uc124\uc815\ud558\ub294 \uac83\uc778\ub370 \ub9e8\ucc98\uc74c OpenGL\uc744 \uc124\uc815\ud560\ub54c \uc0ac\uc6a9\ud588\ub358 \ud22c\uc601\uac12\uacfc \ub3d9\uc77c\ud55c \uac12\uc73c\ub85c \uc124\uc815\ud574\uc57c \ud55c\ub2e4. \uadf8\ub798\uc57c \ub611 \uac19\uc740 \uc704\uce58\uc5d0 \ubb3c\uccb4\uac00 \uadf8\ub824\uc9c0\uae30 \ub54c\ubb38\uc774\ub2e4. ratio \ubcc0\uc218\ub294 \uc804\uc5ed \ubcc0\uc218\ub85c\uc368 \ub2e4\uc74c\uacfc \uac19\uc774 \uc120\uc5b8\ub418\uc5b4 \uc788\ub2e4.<\/P><\/p>\n
GLfloat ratio;<\/pre>\n
\uc774 \ubcc0\uc218\uc758 \uac12\uc758 \uc124\uc815\uc740 \uae30\uc874\uc5d0 \uc788\ub294 ReSizeGLScene \ud568\uc218\uc5d0\uc11c \ud574\uc8fc\ub294\ub370 \uadf8 \ud568\uc218\ub97c \uc0b4\ud3b4\ubcf4\uc790.<\/P><\/p>\n
GLvoid ReSizeGLScene(GLsizei width, GLsizei height)\r\n{\r\n    if (height==0) {\r\n        height=1;\r\n    }\r\n   \r\n    glViewport(0,0,width,height);\r\n   \r\n    glMatrixMode(GL_PROJECTION);\r\n    glLoadIdentity();\r\n   \r\n    ratio = (GLfloat)width\/(GLfloat)height; \/\/ NEW\r\n    gluPerspective(45.0f,ratio,0.1f,100.0f); \/\/ MODIFIED\r\n   \r\n    glMatrixMode(GL_MODELVIEW);\r\n    glLoadIdentity();\r\n}<\/pre>\n
<11>\ubc88 \ucf54\ub4dc\ub294 \uc774\uc81c \ubb3c\uccb4\ub97c \uadf8\ub9ac\uae30 \uc704\uc5d0 Model View \ubaa8\ub4dc\ub85c \uc804\ud654\ud558\ub294 \uac83\uc774\ub2e4.
<12>\ubc88 \ucf54\ub4dc\ub294 Model View\ub97c \ub2e8\uc704\ubca1\ud130\ub85c \ucd08\uae30\ud654\ud55c\ub2e4.<\/P>
<13>\ubc88 \ucf54\ub4dc\ub294 DrawGLScene \ud568\uc218\ub97c \ud638\ucd9c\ud574\uc11c \ud55c\ubc88 \ub354 Selection Buffer\uc5d0 \uadf8\ub824\uc900\ub2e4.<\/P>
<14>\ubc88 \ucf54\ub4dc\ub294 \uc774\uc81c \ubb3c\uccb4\ub97c Selection Buffer\uc5d0 \uadf8\ub9ac\uc9c0 \ub9d0\uace0 \uc77c\ubc88\uc801\uc778 Render Buffer\uc5d0 \ubb3c\uccb4\ub97c \uadf8\ub9ac\ub77c\ub294 \uac83\uc774\ub2e4. \uc774 \ucf54\ub4dc\uc758 \ub530 \ub2e4\ub978 \uc911\uc694\ud55c \uac83\uc778 \uadf8 \ubc18\ud658\uac12\uc5d0 \uc788\ub2e4. \uba87\uac1c\uc758 \ubb3c\uccb4\uac00 \uc120\ud0dd\ub418\uc5c8\ub294\uc9c0\ub97c \ubc18\ud658\ud558\uae30 \ub54c\ubb38\uc5d0 \uc774 \uac12\uc744 \uc870\uc0ac\ud568\uc73c\ub85c\uc368 \ubb3c\uccb4\uac00 \uc120\ud0dd\ub418\uc5c8\ub294\uc9c0\ub97c \uc54a\ub418\uc5c8\ub294\uc9c0\ub97c \ud310\ubcc4\ud560\uc218\uc788\ub2e4.<\/P>
<15>\ubc88 \ucf54\ub4dc\uac00 hits \uac12\uc744 \uc870\uc0ac\ud558\uc5ec \ub2e4\uc2dc ProcessSelect\ub77c\ub294 \uc0c8\ub85c \ub9cc\ub4e0 \ud568\uc218\ub97c \ud1b5\ud574\uc11c \uc120\ud0dd\ub41c \ubb3c\uccb4\ub97c \uc870\uc0ac\ud558\uac8c \ub41c\ub2e4.<\/P>
<16>\ubc88 \ucf54\ub4dc\uc640 <17>\ucf54\ub4dc\ub294 Projection Mode\ub97c \ub2e4\uc2dc \uc6d0\uc0c1\ud0dc\ub85c \ubcf5\uadc0\ud558\uae30 \uc704\ud55c \uac83\uc774\ub2e4.<\/P>
<18>\ubc88 \ucf54\ub4dc\ub294 \ub2e4\uc2dc Model View \ubaa8\ub4dc\ub85c \uc804\ud658\ud558\ub294 \ucf54\ub4dc\uc774\ub2e4.<\/P>
\ucc38\uc73c\ub85c \uc9e7\uc740 \ucf54\ub4dc\uc774\uc9c0\ub9cc \uc774\ub9ac \uc800\ub9ac \ube59\ube59 \ub3c4\ub294 \uc815\ub9ac\uac00 \uc54a\ub418\ub294 \ucf54\ub4dc\ub77c\uace0 \uc0dd\uac01\ud558\ub294 \ub3c5\uc790\uac00 \uc788\uc744\uc9c0\ub3c4 \ubaa8\ub974\uaca0\ub2e4. \ud544\uc790 \uc5ed\uc2dc \ucc98\uc74c\uc5d0 \uadf8\ub807\uac8c \ub9c8\ucc2c\uac00\uc9c0\uc600\ub2e4. Selection\uc758 \ub0b4\ubd80 \uacfc\uc815\uc744 \uc54c\uc218\uc5c6\uae30 \ub54c\ubb38\uc778\uac83 \uac19\ub2e4. \ud558\uc9c0\ub9cc Selectiion \uc744 \uc704\ud55c \ucf54\ub4dc\ub294 \uc704\uc758 \ud615\ud0dc\uac00 \ud56d\uc0c1 \ubc18\ubcf5\uc801\uc73c\ub85c \ub418\ud480\uc774 \ub418\ubbc0\ub85c \uc774\ud574\uac00 \uac00\uc9c0 \uc54a\uc73c\uba74 \uadf8\ub0e5 \uc774\ub807\ub2e4 \ub77c\uace0 \uadf8\ub0e5 \uc0ac\uc6a9\ud574\ub3c4 \ub420 \uac83\uac19\ub2e4.<\/P>
\uc774\uc81c <15>\ubc88 \ucf54\ub4dc\uc5d0\uc11c \uc0c8\ub86d\uac8c \uc120\ubcf4\uc600\ub358 ProcessSelect \ud568\uc218\ub97c \ubcf4\ub3c4\ub85d \ud558\uc790. \ub2e4\uc74c\uc774 \uadf8 \ud568\uc218\uc774\ub2e4.<\/P><\/p>\n
void ProcessSelect(GLuint index[64])\r\n{\r\n  switch(index[3]) {\r\n    case 100: MessageBox(hWnd, \"Red Wire Sphere\", \"Selection\", MB_OK); break;\r\n    case 101: MessageBox(hWnd, \"Green Solid Sphere\", \"Selection\", MB_OK); break;\r\n    case 102: MessageBox(hWnd, \"Blue Solid Sphere\", \"Selection\", MB_OK); break;\r\n    case 103: MessageBox(hWnd, \"Yellow Solid Sphere\", \"Selection\", MB_OK); break;\r\n    case 104: MessageBox(hWnd, \"Cyan Solid Sphere\", \"Selection\", MB_OK); break;\r\n    case 105: MessageBox(hWnd, \"Line\", \"Selection\", MB_OK); break;\r\n   \r\n    default: MessageBox(hWnd, \"What?\", \"Selection\", MB_OK); break;\r\n  }\r\n}<\/pre>\n
\uc774 \ud568\uc218\ub294 \uc120\ud0dd\ub41c \ud558\ub098\uc758 \ubb3c\uccb4\uc5d0 \ub300\ud574\uc11c\ub9cc \uac80\uc0ac\ud558\ub3c4\ub85d \ub418\uc5b4\uc838 \uc788\ub2e4. \uc65c\ub0d0\ud558\uba74 \uc804\ub2ec\ubc1b\uc740 index \ubc30\uc5f4\uc5d0\uc11c 3\ubc88 \uc140\ub9cc\uc744 \uac80\uc0ac\ud588\uae30\ub54c\ubb38\uc774\ub2e4. \ub9cc\uc57d \uc120\ud0dd\ub41c \ub450\uac1c \uc774\uc0c1\uc77c \uacbd\uc6b0 4\ubc88\uc9f8 \uc140, 8\ubc88\uc9f8 \uc140, 12\ubc88\uc9f8 \uc140, … \ub4f1\uc758 \uc140\uc5d0 \uadf8 \uc120\ud0dd\ub41c \ubb3c\uccb4\uc758 \uc774\ub984\uc774 \uc800\uc7a5\ub41c\ub2e4\uace0 \uc124\uba85\ud55c \uc801\uc774 \uc788\ub2e4. \uae30\uc5b5\ud558\ub294\uac00? ProcessSelect \ud568\uc218\uc758 \uad6c\uc131\uc740 \uba85\ud655\ud558\uace0 \uc27d\ub2e4.<\/P>
\uac70\uc758 \ubaa8\ub4e0 \uac83\uc774 \uc644\uc131\ub418\uc5c8\ub2e4. \uc774\uc81c \ub9c8\uc6b0\uc2a4\uac00 \ud074\ub9ad\ub418\ub294 \uc774\ubca4\ud2b8\uac00 \ubc1c\uc0dd\ud560\ub54c \uc6b0\ub9ac\uac00 \uc55e\uc11c \ub9cc\ub4e0 SelectObject \ud568\uc218\ub97c \uc0ac\uc6a9\ud558\ub294 \ubd80\ubd84\ub9cc\uc744 \ub9cc\ub4e4\uba74 \ub05d\uc774\ub2e4.<\/P>
WndProc \ud568\uc218\uac00 \uc708\ub3c4\uc6b0\uc758 \ubaa8\ub4e0 \uba54\uc138\uc9c0\ub97c \ucc98\ub9ac\ud558\ub294 \ud568\uc218\uc778\ub370 \ub9c8\uc6b0\uc2a4\uc758 \uc67c\ucabd \ubc84\ud2bc\uc774 \ub20c\ub7ec\uc9c0\uba74 \ubc1c\uc0dd\ud558\ub294 \uba54\uc138\uc9c0\uc758 \uc774\ub984\uc740 WM_LBUTTONDOWN\uc774\ub2e4. \ub2e4\uc74c\uacfc \uac19\uc740 \ucf54\ub4dc\ub97c \ucd94\uac00\ud558\uc790.<\/P><\/p>\n
case WM_LBUTTONDOWN:\r\n{\r\n    SelectObjects(LOWORD(lParam), HIWORD(lParam));\r\n    return 0;\r\n}<\/pre>\n
lParam\uc758 \ud558\uc704\uc6cc\ub4dc \uac12\uc774 x\uc88c\ud45c\uc774\uace0 lParam\uc758 \uc0c1\uc704\uc6cc\ub4dc \uac12\uc774 y\uc88c\ud45c\uc758 \uac12\uc778 \uac83\uc744 \ucc38\uace0\ud558\uae30 \ubc14\ub780\ub2e4.
\n
\uc790, \uc774\uc81c \uc2e4\ud589\ud574\ubcf4\uace0 \uadf8 \uacb0\uacfc\ub97c \ubcf4\ub77c~!!! \ubaa8\ub4e0 \uac83\uc774 \uc774\ub8e8\uc5b4\uc84c\ub294\uac00? (Do All come true?)<\/P><\/p>\n
<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\uc774 \uc7a5\uc5d0\uc11c\ub294 OpenGL\uc5d0\uc11c \uc6b0\ub9ac\uac00 \uc5b4\ub5a4 \ubb3c\uccb4\ub4e4\ub97c \ud654\uba74\uc0c1\uc5d0 \uadf8\ub838\uace0 \ud654\uba74\uc0c1\uc758 \ubb3c\uccb4\ub4e4\uc911\uc5d0 \ud558\ub098\uc758 \ubb3c\uccb4\ub97c \ub9c8\uc6b0\uc2a4\ub85c \ud074\ub9ad\ud588\uc744\ub54c \uc5b4\ub5a4 \ubb3c\uccb4\uac00 \ud074\ub9ad\ub418\uc5c8\ub294\uc9c0 \uc989, \uc5b4\ub5a4 \ubb3c\uccb4\uac00 \ud53d\ud0b9(Picking)\ub418\uc5c8\ub294\uc9c0\ub97c \uc544\ub294 \ubc29\ubc95\uc5d0 \ub300\ud574\uc11c \uc54c\uc544\ubcf8\ub2e4. OpenGL\uc5d0\uc11c \uc0ac\uc6a9\uc790\uc640\uc758 \ub300\ud654\ub97c \uc704\ud55c \uc544\uc8fc \uac15\ub825\ud55c \ubc29\ubc95\uc774\uace0 \uc190\uc26c\uc6b4 \ubc29\ubc95\uc774\ub2e4.\ud604\uc81c \ud544\uc790\ub294 \uc774 Selection \uae30\ubc95\uc5d0 \ub300\ud55c \ucda9\ubd84\ud55c \uc0ac\uc6a9\ubc95\ub9cc\uc744 \uc54c\uace0 \uc788\uc744\ubfd0\uc774\uba70 \uadf8 \ub0b4\ubd80\uc801\uc778 \uc6d0\ub9ac\uc5d0 \ub300\ud574\uc11c\ub294 \uc774\ud574\ud558\uc9c0 \ubabb\ud558\uace0 \uc788\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \uc6d0\ub9ac\uc5d0 \ub300\ud574 \uc124\uba85\uc740 \ud604\uc7ac\ub85c\uc368\ub294 … <\/p>\n
\ub354 \ubcf4\uae30 “[OpenGL Tutorial] Selection”<\/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-53","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\/53","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=53"}],"version-history":[{"count":4,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/53\/revisions"}],"predecessor-version":[{"id":3823,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/53\/revisions\/3823"}],"wp:attachment":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=53"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=53"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=53"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}