gluunproject(3g) [centos man page]
GLUUNPROJECT(3G) OpenGL Manual GLUUNPROJECT(3G) NAME
gluUnProject - map window coordinates to object coordinates C SPECIFICATION
GLint gluUnProject(GLdouble winX, GLdouble winY, GLdouble winZ, const GLdouble * model, const GLdouble * proj, const GLint * view, GLdouble* objX, GLdouble* objY, GLdouble* objZ); PARAMETERS
winX, winY, winZ Specify the window coordinates to be mapped. model Specifies the modelview matrix (as from a glGetDoublev() call). proj Specifies the projection matrix (as from a glGetDoublev() call). view Specifies the viewport (as from a glGetIntegerv() call). objX, objY, objZ Returns the computed object coordinates. DESCRIPTION
gluUnProject maps the specified window coordinates into object coordinates using model, proj, and view. The result is stored in objX, objY, and objZ. A return value of GLU_TRUE indicates success; a return value of GLU_FALSE indicates failure. To compute the coordinates objX objY objZ, gluUnProject multiplies the normalized device coordinates by the inverse of model * proj as follows: objX objY objZ W = INV P M 2 winX - view 0 view 2 - 1 2 winY - view 1 view 3 - 1 2 winZ - 1 1INV denotes matrix inversion. W is an unused variable, included for consistent matrix notation. SEE ALSO
gluProject(), glGet() COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/. AUTHORS
opengl.org opengl.org 06/10/2014 GLUUNPROJECT(3G)
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GLUUNPROJECT4(3G) OpenGL Manual GLUUNPROJECT4(3G) NAME
gluUnProject4 - map window and clip coordinates to object coordinates C SPECIFICATION
GLint gluUnProject4(GLdouble winX, GLdouble winY, GLdouble winZ, GLdouble clipW, const GLdouble * model, const GLdouble * proj, const GLint * view, GLdouble nearVal, GLdouble farVal, GLdouble* objX, GLdouble* objY, GLdouble* objZ, GLdouble* objW); PARAMETERS
winX, winY, winZ Specify the window coordinates to be mapped. clipW Specify the clip w coordinate to be mapped. model Specifies the modelview matrix (as from a glGetDoublev() call). proj Specifies the projection matrix (as from a glGetDoublev() call). view Specifies the viewport (as from a glGetIntegerv() call). nearVal, farVal Specifies the near and far planes (as from a glGetDoublev() call). objX, objY, objZ, objW Returns the computed object coordinates. DESCRIPTION
gluUnProject4 maps the specified window coordinatesi: winX, winY, and winZ and its clip w coordinate clipW into object coordinates objX objY objZ objW using model, proj, and view. clipW can be other than 1 as for vertices in glFeedbackBuffer() when data type GLU_4D_COLOR_TEXTURE is returned. This also handles the case where the nearVal and farVal planes are different from the default, 0 and 1, respectively. A return value of GLU_TRUE indicates success; a return value of GLU_FALSE indicates failure. To compute the coordinates objX objY objZ objW, gluUnProject4 multiplies the normalized device coordinates by the inverse of model * proj as follows: objX objY objZ objW = INV P M 2 winX - view 0 view 2 - 1 2 winY - view 1 view 3 - 1 2 winZ - nearVal farVal - nearVal - 1 clipW INV denotes matrix inversion. gluUnProject4 is equivalent to gluUnProject() when clipW is 1, nearVal is 0, and farVal is 1. NOTES
gluUnProject4 is available only if the GLU version is 1.3 or greater. SEE ALSO
gluProject(), gluUnProject(), glFeedbackBuffer(), glGet() COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/. AUTHORS
opengl.org opengl.org 06/10/2014 GLUUNPROJECT4(3G)