Query: gluunproject4
OS: centos
Section: 3g
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
GLUUNPROJECT4(3G) OpenGL Manual GLUUNPROJECT4(3G)NAMEgluUnProject4 - map window and clip coordinates to object coordinatesC SPECIFICATIONGLint 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);PARAMETERSwinX, 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.DESCRIPTIONgluUnProject4 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.NOTESgluUnProject4 is available only if the GLU version is 1.3 or greater.SEE ALSOgluProject(), gluUnProject(), glFeedbackBuffer(), glGet()COPYRIGHTCopyright (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/.AUTHORSopengl.org opengl.org 06/10/2014 GLUUNPROJECT4(3G)
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