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gluunproject4(3g) [centos man page]

GLUUNPROJECT4(3G)						   OpenGL Manual						 GLUUNPROJECT4(3G)

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 AUTHORS 06/10/2014 GLUUNPROJECT4(3G)

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GLDEPTHRANGE(3G)						  [FIXME: manual]						  GLDEPTHRANGE(3G)

glDepthRange - specify mapping of depth values from normalized device coordinates to window coordinates C SPECIFICATION
void glDepthRange(GLdouble nearVal, GLdouble farVal); void glDepthRangef(GLfloat nearVal, GLfloat farVal); PARAMETERS
nearVal Specifies the mapping of the near clipping plane to window coordinates. The initial value is 0. farVal Specifies the mapping of the far clipping plane to window coordinates. The initial value is 1. DESCRIPTION
After clipping and division by w, depth coordinates range from -1 to 1, corresponding to the near and far clipping planes. glDepthRange specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates. Regardless of the actual depth buffer implementation, window coordinate depth values are treated as though they range from 0 through 1 (like color components). Thus, the values accepted by glDepthRange are both clamped to this range before they are accepted. The setting of (0,1) maps the near plane to 0 and the far plane to 1. With this mapping, the depth buffer range is fully utilized. NOTES
It is not necessary that nearVal be less than farVal. Reverse mappings such as nearVal = 1, and farVal = 0 are acceptable. The type of the nearVal and farVal parameters was changed from GLclampf to GLfloat for glDepthRangef and from GLclampd to GLdouble for glDepthRange. This change is transparent to user code and is described in detail on the removedTypes() page. ASSOCIATED GETS
glGet() with argument GL_DEPTH_RANGE SEE ALSO
glDepthFunc(), glPolygonOffset(), glViewport(), removedTypes() COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see [FIXME: source] 05/30/2012 GLDEPTHRANGE(3G)
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