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Diffstat (limited to 'nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/unproject4.gl')
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diff --git a/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/unproject4.gl b/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/unproject4.gl new file mode 100644 index 000000000..37faf217d --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/unproject4.gl @@ -0,0 +1,102 @@ +_C_ License Applicability. Except to the extent portions of this file are +_C_ made subject to an alternative license as permitted in the SGI Free +_C_ Software License B, Version 1.1 (the "License"), the contents of this +_C_ file are subject only to the provisions of the License. You may not use +_C_ this file except in compliance with the License. You may obtain a copy +_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 +_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: +_C_ +_C_ http://oss.sgi.com/projects/FreeB +_C_ +_C_ Note that, as provided in the License, the Software is distributed on an +_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS +_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND +_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A +_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT. +_C_ +_C_ Original Code. The Original Code is: OpenGL Sample Implementation, +_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, +_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. +_C_ Copyright in any portions created by third parties is as indicated +_C_ elsewhere herein. All Rights Reserved. +_C_ +_C_ Additional Notice Provisions: The application programming interfaces +_C_ established by SGI in conjunction with the Original Code are The +_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released +_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version +_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X +_C_ Window System(R) (Version 1.3), released October 19, 1998. This software +_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation +_C_ published by SGI, but has not been independently verified as being +_C_ compliant with the OpenGL(R) version 1.2.1 Specification. +_C_ +_C_ $Date: 2004/03/14 08:29:09 $ $Revision: 1.1.1.4 $ +_C_ The first character in this file must be an '_'! +_C_ Anything on a line after _C_ is ignored +_define(_filters,eqn)_C_ +_C_ eqn is automatically replaced with neqn for nroff +_header(UnProject4, map window and clip coordinates to object coordinates) +_names(UnProject4) +.EQ +delim $$ +.EN +.SH PARAMETERS +_phead(_param1 _param2 _param3) +Specify the window coordinates to be mapped. +_phead(_param4) +Specify the clip w coordinate to be mapped. +_phead(_param5) +Specifies the modelview matrix (as from a _glcmnd(GetDoublev) call). +_phead(_param6) +Specifies the projection matrix (as from a _glcmnd(GetDoublev) call). +_phead(_param7) +Specifies the viewport (as from a _glcmnd(GetIntegerv) call). +_phead(_param8 _param9) +Specifies the near and far planes (as from a _glcmnd(GetDoublev) call). +_phead(_param10 _param11 _param12 _param13) +Returns the computed object coordinates. +.SH DESCRIPTION +_cmnd maps the specified window coordinates _param1, _param2 and _param3 +and its clip w coordinate _param4 +into object +coordinates (_param10, _param11, _param12, _param13) +using _param5, _param6 and _param7. _param4 can be other than +1 as for vertices in _glcmnd(FeedbackBuffer) when data type +_const(4D_COLOR_TEXTURE) is returned. +This also handles the case +where the _param8 and _param9 planes are different from the default, +0 and 1, respectively. +A return +value of _const(TRUE) indicates success; a return value of _const(FALSE) +indicates failure. +.P +To compute the coordinates (_param10, _param11, _param12 and _param13), +_cmnd multiplies the normalized device coordinates by the inverse of +_param5*_param6 as follows: + +.P +.ce +.EQ +left ( down 70 {cpile { ~_eqnparam10 above ~_eqnparam11 above ~_eqnparam12 +above ~_eqnparam13}} ~~ right ) ~=~ INV(P M) +left ( down 140 {cpile { +{ {2(_eqnparam1 ~-~ _eqnparam7[0])} over {_eqnparam7[2]} ~-~ 1 } +above +{ {2(_eqnparam2 ~-~ _eqnparam7[1])} over {_eqnparam7[3]} ~-~ 1 } +above +{ {2(_eqnparam3 ~-~ _eqnparam8)} over {(_eqnparam9 ~-~ _eqnparam8)} ~-~ 1 } +above +_eqnparam4}} ~~ right ) +.EN +.sp +$INV()$ denotes matrix inversion. +.P +_cmnd is equivalent to _cmnd(UnProject) when _param4 is 1, _param8 is 0 and +_param9 is 1. +.SH NOTES +_cmnd is available only if the GLU version is 1.3 or greater. +.SH SEE ALSO +_glcmnd(Get), +_glcmnd(FeedbackBuffer), +_cmnd(Project), +_cmnd(UnProject) |