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Diffstat (limited to 'nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/lookat.gl')
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diff --git a/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/lookat.gl b/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/lookat.gl deleted file mode 100644 index 09189de06..000000000 --- a/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/lookat.gl +++ /dev/null @@ -1,108 +0,0 @@ -_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(LookAt, define a viewing transformation) -_names(LookAt) -.EQ -delim $$ -.EN -.SH PARAMETERS -_phead(_param1 _param2 _param3) -Specifies the position of the eye point. -_phead(_param4 _param5 _param6) -Specifies the position of the reference point. -_phead(_param7 _param8 _param9) -Specifies the direction of the \f2up\fP vector. -.SH DESCRIPTION -_cmnd creates a viewing matrix derived from an eye point, a reference -point indicating the center of the scene, and an \f2UP\fP vector. -.P -The matrix -maps the reference point to the negative \f2z\fP axis and the -eye point to the origin. -When a typical projection matrix is used, -the center of the scene therefore maps to the center of the viewport. -Similarly, the direction described by the \f2UP\fP -vector projected onto the viewing plane is mapped to the positive \f2y\fP -axis so that it points upward in the viewport. -The \f2UP\fP vector must not be parallel to the line of sight from the -eye point to the reference point. -.P -Let -.sp -.EQ -F ~=~ left ( down 20 { ~ matrix { - ccol {_eqnparam4 above _eqnparam5 above _eqnparam6} - ccol { ~-~ above ~-~ above ~-~} - ccol {_eqnparam1 above _eqnparam2 above _eqnparam3} -} } ~~ right ) - -.EN - -.sp -Let \f2UP\fP be the vector $(_eqnparam7, _eqnparam8, _eqnparam9)$. -.P -Then normalize as follows: -.EQ -f ~=~ F over {|| F ||} -.EN -.P -.EQ -UP sup prime ~=~ UP over {|| UP ||} -.EN -.sp -.P -Finally, let $s ~=~ f ~times~ UP sup prime$, and $u ~=~ s ~times~ f$. -.P -.sp -M is then constructed as follows: -.EQ -M ~=~ left ( matrix { - ccol { ~s[0] above ~u[0] above -f[0] above 0 } - ccol { ~s[1] above ~u[1] above -f[1] above 0 } - ccol { ~s[2] above ~u[2] above -f[2] above 0 } - ccol { 0 above 0 above 0 above 1 } -} ~~right ) -.EN -.P -and _cmnd is equivalent to -.Ex -glMultMatrixf(M); -glTranslated (-eyex, -eyey, -eyez); -.Ee -.SH SEE ALSO -_glcmnd(Frustum), _cmnd(Perspective) |