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diff --git a/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/tessnormal.gl b/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/tessnormal.gl new file mode 100644 index 000000000..aae2c9a76 --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/tessnormal.gl @@ -0,0 +1,78 @@ +_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(TessNormal, specify a normal for a polygon) +_names(TessNormal) +.EQ +delim $$ +.EN +.SH PARAMETERS +_phead(_param1) +Specifies the tessellation object (created with _cmnd(NewTess)). +_phead(_param2) +Specifies the first component of the normal. +_phead(_param3) +Specifies the second component of the normal. +_phead(_param4) +Specifies the third component of the normal. +.SH DESCRIPTION +_cmnd describes a normal for a polygon that the program is defining. +All input data will be projected onto a plane perpendicular to one of +the three coordinate axes before tessellation and all output triangles +will be oriented CCW with +respect to the normal (CW orientation can be obtained by reversing the +sign of the supplied normal). For example, if you know that all polygons +lie in the x-y plane, call _cmnd(TessNormal)(tess, 0.0, 0.0, 1.0) +before rendering any polygons. +.P +If the supplied normal is (0.0, 0.0, 0.0) (the initial value), the normal is +determined as follows. The direction of the normal, up to its sign, is +found by fitting a plane to the vertices, without regard to how the +vertices are connected. It is expected that the input data lies approximately +in the plane; otherwise, projection perpendicular to one of the three +coordinate axes may substantially change the geometry. The sign of the +normal is chosen so that the sum of the signed areas of all input +contours is nonnegative (where a CCW contour has positive area). +.P +The supplied normal persists until it is changed by another call to +_cmnd(TessNormal). +.SH SEE ALSO +_cmnd(TessBeginPolygon), +_cmnd(TessEndPolygon) + + + |