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author | Reinhard Tartler <siretart@tauware.de> | 2011-10-10 17:43:39 +0200 |
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committer | Reinhard Tartler <siretart@tauware.de> | 2011-10-10 17:43:39 +0200 |
commit | f4092abdf94af6a99aff944d6264bc1284e8bdd4 (patch) | |
tree | 2ac1c9cc16ceb93edb2c4382c088dac5aeafdf0f /nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/evalpoint.gl | |
parent | a840692edc9c6d19cd7c057f68e39c7d95eb767d (diff) | |
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Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1
Summary: Imported nx-X11-3.1.0-1.tar.gz
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Diffstat (limited to 'nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/evalpoint.gl')
-rw-r--r-- | nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/evalpoint.gl | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/evalpoint.gl b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/evalpoint.gl new file mode 100644 index 000000000..34dcb717c --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/mangl/standard/evalpoint.gl @@ -0,0 +1,111 @@ +_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_ 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(EvalPoint,generate and evaluate a single point in a mesh) +_names(EvalPoint,[12]) +.EQ +delim $$ +.EN +.SH PARAMETERS +_phead(_param1) +Specifies the integer value for grid domain variable $i$. +_phead(_param2) +Specifies the integer value for grid domain variable $j$ +(_cmnd(EvalPoint2) only). +.SH DESCRIPTION +_cmnd(MapGrid) and _cmnd(EvalMesh) are used in tandem to efficiently +generate and evaluate a series of evenly spaced map domain values. +_cmnd can be used to evaluate a single grid point in the same gridspace +that is traversed by _cmnd(EvalMesh). +Calling _cmnd(EvalPoint1) is equivalent to calling +.nf +.IP +\f7 +glEvalCoord1( i$^cdot^DELTA u ~+~ u sub 1$ ); +\fP +.RE +.fi +where +.sp +.in +$DELTA u ~=~ ( u sub 2 - u sub 1 ) ^/^ n$ +.in 0 +.sp +.P +and $n$, $u sub 1$, and $u sub 2$ +are the arguments to the most recent _cmnd(MapGrid1) command. +The one absolute numeric requirement is that if $i~=~n$, +then the value computed from +$i ^cdot^ DELTA u ~+~ u sub 1$ is exactly $u sub 2$. +.P +In the two-dimensional case, _cmnd(EvalPoint2), let +.nf +.IP +$DELTA u ~=~ mark ( u sub 2 - u sub 1 ) ^/^ n$ +.sp +$DELTA v ~=~ mark ( v sub 2 - v sub 1 ) ^/^ m,$ +.RE +.fi +.P +where $n$, $u sub 1$, $u sub 2$, $m$, $v sub 1$, and $v sub 2$ +are the arguments to the most recent _cmnd(MapGrid2) command. +Then the _cmnd(EvalPoint2) command is equivalent to calling +.nf +.IP +\f7 +glEvalCoord2( i$^cdot^DELTA u ~+~ u sub 1$, j$^cdot^DELTA v ~+~ v sub 1$ ); +\fP +.RE +.fi +The only absolute numeric requirements are that if $i~=~n$, +then the value computed from +$i ^cdot^DELTA u ~+~ u sub 1$ is exactly $u sub 2$, +and if $j~=~m$, then the value computed from +$i ^cdot^DELTA v ~+~ v sub 1$ is exactly $v sub 2$. +.SH ASSOCIATED GETS +_cmnd(Get) with argument _const(MAP1_GRID_DOMAIN) +.br +_cmnd(Get) with argument _const(MAP2_GRID_DOMAIN) +.br +_cmnd(Get) with argument _const(MAP1_GRID_SEGMENTS) +.br +_cmnd(Get) with argument _const(MAP2_GRID_SEGMENTS) +.SH SEE ALSO +_cmnd(EvalCoord), +_cmnd(EvalMesh), +_cmnd(Map1), +_cmnd(Map2), +_cmnd(MapGrid) |