Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / vrml-1.0.13 / vrml_demo_tutorial_1.m

diff --git a/octave_packages/vrml-1.0.13/vrml_demo_tutorial_1.m b/octave_packages/vrml-1.0.13/vrml_demo_tutorial_1.m
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+## Copyright (C) 2002-2009 Etienne Grossmann <etienne@egdn.net>
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 3 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, see <http://www.gnu.org/licenses/>.
+
+printf (["\n",\
+        "    VRML Mini-HOWTO's first listing\n",\
+        "    Display a quadratic surface w/ 31 x 31 points\n\n"]);
+
+printf (["    Reminder of FreeWRL keystrokes and mouse actions :\n"\
+        "      q : quit\n",\
+        "      w : switch to walk mode\n",\
+        "      e : switch to examine mode\n",\
+        "      h : toggle headlights on or off\n",\
+        "      drag left mouse : rotate (examine mode) or translate\n",\
+        "          (walk mode).\n",\
+        "      drag right mouse : zoom (examine mode) or translate\n",\
+        "          (walk mode).\n",\
+        "\n"]);
+
+## Listing 1
+
+x = linspace (-1,1,31);
+
+[xx,yy] = meshgrid (x,x);
+
+zz = xx.^2 + yy.^2;
+
+vmesh (zz);
+
+## Variant of listing 1
+
+printf ("    Hit a key to see the variant of listing 1\n\n");
+
+pause
+
+vmesh (zz,"checker",[5,-2],"col",[1 0 0;0.7 0.7 0.7]', "emit",0);
+
+vmesh (zz,"checker",[5,-2],"col",[1 0 0;0.7 0.7 0.7]', "emit",0);
+
+printf ("    Another one, just with 7 x 7 points\n");
+
+x = linspace (-1,1,7);
+
+[xx,yy] = meshgrid (x,x);
+
+zz = 2 - xx.^2 - yy.^2;
+
+printf ("    Now, with steps, then barss\n");
+
+vmesh (zz);
+
+vmesh (zz,"steps");
+
+vmesh (zz,"bars");