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## Copyright (C) 2002-2009 Etienne Grossmann <etienne@cs.uky.edu>
##
## 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");