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## Copyright (C) 2002 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/>.
## Test that vrml_faces works with "tex" option
1;
## Tetrahedron : Vertices
x = [ 1 1 -1 0;
-1 1 0 0;
-1 -1 -1 1];
## Tetrahedron : Faces
trg = [1 2 3 1;
2 3 1 2;
4 4 4 3];
trgl = {[1 2 4],[2 3 4],[3 1 4],[1 2 3]};
slight = vrml_PointLight ("location", [0,5,0]);
if 1
s1 = vrml_faces (x, trg);
printf ("Going to show a tetrahedron\n");
printf (["\n If nothing appears, it may be due to problems",...
"\n with your FreeWRL installation\n"]);
vrml_browse ([slight, s1]);
printf ("Press a key in this terminal when done\n");pause;
end
if 1
s1 = vrml_faces (x, trgl,"col",[1,0.5,0.5]);
printf ("Going to show almost the same tetrahedron\n");
printf (["\n If nothing appears, it may be due to problems",...
"\n with your FreeWRL installation\n"]);
vrml_browse ([slight, s1]);
printf ("Press a key in this terminal when done\n");pause;
end
if 1
s1 = vrml_faces (x, trg, "col",[1 0 0 1;0 1 0 1;0 0 1 1]);
printf ("Coloring the vertices\n");
vrml_browse ([slight, s1]);
printf ("Press a key in this terminal when done\n");pause;
end
if 1
s1 = vrml_faces (x, trg, "col",[1 0 0 1;0 1 0 1;0 0 1 1],"colorPerVertex",0);
printf ("Coloring the faces\n");
vrml_browse ([slight, s1]);
printf ("Press a key in this terminal when done\n");pause;
end
## Texture :
H = 50;
W = 100; # Texture width
w = floor (W/2);
h = floor (H/2);
tr = tg = tb = zeros (H,W+1);
[j,i] = meshgrid (1:W+1,1:H);
tr(find (i<=h & i*W>=j*H )) = 1;
tg(find (i> h & i*W>=(j+w)*H )) = 1;
tb(find (i> h & i*W>=j*H & j> w)) = 1;
if 0
if 1
whiten = find(!(tr | tg | tb));
tr(whiten) = 1;
tg(whiten) = 1;
tb(whiten) = 1;
end
t0 = reshape (255*[tr;tg;tb], H,(W+1)*3);
t0 = t0 + 0.75 * rot90 (t0,2);
t0 = [t0, 0.5*t0];
tex = mat2ims (t0,1);
## ims_show (tex);
texfile = [pwd(),"/mytexfile.ppm"];
ims_save (tex, texfile);
s1 = vrml_faces (x, trg, "tex",texfile,"imsz",[H,W]);
s2 = vrml_faces (x, trg, "tex",texfile);
printf (["Tetrahedrons should appear like (R=red, G=green, B=blue)\n\n",...
" R 2\n",...
" /\n",...
" / G\n",...
" G B /\n",...
" 3--------4 B\n",...
" R B \\\n",...
" \\ R\n",...
" G \\\n",...
" 1\n"]);
vrml_browse ([slight, s1, vrml_transfo(s2,[2,0,0])]);
end
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