--- /dev/null
+## Copyright (C) 2002-2012 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/>.
+
+## s = vrml_faces(x,f,...) - VRML facet object (IndexedFaceSet node)
+##
+## x : 3xP : The 3D points
+## f : 3xQ : The indexes of the points forming the faces. Indexes
+## should have values in 1:P.
+##
+## Returns a Shape -> IndexedFaceSet vrml node.
+##
+## No check is done on anything
+##
+## Options :
+##
+## "col" , col : 3 : Color, default = [0.3,0.4,0.9]
+## or 3xP : Color of vertices
+## or 3xQ : Color of facets (use "colorPerVertex" below to
+## disambiguate the case P==Q).
+##
+## "emit", em : 3 : Emissive color of the surface
+## : 3XP : (same as color)
+## : 3xQ :
+## : 1 : Use color as emissive color too default = 0
+##
+## "tran", tran : 1x1 : Transparency, default = 0
+##
+## "creaseAngle", a
+## : 1 : vrml creaseAngle value. The browser may smoothe the
+## crease between facets whose angle is less than a.
+## default = 0
+## "tex", texfile
+## : string : Name of file containing texture. default : none
+##
+## "imsz", sz : 2 : Size of texture image
+## default is determined by imginfo()
+##
+## "tcoord", tcoord
+## : 2x3Q : Coordinates of vertices in texture image. Each 2x3
+## block contains coords of one facet's corners. The
+## coordinates should be in [0,1], as in a VRML
+## TextureCoordinate node.
+## default assumes faces are returned
+## by extex()
+##
+## "smooth" : same as "creaseAngle",pi.
+## "convex"
+## "colorPerVertex", c: If 1, col specifies color of vertices. If 0,
+## col specifies color of facets. Default = 1
+##
+## "DEFcoord",n : string : DEF the coord VRML node with name n. Default = ''
+## "DEFcol", n : string : DEF the color VRML node with name n. Default = ''
+##
+## See also: vrml_surf(), vmesh(), test_vrml_faces()
+
+function s = vrml_faces (x,f,varargin)
+
+ ## mytic; starttime = cputime();
+
+ if rows (x) != 3
+ if columns (x) != 3
+ error ("x is %i x %i, has neither 3 rows nor 3 columns.", size (x));
+ else
+ x = x';
+ end
+ end
+
+ tran = 0 ;
+ col = [0.3, 0.4, 0.9] ;
+ convex = emit = 0;
+ tcoord = imsz = tex = smooth = creaseAngle = nan ;
+ colorPerVertex = nan;
+ DEFcol = DEFcoord = "";
+
+ ## Read options ######################################################
+ opt1 = " tex DEFcoord DEFcol imsz tcoord tran col creaseAngle colorPerVertex emit " ;
+ opt0 = " smooth convex " ;
+
+ verbose = 0 ;
+
+ i = 1;
+
+ while numel(varargin)>=i
+
+ tmp = varargin{i++};
+ if ! ischar(tmp) ,
+ error ("vrml_faces : Non-string option : \n") ;
+ ## keyboard
+ end
+
+ if index(opt1,[" ",tmp," "]) ,
+
+ tmp2 = varargin{i++} ;
+
+ eval([tmp,"=tmp2;"]) ;
+
+ if verbose , printf ("vrml_faces : Read option : %s.\n",tmp); end
+
+ elseif index(opt0,[" ",tmp," "]) ,
+
+ eval([tmp,"=1;"]) ;
+ if verbose , printf ("vrml_faces : Read boolean option : %s\n",tmp); end
+
+ else
+ error ("vrml_faces : Unknown option : %s\n",tmp) ;
+ ## keyboard
+ end
+ endwhile
+ ## printf (" Options : %f\n",mytic()); ## Just for measuring time
+ ## End of reading options ############################################
+
+ if !isempty (DEFcol), col_def_str = ["DEF ",DEFcol];
+ else col_def_str = "";
+ end
+
+
+ if ! isnan (smooth), creaseAngle = pi ; end
+
+ ## printf ("creaseAngle = %8.3f\n",creaseAngle);
+
+ nfaces = columns (f);
+ if ismatrix(f)
+ if rows (f) < 3
+ error ("Faces matrix 'f' has %i < 3 rows, so it does not define faces",
+ rows (f));
+ end
+ if any (f > columns (x))
+ error ("Faces matrix 'f' has value %i greater than number of points %i",
+ max (f(:)), columns (x));
+ end
+ end
+
+ if ! isnan (tcoord)
+
+ col_str_1 = sprintf ([" appearance Appearance {\n",...
+ " texture ImageTexture {\n",...
+ " url \"%s\"\n",...
+ " }\n",...
+ " }\n"],...
+ tex);
+
+ texcoord_point_str = sprintf (" %8.5f %8.5f\n", tcoord);
+
+ col_str_2 = sprintf ([" texCoord TextureCoordinate {\n",\
+ " point [\n %s]\n",\
+ " }\n"\
+ ],\
+ texcoord_point_str\
+ );
+
+ # If texture has been provided
+ elseif ischar (tex), # Assume triangles
+
+ ## printf ("Using texture\n");
+
+ col_str_1 = sprintf ([" appearance Appearance {\n",...
+ " texture ImageTexture {\n",...
+ " url \"%s\"\n",...
+ " }\n",...
+ " }\n"],...
+ tex);
+
+ # Eventually determine size of image
+ if isnan(imsz), imsz = imginfo (tex); end
+
+ if isnan (tcoord),
+
+ nb = ceil (nfaces/2); # n of blocks
+ lo = [0:nb-1]/nb; hi = [1:nb]/nb;
+ on = ones (1,nb); ze = zeros (1,nb);
+
+ sm = (1/nb) /(imsz(2)+1);
+ tcoord = [lo; on; lo; ze; hi-sm; ze; lo+sm; on; hi-sm; on; hi-sm; ze];
+ tcoord = reshape (tcoord, 2, 6*nb);
+ tcoord = tcoord (:,1:3*nfaces);
+ end
+
+ col_str_2 = sprintf ([" texCoord TextureCoordinate {\n",\
+ " point [\n %s]\n",\
+ " }\n",\
+ " texCoordIndex [\n %s]\n",\
+ " coordIndex [\n %s]\n",\
+ ],\
+ sprintf ("%10.8f %10.8f,\n ",tcoord),\
+ sprintf ("%-4d, %-4d, %-4d, -1,\n ",0:3*nfaces-1),\
+ sprintf ("%-4d, %-4d, %-4d, -1,\n ",f-1)
+ );
+
+ ## TODO : f-1 abobe seems to not work if f is a cell or list (check
+ ## whether this is possible here)
+
+ elseif prod (size (col))==3, # One color has been specified for the whole
+ # surface
+
+ col_str_1 = [" appearance Appearance {\n",...
+ vrml_material(col, emit, tran,DEFcol),\
+ " }\n"];
+
+ col_str_2 = "";
+ else
+ if (emit) # Color is emissive by default
+ col_str_1 = "";
+
+
+ else # If there's a material node, it is not
+ # emissive.
+ if tran, ts = sprintf ("transparency %8.3f",tran);
+ else ts = "";
+ end
+ col_str_1 = ["appearance Appearance {\n",\
+ " material Material {",ts,"}\n}\n"];
+ end
+ if isnan (colorPerVertex)
+ if prod (size (col)) == 3*columns (x), colorPerVertex = 1;
+ elseif prod (size (col)) == 3*columns (f), colorPerVertex = 0;
+ end
+ end
+ if colorPerVertex, cPVs = "TRUE"; else cPVs = "FALSE"; end
+
+ col_str_2 = sprintf ([" colorPerVertex %s\n",\
+ " color %s Color {\n",\
+ " color [\n%s\n",\
+ " ]\n",\
+ " }"],\
+ cPVs,\
+ col_def_str,\
+ sprintf(" %8.3f %8.3f %8.3f,\n",col));
+ end
+
+ ## printf (" Colors : %f\n",mytic()); ## Just for measuring time
+
+ etc_str = "" ;
+ if ! isnan (creaseAngle),
+ etc_str = [etc_str, sprintf(" creaseAngle %8.3f\n",creaseAngle)];
+ end
+
+ ## TODO : s/list/cell/g; Should put this code in sometime soon
+ ## Code below seems useless
+ # Faces
+ if iscell (f), nfaces = length (f); else nfaces = columns (f); end
+
+
+ tpl0 = sprintf ("%%%dd, ",floor (log10 (max (1, columns (x))))+1);
+ ltpl0 = length (tpl0);
+
+ ptsface = zeros (1,nfaces);
+
+ # Determine total number of vertices, number
+ # of vertices per face and indexes of
+ # vertices of each face
+ if iscell (f)
+ npts = 0;
+ for i = 1:length (f),
+ ptsface(i) = 1+length (f{i});
+ npts += ptsface(i);
+ end
+ ii = [0, cumsum(ptsface)]';
+ all_indexes = -ones (1,npts);
+ for i = 1:length (f), all_indexes(ii(i)+1:ii(i+1)-1) = f{i} - 1; end
+ else
+ f = [f;-ones(1,columns(f))];
+ npts = sum (ptsface = (sum (!! f)));
+ all_indexes = nze (f) - 1;
+ all_indexes(find (all_indexes<0)) = -1;
+ end
+ ## printf (" Indexes : %f\n",mytic()); ## Just for measuring time
+
+ coord_str = sprintf (tpl0, all_indexes);
+ ## That's too slow coord_str = strrep (coord_str, "-1, ","-1,\n");
+
+ ## printf (" Faces : %f\n",mytic()); ## Just for measuring time
+
+ if ! convex, etc_str = [etc_str," convex FALSE\n"]; end
+
+ if !isempty (DEFcoord), coord_def_str = ["DEF ",DEFcoord];
+ else coord_def_str = "";
+ end
+
+ s = sprintf([... # string of indexed face set
+ "Shape {\n",...
+ col_str_1,...
+ " geometry IndexedFaceSet {\n",...
+ " solid FALSE # Show back of faces too\n",...
+ col_str_2,...
+ etc_str,...
+ " coordIndex [\n%s]\n",...
+ " coord %s Coordinate {\n",...
+ " point [\n%s]\n",...
+ " }\n",...
+ " }\n",...
+ "}\n",...
+ ],...
+ coord_str,...
+ coord_def_str,...
+ sprintf(" %8.3f %8.3f %8.3f,\n",x)) ;
+ ## printf (" Assembly : %f\n",mytic()); ## Just for measuring time
+ ## printf ("Total Time : %f\n",cputime() - starttime);
+
+%!demo
+%! % Test the vrml_faces and vrml_browse functions with the test_vrml_faces script
+%! test_vrml_faces
+endfunction
+
git://git.creatis.insa-lyon.fr / CreaPhase.git / blobdiff