--- /dev/null
+## 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/>.
+
+## s = vrml_thick_surf (x, y, z [, options] )
+## s = vrml_thick_surf (z [, options] )
+##
+## Returns vrml97 code for a Shape -> IndexedFaceSet node representing a
+## surface passing through the given points.
+##
+## The surface may look smoother than that returned by vrml_surf, but it
+## has twice as many facets.
+##
+## x : RxC or C : X coordinates of the points on the surface
+## y : RxC or R : Y " "
+## z : RxC : Z " "
+##
+## s : string : The code
+##
+## If x and y are omitted, they are assumed to be 1:C and 1:R, resp
+## Points presenting one or more 'inf' or 'nan' coordinates are ignored.
+##
+## Options :
+##
+## "col" , col : 3 : Color, default = [0.3,0.4,0.9]
+## or 3xP : color of vertices (vrml colorPerVertex is TRUE).
+##
+## "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
+## "smooth" : same as "creaseAngle",pi.
+
+function s = vrml_thick_surf (x, y, z, varargin)
+
+ # Default values
+tran = 0 ;
+col = [0.3, 0.4, 0.9] ;
+smooth = creaseAngle = nan ;
+nargin = nargin();
+
+if (nargin <= 1) || ischar(y), # Cruft to allow not passing x and y
+ zz = x ;
+ [R,C] = size (zz);
+ xx = ones(R,1)*[1:C] ;
+ yy = [1:R]'*ones(1,C) ;
+ if nargin >=3,
+
+ s = vrml_surf ( xx, yy, zz, y, z, varargin{:} );
+ return
+ elseif nargin >=2,
+
+ s = vrml_surf ( xx, yy, zz, y, varargin{:} );
+ return
+ end
+ x = xx ; y = yy ; z = zz ;
+end
+
+ # Read options
+filename = "vrml_thick_surf" ;
+verbose = 0 ;
+
+if nargin > 3,
+
+ opt1 = " tran col creaseAngle " ;
+ opt0 = " smooth " ;
+
+ nargin -= 3 ;
+
+ read_options_old ;
+end
+
+if ! isnan (smooth), creaseAngle = pi ; end
+[R,C] = size(z);
+if any (size (x) == 1), x = ones(R,1)*x(:)' ; end
+if any (size (y) == 1), y = y(:)*ones(1,C) ; end
+
+pts = [x(:)';y(:)';z(:)'];
+
+keepp = all (!isnan(pts) & finite(pts)) ;
+
+trgs = zeros(3,4*(R-1)*(C-1)) ;
+
+tmp = 1:(R-1)*(C-1);
+
+## Points are numbered as
+##
+## 1 R+1 .. (C-1)*R+1
+## 2 R+2 :
+## : : :
+## R 2*R .. C*R
+##
+
+## Triangles are numbered as :
+##
+## X = (R-1)*(C-1)
+## _______________________________
+## | /| /| /| /|-R+1/|
+## | 1 / |R+1/ | / | / |R*C/ |
+## | / | / | / | / | / |
+## | /X+1| /X+R| / | / | / |
+## |/ |/ |/ |/ |/ |
+## -------------------------------
+## | /| /| /| /| /|
+## | 2 / |R+2/ | / | / | / |
+## | / | / | / | / | / |
+## | / | / | / | / | / |
+## |/ |/ |/ |/ |/ |
+## -------------------------------
+## : : :
+## : : :
+## -------------------------------
+## | /| /| /| /| /|
+## | R / |2*R/ | / | / |C*R/ |
+## | / | / | / | / | / |
+## | /X+R| / | / | / | /C*R|
+## |/ |/ |/ |/ |/ X+ |
+## -------------------------------
+
+## (x,y), (x,y+1), (x+1,y) i.e. n, n+1, n+R
+
+trgs(1,tmp) = ([1:R-1]'*ones(1,C-1) + R*ones(R-1,1)*[0:C-2])(:)';
+trgs(2,tmp) = ([ 2:R ]'*ones(1,C-1) + R*ones(R-1,1)*[0:C-2])(:)';
+trgs(3,tmp) = ([1:R-1]'*ones(1,C-1) + R*ones(R-1,1)*[1:C-1])(:)';
+
+## (x+1,y), (x,y+1), (x+1,y+1) i.e. n+R, n+1, n+R+1
+tmp += (R-1)*(C-1);
+
+trgs(1,tmp) = ([1:R-1]'*ones(1,C-1) + R*ones(R-1,1)*[1:C-1])(:)';
+trgs(2,tmp) = ([ 2:R ]'*ones(1,C-1) + R*ones(R-1,1)*[0:C-2])(:)';
+trgs(3,tmp) = ([ 2:R ]'*ones(1,C-1) + R*ones(R-1,1)*[1:C-1])(:)';
+
+## (x,y), (x+1,y+1), (x+1,y) i.e. n, n+1, n+R+1
+tmp += (R-1)*(C-1);
+
+trgs(1,tmp) = ([1:R-1]'*ones(1,C-1) + R*ones(R-1,1)*[0:C-2])(:)';
+trgs(2,tmp) = ([2:R ]'*ones(1,C-1) + R*ones(R-1,1)*[1:C-1])(:)';
+trgs(3,tmp) = ([1:R-1]'*ones(1,C-1) + R*ones(R-1,1)*[1:C-1])(:)';
+
+## (x,y), (x,y+1), (x+1,y+1) i.e. n, n+1, n+R+1
+tmp += (R-1)*(C-1);
+
+trgs(1,tmp) = ([1:R-1]'*ones(1,C-1) + R*ones(R-1,1)*[0:C-2])(:)';
+trgs(2,tmp) = ([ 2:R ]'*ones(1,C-1) + R*ones(R-1,1)*[0:C-2])(:)';
+trgs(3,tmp) = ([ 2:R ]'*ones(1,C-1) + R*ones(R-1,1)*[1:C-1])(:)';
+
+
+if ! all(keepp),
+
+ keept = all (reshape(keepp(trgs),3,4*(R-1)*(C-1)));
+ ## keept = all (keepp(trgs)) ;
+ keepip = find (keepp);
+ keepit = find (keept);
+ renum = cumsum (keepp);
+
+ pts = pts (:,keepip) ;
+ trgs = reshape(renum (trgs (:,keepit)), 3, columns(keepit));
+
+end
+s = vrml_faces (pts, trgs, "col", col, "tran", tran, "creaseAngle", creaseAngle);
+
+## x=-1:0.1:1;y=(x=ones(columns(x),1)*x)';
+## r = sqrt (x.^2+y.^2); c = cos(2*pi*r.^2)./(2+r.^2);
+## Punch some holes
+## holes = ind2sub (size (c), [7,7,9,10,15,16;8,9,10,11,14,14]')
+## c(holes) = nan;
+## vrml_browse ("tmp.wrl",vrml_thick_surf (x, y, c))
+## or save_vrml ("tmp.wrl", vrml_thick_surf (x, y, c))
+endfunction
+
git://git.creatis.insa-lyon.fr / CreaPhase.git / blobdiff