## Copyright (C) 2016-2019 Markus Muetzel ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 Octave; see the file COPYING. If not, see ## . ## -*- texinfo -*- ## @deftypefn {} {[@var{faces}, @var{vertices}, @var{J}] =} __unite_shared_vertices__ (@var{faces}, @var{vertices}) ## ## Detect and unite shared vertices in patches. ## ## Vertices of neighboring faces are detected and united to shared vertices. ## For this, the mutual squared distances between all vertices are ## calculated. If all coordinates are closer than ## @code{2 * eps (max (abs (vertices(:))))}, the vertices are united to one. ## ## @var{J} holds the indices of the deleted vertices. ## ## @seealso{isosurface, reducepatch} ## @end deftypefn ## Author: mmuetzel function [faces, vertices, J] = __unite_shared_vertices__ (faces, vertices) lut = (1:size (vertices,1))'; J = lut; for di=1:3 [v,i] = sortrows (vertices,1+mod ((0:2)+di,3)); Js = [true; any(abs (diff (v,1,1)) > eps (1.0) * abs (v(2:end,:)+v(1:end-1,:)),2)]; vertices = v(Js,:); J = J(i(Js)); l(i) = cumsum (Js); lut = l(lut); endfor [J,i] = sort (J); j(i) = 1:length (i); vertices = vertices(i,:); faces = j(lut(faces)); faces = faces(all (faces-faces(:,[2 3 1])!=0,2),:); endfunction