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## Copyright (C) 2003-2017 David Legland
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## 1 Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
## 2 Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in the
## documentation and/or other materials provided with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##
## The views and conclusions contained in the software and documentation are
## those of the authors and should not be interpreted as representing official
## policies, either expressed or implied, of the copyright holders.
## Copyright (C) 2004-2011 David Legland <david.legland@grignon.inra.fr>
## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## 1 Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
## 2 Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in the
## documentation and/or other materials provided with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{h} =} drawMesh (@var{vertices}, @var{faces})
## @deftypefnx {Function File} {@var{h} =} drawMesh (@var{mesh})
## @deftypefnx {Function File} {@var{h} =} drawMesh (@dots{}, @var{color})
## @deftypefnx {Function File} {@var{h} =} drawMesh (@dots{}, @var{name},@var{value})
## Draw a 3D mesh defined by vertices and faces
##
## drawMesh(VERTICES, FACES)
## Draws the 3D mesh defined by vertices VERTICES and the faces FACES.
## vertices is a [NVx3] array containing coordinates of vertices, and FACES
## is either a [NFx3] or [NFx4] array containing indices of vertices of
## the triangular or rectangular faces.
## FACES can also be a cell array, in the content of each cell is an array
## of indices to the vertices of the current face. Faces can have different
## number of vertices.
##
## drawMesh(MESH)
## Where mesh is a structure with fields 'vertices' and 'faces', draws the
## given mesh.
##
## drawMesh(..., COLOR)
## Use the specified color to render the mesh faces.
##
## drawMesh(..., NAME, VALUE)
## Use one or several pairs of parameter name/value to specify drawing
## options. Options are the same as the 'patch' function.
##
##
## H = drawMesh(...);
## Also returns a handle to the created patch.
##
## WARNING: This function doesn't work with gnuplot (as of version 4.2)
##
## Example:
## @example
## [v f] = createSoccerBall;
## drawMesh(v, f);
## @end example
##
## @seealso{polyhedra, meshes3d, patch}
## @end deftypefn
function varargout = drawMesh(vertices, faces, varargin)
## Initialisations
# Check if the input is a mesh structure
if isstruct(vertices)
# refresh options
if nargin > 1
varargin = [{faces} varargin];
end
# extract data to display
faces = vertices.faces;
vertices = vertices.vertices;
end
# process input arguments
switch length(varargin)
case 0
# default color is red
varargin = {'facecolor', [1 0 0]};
case 1
# use argument as color for faces
varargin = {'facecolor', varargin{1}};
otherwise
# otherwise keep varargin unchanged
end
# overwrites on current figure
state = ishold(gca);
hold on;
# if vertices are 2D points, add a z=0 coordinate
if size(vertices, 2)==2
vertices(1,3)=0;
end
## Use different processing depending on the type of faces
if isnumeric(faces)
# array FACES is a NC*NV indices array, with NV : number of vertices of
# each face, and NC number of faces
h = patch('vertices', vertices, 'faces', faces, varargin{:});
elseif iscell(faces)
# array FACES is a cell array
h = zeros(length(faces(:)), 1);
for f=1:length(faces(:))
# get vertices of the cell
face = faces{f};
# Special processing in case of multiple polygonal face:
# each polygonal loop is separated by a NaN.
if sum(isnan(face))~=0
# find indices of loops breaks
inds = find(isnan(face));
# replace NaNs by index of first vertex of each polygon
face(inds(2:end)) = face(inds(1:end-1)+1);
face(inds(1)) = face(1);
face(length(face)+1)= face(inds(end)+1);
end
# draw current face
cnodes = vertices(face, :);
h(f) = patch(cnodes(:, 1), cnodes(:, 2), cnodes(:, 3), [1 0 0]);
end
# set up drawing options
set(h, varargin{:});
else
error('second argument must be a face array');
end
if ~state
hold off
end
## Process output arguments
# format output parameters
if nargout>0
varargout{1}=h;
end
endfunction
%!demo
%! [v f] = createCubeOctahedron;
%! drawMesh(v, f);
%! view (3)
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