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## Copyright (C) 2024 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.
function varargout = clipPoints3d(points, shape, varargin)
%CLIPPOINTS3D Clip a set of points by a box or other 3d shapes.
%
% CLIP = clipPoints3d(POINTS, BOX);
% Returns the set of points which are located inside of the box BOX.
%
% [CLIP, IND] = clipPoints3d(POINTS, BOX);
% Also returns the indices of clipped points.
%
% ... = clipPoints3d(..., 'shape', 'sphere') Specify the shape.
% Default is 'box'. But it is also possible to use 'sphere' or 'plane'.
%
% ... = clipPoints3d(..., 'inside', false) returns the set of
% points outside the shape instead of inside.
%
% See also
% points3d, boxes3d, spheres
%
% ------
% Author: David Legland, oqilipo
% E-mail: david.legland@inrae.fr
% Created: 2008-10-13, using Matlab 7.4.0.287 (R2007a)
% Copyright 2008-2023 INRA - BIA Nantes - MIAJ Jouy-en-Josas
parser = inputParser;
validStrings = {'box', 'sphere', 'plane'};
addParameter(parser, 'shape', 'box', @(x) any(validatestring(x, validStrings)));
addParameter(parser, 'inside', true, @islogical);
parse(parser,varargin{:});
switch parser.Results.shape
case 'box'
LI = clipPointsByBox(points, shape);
case 'plane'
LI = clipPointsByPlane(points, shape);
case 'sphere'
LI = clipPointsBySphere(points, shape);
end
if parser.Results.inside
% keep points inside the shape
ind = find(LI);
else
% keep points outside the shape
ind = find(~LI);
end
points = points(ind, :);
% process output arguments
varargout{1} = points;
if nargout == 2
varargout{2} = ind;
end
function LI = clipPointsByBox(points, box)
% get bounding box limits
xmin = box(1);
xmax = box(2);
ymin = box(3);
ymax = box(4);
zmin = box(5);
zmax = box(6);
% compute indices of points inside visible area
xOk = points(:,1) >= xmin & points(:,1) <= xmax;
yOk = points(:,2) >= ymin & points(:,2) <= ymax;
zOk = points(:,3) >= zmin & points(:,3) <= zmax;
LI = xOk & yOk & zOk;
end
function LI = clipPointsByPlane(points, plane)
% points inside and on the surface of the sphere
LI = isBelowPlane(points, plane);
end
function LI = clipPointsBySphere(points, sphere)
% points inside and on the surface of the sphere
LI = distancePoints3d(points, sphere(1:3)) <= sphere(4);
end
end
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