Code covered by the BSD License

# geom3d

### David Legland (view profile)

19 Jun 2009 (Updated )

Library to handle 3D geometric primitives: create, intersect, display, and make basic computations

### Editor's Notes:

This file was selected as MATLAB Central Pick of the Week

clipMeshVertices(vertices, faces, box)
```function [cVertices, cFaces] = clipMeshVertices(vertices, faces, box)
%CLIPMESHVERTICES Clip vertices of a surfacic mesh and remove outer faces
%
%   output = clipMeshVertices(input)
%
%   Example
%   clipMeshVertices
%
%

% ------
% Author: David Legland
% e-mail: david.legland@grignon.inra.fr
% Created: 2011-04-07,    using Matlab 7.9.0.529 (R2009b)
% Copyright 2011 INRA - Cepia Software Platform.

if isstruct(vertices)
box = faces;
faces = vertices.faces;
vertices = vertices.vertices;
end

[cVertices, indVertices] = clipPoints3d(vertices, box);

% for face indices relabeling
refInds = zeros(size(indVertices));
for i = 1:length(indVertices)
refInds(indVertices(i)) = i;
end

if isnumeric(faces)
% Faces given as numeric array
indFaces = sum(~ismember(faces, indVertices), 2) == 0;
cFaces = refInds(faces(indFaces, :));

elseif iscell(faces)
% Faces given as cell array
nFaces = length(faces);
indFaces = false(nFaces, 1);
for i = 1:nFaces
indFaces(i) = sum(~ismember(faces{i}, indVertices), 2) == 0;
end
cFaces = faces(indFaces, :);

% re-label indices of face vertices
for i = 1:length(cFaces)
cFaces{i} = refInds(cFaces{i});
end

end
```