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function polygons3d(varargin)
%POLYGONS3D Description of functions operating on 3D polygons.
%
%   A 3D polygon is simply a set of 3D points (called vertices) which are
%   assumed to be located in the same plane.
%   Several functions are provided for computing basic geometrical
%   parameters (centroid, angles), or intersections with lines or planes.
%
%   See also:
%   polygonArea3d, triangleArea3d, polygonCentroid3d, polygon3dNormalAngle 
%   intersectLinePolygon3d, intersectLineTriangle3d, intersectRayPolygon3d
%   clipConvexPolygon3dHP
%   drawPolygon3d, drawPolyline3d, fillPolygon3d
%
% ------
% Author: David Legland
% e-mail: david.legland@grignon.inra.fr
% Created: 2008-10-13,    using Matlab 7.4.0.287 (R2007a)
% Copyright 2008 INRA - BIA PV Nantes - MIAJ Jouy-en-Josas.