mkcube2.m

来自澳大利亚Qeensland大学的计算机视觉Matlab工具箱。 This Toolbox provides a number of functions that are useful in co

%MKCUBE		Create vertices of a cube
%
%	xyz = MKCUBE
%	xyz = MKCUBE(s)
%	xyz = MKCUBE(s, c)
%
%	[x,y,z] = MKCUBE
%	[x,y,z] = MKCUBE(s)
%	[x,y,z] = MKCUBE(s, c)
%
%	Return a 3-column matrix where each row contains the (x,y,z) coordinates
%	of a cubes vertices.  The side length S defaults to 1.  The centre
%	C = (x,y,z) defaults to (0,0,0).
%
%	Alternatively the function can be called with 3 output arguments
%	which are vectors of X, Y an Z coordinates.
%
%	Copyright (c) Peter Corke, 1999  Machine Vision Toolbox for Matlab


function xyz = mkcube2(s, c)
	if nargin == 0,
		s = 1;
		c = [0 0 0];
	elseif nargin == 1,
		c = [0 0 0];
	end

	% cube has 12 edges
	cube = [
		0 0 0 1 0 0
		0 0 0 0 1 0
		0 0 0 0 0 1

		1 1 1 0 1 1
		1 1 1 1 0 1
		1 1 1 1 1 0

		0 0 1 0 1 1
		0 0 1 1 0 1

		1 0 0 1 0 1
		1 0 0 1 1 0

		0 1 0 0 1 1
		0 1 0 1 1 0
	];

	cube = cube * s;
	cube = cube - ones(length(cube),1) * [c+s/2 c+s/2];
 
	xyz = cube;