www.gusucode.com > matlab 案例源码 matlab代码程序 > matlab/BoundaryOf3DAlphaShapeExample.m
%% Find Boundary of 3-D Alpha Shape % Create a set of 3-D points. % Copyright 2015 The MathWorks, Inc. [x1, y1, z1] = sphere(24); x1 = x1(:); y1 = y1(:); z1 = z1(:); x2 = x1+5; P = [x1 y1 z1; x2 y1 z1]; P = unique(P,'rows'); %% % Create and plot an alpha shape using an alpha radius of 1.5. shp = alphaShape(P,1.5); plot(shp) axis equal %% % Compute and plot only the boundary of the alpha shape. [tri, xyz] = boundaryFacets(shp); trisurf(tri,xyz(:,1),xyz(:,2),xyz(:,3),... 'FaceColor','cyan','FaceAlpha',0.3) axis equal