function?build_ply（outfilexyzrgb）
%outfile?is?the?binary?ply‘filename?which?you?want?to?make;
%xyz?is?the?N*3?matrix?for?point?cloud‘s?coordinate?data;
%rgb?is?the?color?for?every?point?respectively.
if（size（xyz1）~=size（rgb1））
????error（‘Input?xyz?and?rgb?arguments?should?have?same?number?of?rows‘）;
end
if（size（xyz2）~=3?|?size（rgb2）~=3）
????error（‘Input?xyz?aand?rgb?arguments?should?have?3?columns‘）;
end


pt3d（:1）?=?xyz（:1）;
pt3d（:2）?=?xyz（:2）;
pt3d（:3）?=?xyz（:3）;
pt3d=pt3d‘;
RGB（:1）?=?uint8（rgb（:1））;
RGB（:2）?=?uint8（rgb（:2））;
RGB（:3）?=?uint8（rgb（:3））;
RGB=RGB‘;
dataChunk?=?[reshape（typecast（reshape（single（pt3d）1[]）‘uint8‘）3*4[]）;?RGB];
size（dataChunk2）
file?=?writePLYhead（outfile?size（dataChunk2））;
fwrite（file?dataChunk‘u