function?stlwrite（filename?varargin）
%STLWRITE???Write?STL?file?from?patch?or?surface?data.
%
%???STLWRITE（FILE?FV）?writes?a?stereolithography?（STL）?file?to?FILE?for?a
%???triangulated?patch?defined?by?FV?（a?structure?with?fields?‘vertices‘
%???and?‘faces‘）.
%
%???STLWRITE（FILE?FACES?VERTICES）?takes?faces?and?vertices?separately
%???rather?than?in?an?FV?struct
%
%???STLWRITE（FILE?X?Y?Z）?creates?an?STL?file?from?surface?data?in?X?Y
%???and?Z.?STLWRITE?triangulates?this?gridded?data?into?a?triangulated
%???surface?using?triangulation?options?specified?below.?X?Y?and?Z?can?be
%???two-dimensional?arrays?with?the?same?size.?If?X?and?Y?are?vectors?with
%???length?equal?to?SIZE（Z2）?and?SIZE（Z1）?respectively?they?are?passed
%???through?MESHGRID?to?create?gridded?data.?If?X?or?Y?are?scalar?values
%???they?are?used?to?specify?the?X?and?Y?spacing?between?grid?points.
%
%???STLWRITE（...‘PropertyName‘VALUE‘PropertyName‘VALUE...）?writes?an
%???STL?file?using?the?following?property?values:
%
%???MODE??????????-?File?is?written?using?‘binary‘?（default）?or?‘a(chǎn)scii‘.
%
%???title?????????-?Header?text?（max?80?chars）?written?to?the?STL?file.
%
%???TRIANGULATION?-?When?used?with?gridded?data?TRIANGULATION?is?either:
%???????????????????????‘delaunay‘??-?（default）?Delaunay?triangulation?of?X?Y
%???????????????????????‘f‘?????????-?Forward?slash?division?of?grid?quads
%???????????????????????‘b‘?????????-?Back?slash?division?of?quadrilaterals
%???????????????????????‘x‘?????????-?Cross?division?of?quadrilaterals
%???????????????????Note?that?‘f‘?‘b‘?or?‘t‘?triangulations?now?use?an
%???????????????????inbuilt?version?of?FEX?entry?28327?“mesh2tri“.
%
%???FACECOLOR?????-?Single?colour?（1-by-3）?or?one-colour-per-face?（N-by-3）?
%???????????????????vector?of?RGB?colours?for?face/vertex?input.?RGB?range
%???????????????????is?5?bits?（0:31）?stored?in?VisCAM/SolidView?format
%???????????????????（http://en.wikipedia.org/wiki/STL_（file_format）#Color_in_binary_STL）
%
%???Example?1:
%???????%?Write?binary?STL?from?face/vertex?data
%???????tmpvol?=?zeros（202020）;???????%?Empty?voxel?volume
%???????tmpvol（8:128:125:15）?=?1;?????%?Turn?some?voxels?on
%???????fv?=?isosurface（tmpvol?0.99）;??%?Create?the?patch?object
%???????stlwrite（‘test.stl‘fv）?????????%?Save?to?binary?.stl
%
%???Example?2:
%???????%?Write?ascii?STL?from?gridded?data
%???????[XY]?=?deal（1:40）;?????????????%?Create?grid?reference
%???????Z?=?peaks（40）;??????????????????%?Create?grid?height
%???????stlwrite（‘test.stl‘XYZ‘mode‘‘a(chǎn)scii‘）

%???Original?idea?adapted?from?surf2stl?by?Bill?McDonald.?Huge?speed
%???improvements?implemented?by?Oliver?Woodford.?Non-Delaunay?triangulation
%???of?quadrilateral?surface?courtesy?of?Kevin?Moerman.?FaceColor
%???implementation?by?Grant?Lohsen.
%
%???Author:?Sven?Holcombe?11-24-11


%?Check?valid?filename?path
path?=?fileparts（filename）;
if?~isempty（path）?&&?~exist（path‘dir‘）
????erro