function?cad2matdemo（filename）
%?CAD2MATDEMO?a?demonstration?of?importing?3D?CAD?data?into?Matlab.
%?To?get?CAD?data?into?Matlab?the?process?is:
%
%?1）?Export?the?3D?CAD?data?as?an?ASCII?STL?（or?Pro/E?render?SLP）?file.
%?2）?This?Matlab?routine?reads?the?CAD?data
%?3）?Once?read?the?CAD?data?is?rotated?around?a?bit.
%
%?Program?has?been?tested?with:?AutoCAD?Cadkey?and?Pro/Engineer.
%?Should?work?with?most?any?CAD?programs?that?can?export?STL.
%?
%?Format?Details:??STL?is?supported?and?the?color?version?of?STL
%?that?Pro/E?exports?called?‘render.‘??The?render?（SLP）?is?just?
%?like?STL?but?with?color?added.
%?
%?Note:?This?routine?has?both?the?import?function?and?some?basic
%?manipulation?for?testing.??The?actual?reading?mechanism?is?located
%?at?the?end?of?this?file.
??
if?nargin?==?0????
???filename?=?‘hook.stl‘;?%?a?simple?demo?part
???warning（[‘No?file?specified?using?demo?file:?‘?filename]）;
end
%
%?Read?the?CAD?data?file:
[F?V?C]?=?rndread（filename）;
clf;
??p?=?patch（‘faces‘?F?‘vertices‘?V）;
????%set（p?‘facec‘?‘b‘）;??????????????%?Set?the?face?color?（force?it）
????set（p?‘facec‘?‘flat‘）;????????????%?Set?the?face?color?flat
????set（p?‘FaceVertexCData‘?C）;???????%?Set?the?color?（from?file）
????%set（p?‘facealpha‘.4）?????????????%?Use?for?transparency
????set（p?‘EdgeColor‘‘none‘）;?????????%?Set?the?edge?color
????%set（p?‘EdgeColor‘[1?0?0?]）;??????%?Use?to?see?triangles?if?needed.
????light???????????????????????????????%?add?a?default?light
????daspect（[1?1?1]）????????????????????%?Setting?the?aspect?ratio
????view（3）?????????????????????????????%?Isometric?view
????xlabel（‘X‘）ylabel（‘Y‘）zlabel（‘Z‘）
????title（[‘Imported?CAD?data?from?‘?filename]）
????drawnow?????????????????????????????%?axis?manual
????%
????disp（[‘CAD?file?‘?filename?‘?data?is?read?will?now?show?object?rotating‘]）
????pause（1）?
????%
????%?Move?it?around.
????%?To?use?homogenous?transforms?the?n?by?3?Vertices?will?be?turned?to?
????%?n?by?4?vertices?then?back?to?3?for?the?set?command.
????%?Note:?n?by?4?needed?for?translations?not?used?here?but?could?using?tl（xyz）
????V?=?V‘;
????V?=?[V（1:）;?V（2:）;?V（3:）;?ones（1length（V））];
????%
????vsize?=?maxv（V）;?%attempt?to?determine?the?maximum?xyz?vertex.?
????AXIS（[-vsize?vsize?-vsize?vsize?-vsize?vsize]）;
????%
for?ang?=?0:1:90
????nv?=?rx（ang）*V;
????set（p‘Vertices‘nv（1:3:）‘）???????
????drawnow
end
for?ang1?=?0:2:90
????nv1?=?ry（ang1）*nv;
????set（p‘Vertices‘nv1（1:3:）‘）?????
????drawnow
end
for?ang2?=?0:3:90
????nv2=?rz（ang2）*nv1;
????set（p‘Vertices‘nv2（1:3:）‘）??????
????drawnow
end
for?ang3?=?0:5:180
????nv3?=?rx（ang3）*ry（ang3）*rz（ang3）*nv2;
????set（p‘Vertices‘nv3（1:3:）‘）??????
????drawnow
end
%
%?End?of?main?routine?here?are?the?functions?used:
%?Homogeneous?manipulation?functions?follow:
%
function?Rx?=?rx（THETA）
%?ROTATION?ABOUT?THE?X-AXIS
%
%?Rx?=?rx（THETA）
%
%?This?is?the?homogeneous?transformatio

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件???????4243??2004-03-10?21:19??surf2stl.m

-----------?---------??----------?-----??----

?????????????????4243????????????????????1