stl为什么文件

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<H2 align=center><A name=SOFTWARE>Software for Rapid
Prototyping</A></H2>
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<H3>
<MENU><IMG border=0 height=13 src="stl_files/RED.gif" width=13><A
 href="http://ecoleing.uqtr.uquebec.ca/geniedoc/gmm/productique/rp_softw.htm#FILE_FORMAT">The
 File Format</A>
 
 <OL>
 <LI><A
 href="http://ecoleing.uqtr.uquebec.ca/geniedoc/gmm/productique/rp_softw.htm#STL">STL</A> <LI><A href="http://www.cranfield.ac.uk/aero/rapid/CLI/cli_v20.html">CLI:
 Common Layer Interface, Version 2.0</A>
 <LI><A
 href="http://cat.rpi.edu/~rocks/PUBS/SFF91-FlexFormat-Abstract.html">RPI</A>:
 (<A
 href="http://cadserv.cadlab.vt.edu/bohn/rp/SRock/SFF91-FlexFormat.pdf">Acrobat
 .pdf: 112 Kb</A>) (<A
 href="http://cadserv.cadlab.vt.edu/bohn/rp/SRock/SFF91-FlexFormat.ps">Macintosh
 PostScript: 1.2 Mb</A>)
 <LI><A
 href="http://ecoleing.uqtr.uquebec.ca/geniedoc/gmm/productique/rp_softw.htm#SLC">SLC:
 layer contours (FDM version)</A> by <A
 href="http://cadserv.cadlab.vt.edu/bohn/RP.html">Jan Holge Bohn</A>
 <LI>SLI
 <LI>BIN </LI></OL>
 <IMG border=0 height=13 src="stl_files/RED.gif" width=13><A
 href="http://ecoleing.uqtr.uquebec.ca/geniedoc/gmm/productique/rp_softw.htm#COM_SOFTWARE">The
 Commercial RP Software</A>
 <IMG border=0 height=13 src="stl_files/RED.gif" width=13><A
 href="http://ecoleing.uqtr.uquebec.ca/geniedoc/gmm/productique/rp_softw.htm#SHAREWARE">The
 RP Shareware</A>
 <IMG border=0 height=13 src="stl_files/RED.gif" width=13><A
 href="http://ecoleing.uqtr.uquebec.ca/geniedoc/gmm/productique/rp_softw.htm#CADWARE">The
 CAD Software with .STL Interface</A>
 </MENU></H3>
 
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<H3 align=center><A name=FILE_FORMAT>The File Format</A></H3>


<H4><A name=STL></A>1. The .STL File Format</H4>

The .STL (stereolithography) file is the de-facto standard CAD representation
for RP. It was established by <A href="http://www.3dsystems.com/">3D Systems
</A></TD>in the late 80s. The .STL format of a CAD model is a faceted surface
representation,i.e. a list of the triangular surfaces with no adjacency
information. This is the standard input for most RP systems. There are two
format for .STL files: binary and ASCII which differs as follow:
<UL>
 <LI>Binary .STL file
 The binary .STL files format consists of an 80 bytes header used to
 describe the solid contained within the file, then 4 bytes represent the total
 number of facets in the  file. A facet is described as follow: the first
 12 bytes (3 x 4 bytes) represent its normal, the next 36 bytes (3 x 3 x 4
 bytes) represent its (three) vertices, then two unused bytes are padded to
 achieve a block size of 50 bytes.
 <LI>ASCII .STL files
 ASCII files use keywords and are self explanatory. The ASCII .stl file must
 start with the lower case keyword solid and end with endsolid.
 Within these keywords are listings of individual triangles that define the
 faces of the solid model. Each individual triangle description defines a
 single normal vector directed away from the solid's surface followed by the
 xyz components for all three of the vertices. These values are all in
 Cartesian coordinates and are floating point values. The triangle values
 should all be positive and contained within the building volume. The normal
 vector is a unit vector of length one based at the origin. If the normals are
 not included then most software will generate them using the right hand rule.
 If the normal information is not included then the three values should be set
 to 0.0. There is a variety of errors in ASCII files that do not appear in
 binary files. For instance, it happens that keywords are either skipped of
 extraneous, hindering the extraction of data. Here's an example of an .STL
 ASCII file:
 <BLOCKQUOTE><PRE>solid Solidname
facet normal 9.838605e-01 3.226734e-02 1.760037e-01
  outer loop
    vertex   -1.070000e+02 0.000000e+00 1.816000e+02
    vertex   -1.060000e+02 0.000000e+00 1.760100e+02
    vertex   -1.070000e+02 1.200000e+00 1.813800e+02
  endloop
endfacet
facet normal 9.824255e-01 9.205564e-02 1.623759e-01
  outer loop
  vertex   -1.070000e+02 1.200000e+00 1.813800e+02
    vertex   -1.060000e+02 0.000000e+00 1.760100e+02
    [...]
 endloop
endfacet
[...]
endsolid
 
 </PRE></BLOCKQUOTE></LI></UL>
 
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<HR> 
<H4><A name=SLC>4. The .SLC file format</A></H4>.SLC files are used in the fused
deposition modeling (FDM) process from<A
href="http://www.stratasys.com/">Stratasys, Inc.</A> They describe the contours
on, and the thickness of, each build layer.

<UL>
 <LI>The .SLC file format is an ASCII text file format.
 <LI>Comments may be included. The begin with a "#" and end at the end of that
 line.
 <LI>Units are in inches. </LI></UL>In the case of the FDM 1600 rapid prototyping
system:
<UL>
 <LI>x,y,z should be positive floats in the range from 0 to 9 inches.
 <LI>Layer thicknesses (dz) range from 0.005 to 0.015 inches. The
 standard layer thickness is 0.010 inches. </LI></UL>
Example:
The bold characters should be typed as is. The italic characters should be
substituted with their corresponding values. <PRE>Slice V0 # 0 = zero
FILE(filename) # filename may include full path
SLICES() #
Z z dz # z = absolute z of layer, dz = layer thickness
x y # Provide the coordinates of the corner points
x y # along each contour. Do not duplicate the
x y # first point. The is no upper limit on the
x y # number of points in a contour.
x y #
C # Terminate the contour with a "C".
x y # Begin the second contour on this level...
x y #
x y #
x y #
x y #
C # Terminate the second contour.
Z z dz # Begin a new layer (z = z.old + dz)
x y # Begin a new contour on a new level...
x y #
x y #
x y #
x y #
C # Terminate the contour.
END # All following lines are ignored.
</PRE>
 
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<HR> 
<H3 align=center><A name=COM_SOFTWARE>The Commercial Software</A></H3>

<UL>
 <LI><A href="http://www.materialise.com/">Materialise</A> offers professional
 RP software: Magics, ContourTools,CT-Modeller System, RPWWW.and free download
 evaluation version ( passwords required) 
 <LI><A href="http://design.vr.clemson.edu/ivecs/ivecs.html">IVECS</A> -
 software developed at Clemson University for repairing and verifiing of STL
 files. 
 <LI><A href="http://www.actify.com/3DView/3DView.html">3D View</A> Actify,
 Inc. - a 3D CAD/CAM viewer for windows NT/95 that supports STL,IGES, VDA-FS,
 ISO G-Code and VRML. 
 <LI><A href="http://www.iware.com/">Imageware </A>produces software: RPM7.0
 for Rapid Prototyping and Rapid Tooling. 
 <LI><A href="http://www.primenet.com/~nest/">NEST Technologies</A> of Studio
 City, California sells DeskArtes - editor, slicer, support generator software
 for the RP et. 
 <LI><A href="http://www.geomagic.com/">Raindrop Geomagic, Inc.</A> is a
 software company dedicated to providing Automatic Surface Reconstruction
 software.
 <LI><A href="http://www.cimatron.co.il/">Cimagrafi Engraving Software</A> is a
 software for industrial and artistic engraving from Picture-to-Part, with STL
 interface.
 <LI><A href="http://www.interaccess.ch/pview/pview.htm">InterAccess Polygon
 View</A> allows you to visualize and manipulate complex 3D polygonal data
 (e.g. CAD models or 3D reconstructions of medical data) in real-time on
 Silicon Graphics workstations.
 <LI><A href="http://kasumi.castech.fi/CastCAE/index.html">CastCAE</A> Casting
 process simulation software with STL interface </LI></UL>

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<HR> 
<H3 align=center><A name=SHAREWARE>The Shareware</A></H3>
<UL>
 <LI><A href="http://ourworld.compuserve.com/homepages/igort/INDEX.HTM">StlView
 7.0 </A>
 <LI><A href="http://www.infoline.ru/g23/9749/soft/soft.html">STLPACK.EXE -
 compressor for STL files </A></LI></UL>

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<HR> 
<H3 align=center><A name=CADWARE>The CAD Software with .STL Interface</A></H3>
<UL>
 <LI><A href="http://www.proe.com/">Pro/Engineer (PTC)</A>
 <LI><A href="http://www.autodesk.com/">AutoCAD (Autodesk)</A>
 <LI><A href="http://www.sdrc.com/">I-DEAS (SDRC)</A>
 <LI><A href="http://www.icem.com/">ICEM (Control Data Systems, Inc.)</A>
 <LI><A href="http://www.cv.com/">CADDS (Computervison)</A>Merged into PTC!
 <LI><A href="http://www.cadkey.com/">CADkey</A>
 <LI><A href="http://www.bentley.com/">MicroStation</A> </LI></UL>


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