📄 the ply file format.mht
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Subject: The PLY File Format
Date: Thu, 24 Mar 2005 22:31:54 +0800
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<CENTER>The PLY File =
Format</CENTER></FONT></TD></TR></TBODY></TABLE>
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<H1>The PLY File Format</H1></FONT></TD>
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<CENTER><A=20
=
href=3D"http://www.cc.gatech.edu/projects/large_models/files/ply.tar.gz">=
<B><FONT=20
color=3D#7719a8 size=3D3>Download PLY Tools <FONT =
color=3D#ffffff=20
size=3D1>(41KB)</FONT></FONT></B></A> </CENTER></TD>
<TD =
width=3D10></TD></TR></TBODY></TABLE> The PLY=20
file format is a simple object description that was designed as a=20
convenient format for researchers who work with polygonal models. =
Early=20
versions of this file format were used at Stanford University and =
at UNC=20
Chapel Hill.=20
<P> A PLY file consists of a header =
followed by a=20
list of vertices and then a list of polygons. The header specifies =
how=20
many vertices and polygons are in the file, and also states what=20
properties are associated with each vertex, such as (x,y,z) =
coordinates,=20
normals and color. The polygon faces are simply lists of indices =
into the=20
vertex list, and each face begins with a count of the number of =
elements=20
in each list.=20
<P> Source code for programs that read and =
write=20
PLY files can be found in the <A=20
=
href=3D"http://www.cc.gatech.edu/projects/large_models/files/ply.tar.gz">=
PLY=20
code archive.</A> This archive includes programs to transform =
polygonal=20
objects, calculate surface normals, flip faces and determine the =
spatial=20
bounds of an object. We plan to make additional tools available in =
the=20
near future. =
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