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/** \page history Version history

\htmlonly

<table border=1 cellpadding=4 cellspacing=2>

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<tr valign=top><td><b>2.0-RC6</b> (?/?/?,Rev.318)</td><td>
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<b>Core</b>
<ul>
<li>Improve computation of normals for poly meshes ( now the average normal is taken not the normal of one triangle)</li>
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<li>Added status flag indicating that mesh reader duplicated primitives to avoid non-manifold configurations</li>
</ul>

<b>Tools</b>
<ul>
<li>OpenMesh mesh dual generator added (Thanks to Clement Courbet for providing the code)</li>
</ul>

<b>Apps</b>
<ul>
<li>OpenMesh mesh dual generator application added (Thanks to Clement Courbet for providing the code)</li>
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</ul>
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<b>Documentation</b>
<ul>
<li>Added search engine</li>
<li>Added reeview on the left</li>
<li>Generate subpage structure to make treeview more organized</li>
</ul>

<b>Build System</b>
<ul>
<li>Updated glew and glut finders</li>
</ul>

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</tr>

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<tr valign=top><td><b>2.0-RC5</b> (2010/03/08,Rev.305)</td><td>
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<b>Core</b>
<ul>
<li>Fixed build error in function calc_dihedral_angle_fast</li>
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<li>Made iterators/circulators stl compliant</li>
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<li>Provide begin/end functions for circulators</li>
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<li>mostream crash fixed (Thanks to Adrian Secord for providing the patch)</li>
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<li>added colors to status flags for edges ( request_edge_color ... )</li>
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<li>Fixed issue with wrong normal scalar type when using integer points and float normals ( Thanks to Clement Courbet for reporting this bug)</li>
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</ul>

<b>Readers/Writers</b>
<ul>
<li>Fixed build error in STL writer</li>
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<li>Fixed and enhanced PLY reader to improve handling of unknown properties (Thanks to Michal Nociar for the patch)</li>
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<li>Fixed crash in Offreader with DOS line endings. (Thanks to Adrian Secord for the patch)</li>
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<li>Fixed obj readers for some files containing tabs</li>
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</ul>

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<b>Apps</b>
<ul>
<li>OpenMesh progressive mesh generator readded</li>
<li>OpenMesh progressive mesh viewer readded</li>
<li>OpenMesh progressive mesh analyzer readded</li>
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<li>OpenMesh progressive mesh synthesizer readded</li>
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</ul>

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<b>Documentation</b>
<ul>
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<li>Updated Documentation front page</li>
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<li>Added mesh navigation tutorial</li>
<li>Added iterator tutorial</li>
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<li>Updated tutorial and docu for mesh circulators</li>
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<li>Updated tutorial on deleting geometry</li>
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<li>Examples for flipping and collapsing edges</li>
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<li>Fixed a lot of doxygen warnings</li>
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<li>Fixed some spellings</li>
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</ul>

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<b>Build System</b>
<ul>
<li>Fixed rpath issue when building and installing on MacOS</li>
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<li>Fixed install target for MacOS (headers where not copied due to bug in cmake)</li>
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</ul>

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</tr>


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<tr valign=top><td><b>2.0-RC4</b> (2009/11/18,Rev.227)</td><td>
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<b>Core</b>
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<ul>
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<li> Added function for direct access to property vectors</li>
<li> Fixed clear functions to swap vectors. This frees OpenMesh memory when clear is invoked.</li>
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<li> Fixed bug in handle() function when getting handle from given Halfedge (Reported by Rob Patro)</li>
<li> Memory leak in assignment Operator (Reported by Meng Luan, Thanks to Ilya A. Kriveshko for the patch)</li>
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</ul>
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<b>Readers/Writers</b>
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<ul>
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<li> Fixed reading ply files with unknown properties</li>
<li> Added support for texture coordinates in ply files</li>
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<li> Add additional interface to readers/writers to use streams directly (allows direct writing to a streams)</li>
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<li> OMFromat -> Fixed empty template parameter issue under msvc</li>
<li> OBJReader -> fixed loading multiple objs with material files</li>
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<li> OBJWriter -> Fixed writing of normals, Missing / when skipping texture coordinates</li>
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</ul>
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<b>Build system</b>
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<ul>
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<li> Added missing c files</li>
<li> Build shared and static version under linux (cmake)</li>
<li> Added -DBUILD_APPS=OFF cmake flag to skip building of apps (cmake)</li>
<li> Added install target (cmake)</li>
<li> Added doc target (cmake)</li>
<li> Added doc-install target (cmake)</li>
<li> Generate sonames under linux (cmake)</li>
<li> Debian build dir for building Debian packages (Thanks to Jean Pierre Charalambos)</li>
<li> Package generator for windows. Builds an setup file containing precompiled static libs and includes for windows.</li>
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<li> Throw warning if a min or max macro is defined under windows and suggest NOMINMAX (Thanks to Ingo Esser)</li>
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</ul>
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<b>Documentation</b>
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<ul>
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<li> Updated Documentation Mainpage</li>
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<li> Updated properties tutorial to include all request_... functions</li>
<li> Updates for build instructions</li>
<li> Added Tutorial on deleting geometry</li>
<li> Fixed Traits example</li>
<li> Other minor fixes</li>
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<li> Added tutorials as compileable source code</li>
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</ul>
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<b>Misc</b>
<ul>
<li> Updated debian dir to build debs (Thanks to Jean Pierre Charalambos)</li>
</ul>


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</tr>
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<tr valign=top><td><b>2.0-RC3</b> (2009/06/04)</td><td>
<b>License</b>
<ul>
<li>Relicense under LGPL v3 with additional exception for template inclusion</li>
</ul>

<b>Readers/Writers</b>
<ul>
<li> PLY writer fix ( thanks to Marc Hugi )</li>
<li> PLY reader fix ( wrong parsing of uchar binary data )</li>
<li> PLY reader warnings fix ( thanks to Ilya A. Kriveshko )</li>
<li> OBJ Reader now stores texture information in additional Mesh properties</li>
<li> OBJ reader/writer fixes</li>
</ul>


<b>Tools</b>
<ul>
<li> Smother now respects feature primitives </li>
<li> Decimater improvements and fixes ( thanks to Ilya A. Kriveshko ) </li>
</ul>

<b>Build system</b>
<ul>
<li> Updated directory structure </li>
<li> Changed libnames to libOpenMesh and libOpenMeshTools </li>
<li> cmake support </li>
<li> bugfixes to qmake build system </li>
<li> Keep some basic ACGMake files around ( acgmake is deprecated!! We will not provide support for it! Please use cmake or qmake instead. ) </li>
</ul>

<b>Other</b>
<ul>
<li> Fixed some warnings with latest gcc </li>
<li> Per halfedge texture coordinates added </li>
<li> Extended functions to get available properties </li>
</ul>

</tr>





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<tr valign=top><td><b>2.0-RC2</b> (2009/02/17)</td><td> 
<ul>
<li>Fix for OBJ reader not reading texture coordinates correctly ( Thanks to Kamalneet Singh )</li>
<li>Fixed included Visual Studio files</li>
</ul>
</tr>

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<tr valign=top><td><b>2.0-RC1</b> (2009/01/28)</td><td> 
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<ul>
<li>Reader / writer have been updated</li>
<li>Some general bugfixes</li>
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<li>The usage of acgmake has become deprecated since the last release. It has been replaced by qmake</li>
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<li>Improved Documentation</li>
<li>Dropped support for acgmake which has been entirely replaced by qmake</li>
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<li>Credits to Simon Floery, Canjiang Ren, Johannes Totz, Leon Kos, Jean Pierre Charalambos, Mathieu Gauthier </li>
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</ul>
</tr>

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<tr valign=top><td><b>1.9.7</b> (2008/10/13)</td><td> 
<ul>
<li>Ported applications to qt4</li>
<li>Bugfixes in Decimater</li>
<li>Improved Documentation</li>
<li>Dropped support for gcc 3.x compilers (This does not mean that it does not work anymore)</li>
<li>Dropped support for Versions of Visual Studio older than 2008</li>
</ul>
</tr>

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<tr valign=top><td><b>1.1.0</b> (2007/02/26)</td><td> 
<ul>
<li>Fixed a VS 2005 compilation issue regarding the Sqrt3 subdivision class.</li>
<li>Fixed GCC-4.1 compilation problems.</li>
<li>The STL writer routine now correctly closes the <tt>"solid"</tt> block with <tt>"endsolid"</tt>.</li>
<li>The API of the vector class has been changed slightly due to problems with some versions of GCC:<br/>
The cast operator to the scalar type has been removed and replaced by
the function <tt>data()</tt>. Hence, existing code like
<blockquote>
<tt>Vec3f vertex;</tt><br/>
<tt>...</tt><br/>
<tt>glVertex3fv( vertex );</tt>
</blockquote>
has to be changed to
<blockquote>
<tt>Vec3f vertex;</tt><br/>
<tt>...</tt><br/>
<tt>glVertex3fv( vertex.data() );</tt>
</blockquote>
</li>
</ul>
</tr>

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<tr valign=top><td><b>1.0.0</b> (2005/09/20)</td><td> 
<ul>
<li>Mainly fixed the bugs collected in beta4.</li>
<li>Slightly changed module handling in the Decimater.</li>
<li>Removed some parts to keep the project maintainable.</li>
<li>Fixed MacOS compilation problems.</li>
<li>Compatibility for latest gcc4 compilers.</li>
</ul>
</tr>

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<tr valign=top><td><b>1.0.0-beta4</b> (2004/01/20)</td><td> 
<ul>
<li>Bugs fixed: 1.0.0-beta3:001</li>
<li>Documentation of module Core completed.</li>
<li>Documentation of module Tools::Decimater and 
    Tools::Subdivider completed.</li>
<li>Revised class structure for uniform subdivision.</li>
<li>Revised rule handling for composite adaptive subdivision.</li>
</ul>
</tr>

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<tr valign=top><td><b>1.0.0-beta3</b> (2003/12/04)</td><td> 
The beta3 fixes only the known bugs in beta2.
<ul>
<li>Bugs fixed: 1.0.0-beta2:{001, 002, 003, 004}</li>
<li><b>Known Bugs</b>:
  <ul>
    <li>001: OFFReader: Option bit not cleared before analyzing .off header.
      <br>Symptoms: If a previously read .off file had normals/texcoords,
          a second read of another file w/o normals or texcoords, will return
          with option bits normals/texcoords enabled.          
    </li>
  </ul>
</li>
</ul>
</tr>

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<tr valign=top><td><b>1.0.0-beta2</b> (2003/11/05)</td><td> 

<ul>

<li>Change of directory structure
    <pre>
+- %OpenMesh/
   +- Core/     # previously %OpenMesh
   +- Tools/    # previously OpenMeshTools
   +- Apps/     # previously OpenMeshApps
   +- Win/      # contains all solutions files and projects for MS VC++
   +- Doc/      # contains all documentation
    </pre>
    Note! The supplied script \c %OpenMesh/migrate.sh can be used to
    adjust include paths and ACGMakefiles. (It's not guarantied the
    script handles every case, but so far it did not missed a file to
    adjust.)
</li>

<li><b>Porting issues</b>: Due to a number of major changes in the
    structure of %OpenMesh a few incompatibilities have been
    introduced. Have look in <b>\c %OpenMesh/porting.txt </b> for hints how to
    treat your source when updating from 0.11.x to
     1.0.0.<br>Hint! The supplied script \c %OpenMesh/migrate.sh does a
    few of the necessary modifications. 
</li>

<li><b>The list kernel has been removed</b>
</li>

<li>Improved IO support:
  <ul>
  <li>Read/write ascii and binary STL </li>
  <li>Read/write ascii and binary OFF </li>
  <li>Support for vertex normals and vertex texcoords in OFF and OBJ</li>
  <li>Support importing diffuse material into face color property from
      OBJ files.
  </li>
  <li>Properietary binary format OM, supporting read/write of custom properties
  </li>
  </ul>
</li>

<li>Improved coordinate class OpenMesh::VectorT:
  <ul>
    <li> <tt>VectorT::vectorize(Scalar)</tt> is no longer static, now 
          it changes the vector. Use it e.g. to clear vector values. 
    </li>
    <li> Casts between two vector classes of the same dimension are now
         explicit. This avoids unwanted and expensive casts. 
    </li>
    <li> Optimized performance by manual loop-unrolling. These optimizations
	 are partial specializations for vectors of dimension 2, 3 and 4. 
         Since Microsoft's VC++ still does not support partial specialization
         and also provides rather poor loop-unrolling, users of this compiler
         are stuck to lower performance.
    </li>
  </ul>
</li>

<li>OpenSG Support:
  <ul>
    <li>New kernel type \c class TriMesh_OSGArrayKernelT<>.
      <ul>
        <li>Uses OpenSG geometry types!</li>
        <li>PolyMesh not supported, yet!</li>
      </ul>
    <li>Use \c OpenMesh::Kernel_OSG::bind<> to link a mesh obj with an
        \c osg::Geometry and vice versa.<br>Please note that both objects
        share the same data!
      <ul>
       <li>Binding a mesh to an \c osg::Geometry changes the content
           of the \c osg::Geometry!
       <li>Triangulates non-triangular faces!</li>
       <li>Multi-indexed geometry not supported!</li>
       <li>Transfer of vertex normals</li>
       <li>Limited capability to transfer colors: 
           So far, only \c osg::Color3f <-> \c OpenMesh::Vec3ub
      </ul>
    </li>
  </ul>
</li>

<li>Microsoft VC++ 7.0 projects files
  <ul>
    <li>Tutorial solution file
  </ul>
</li>

<li> New tools/applications:
     <ul>
     <li>\c Tools/VDPM (View Dependent Progressive Mesh Library)
       <ul>
         <li>\c Apps/VDProgMesh/mkbalancedpm - Create a balanced 
             progressive mesh.
         </li>
         <li>\c Apps/VDProgMesh/Analyzer - Create a view dependent 
             progressive mesh file.
         </li>
         <li>\c Apps/VDProgMesh/Synthesizer - A viewer for the VDPM file.</li>
       </ul>
     </li>
     <li>Apps/mconvert</li>
     <li>Apps/IvViewer - added support for Coin</li>
     </ul>
</li>

<li><b>Known Bugs</b>:
  The following bugs are related to the TriMesh_OSGArrayKernelT<>:
  <ul>
    <li>001: Cannot request/release the default attribute 
             <tt>halfedge_status</tt>.
    </li>
    <li>002: Cannot release the default attribute <tt>vertex_texcoords</tt>
    </li>
    <li>003: Assignment operator = () does not work properly.</li>
    <li>004: No copy-constructor available!</li>
  </ul>
</li>

</ul>
</td></tr>


<!-- --------------------------------------------------------------------- -->


<tr valign=top><td><b>0.11.1</b> (2002/12/02)</td><td>  
<ul>

<li>Bugs fixed: 0.11.0:{001, 002, 003, 004, 006}<br><br>
    006: Use acgmake version 1.1.1.
</li>

<li>Preprocessor warnings of gcc >= 3 fixed.
</li>

<li>Added some more dynamic ways to append properties to items:
    OpenMesh::Any and OpenMesh::PropertyT .
</li>

<li>VectorT: standard operator less added, Vec4f is now
    16-bit aligned using gcc compiler (for later SIMD usage).
</li>

<li>Use OM_STATIC_BUILD=1 when creating a static library.
    The static version of the library needs to included IOInstances.hh,
    which is done in that case.
    When compiling with MS VC7, the define is set automatically, as 
    the DLL-Version is not supported yet.
    acgmake (Version >= 1.1) set the define automatically when
    using the flag for static compiling.
</li>

<li>The read_mesh() methods now clears the mesh before reading a new one.
</li>

<li>Added can_read() and can_write() methods to the IOManager.
</li>


</ul>
</td></tr>


<!-- --------------------------------------------------------------------- -->
<tr valign=top><td><b>0.11.0</b> (2002/09/07)</td><td> 

<ul>

<li>Bugs fixed: 0.10.2:{001, 002, 003, 004, 005}
</li>

<li>Added MS VC++ 7.0 project files for the tutorial programms.
    (Have a look in <OpenMesh>/Win32/MSVC/)
</li>

<li>New Input/Output management, see \ref mesh_io. The new interface
    is as backwards-compatible as possible. Only the read_[off,obj]
    and write_[off,obj] methods do no longer exist. You should now
    include OpenMesh/IO/MeshIO.hh instead of MeshReader.hh and
    MeshWriter.hh. The old include files may be removed in a future
    release.
</li>

<li>Added: Generic algorithms may now define their own traits, these traits can
    be merged with other user-defined traits by the OM_Merge_Traits macro. 
    See tutorial \ref tutorial_06.
</li>

<li>Added generic handle <-> item conversions, see 
    <ul>
    <li> OpenMesh::Concepts::KernelT::handle() and
    <li> OpenMesh::PolyMeshT::deref().
    </ul>
    The kernel methods vertex_handle(), halfedge_handle(), edge_handle(), 
    face_handle() should no longer be used, but are still existent for 
    compatibility reasons. You can hide them by uncommenting the define
    OM_HIDE_DEPRECATED in OpenMesh/System/config.h.
</li>

<li>Internal methods, like Vertex::halfedge_handle() or Vertex::point() are 
    now hidden, since the respective kernel methods (like 
    MeshKernel::halfedge_handle(VertexHandle) or 
    MeshKernel::point(VertexHandle)) should be used instead.
</li>

<li>Added convenience methods for the mesh kernels: 
    <ul>
    <li>OpenMesh::Concepts::KernelT::n_halfedges()
    <li>OpenMesh::Concepts::KernelT::halfedges_empty()
    <li>OpenMesh::Concepts::KernelT::halfedge_handle(unsigned int _i)
    </ul>
</li>

<li><b>Known Bugs</b>: 
    <ul>
    <li>001: Ambigous auto_ptr<> cast in ExporterT.hh.</li>
    <li>002: BaseImporter and BaseExporter have no virtual destructor.</li>
    <li>003: Reader does not work correctly, when reading from a istream.</li>
    <li>004: cross(VectorT, VectorT) returns Scalar instead of VectorT.</li>
    <li>005: PolyMeshT::calc_face_normal() may give wrong results if the
             first 3 points of the polygon are colinear or concave.</li>
    <li>006: Reading/writing (MeshIO) of files does not work when using acgmake
             with SuSE 8.1.</li>
    </ul>
</li>

</ul> 
</td></tr>

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<tr valign=top><td><b>0.10.2</b> (2002/06/25)</td><td> 
<ul>
<li>Bugs fixed: 0.10.1:{001, 002} 
</li>

<li>The edge collapse checking method TriMeshT::is_collapse_ok() is now more
    restrictive. It prohibits cases that could be handled by the
    halfedge data structure, but would probably not be regarded as a
    legal mesh.
</li>

<li>The vertex split operation creates up to 3 new edges and 2 new
    faces. Up to now it was possible to pass handles to edges/faces
    that should be used instead of creating new ones. This option has
    been removed in order to get a cleaner interface.
</li>

<li>The MeshCheckerT has been changed slightly: it omits deleted elements, so
    one does not have to perform a garbage collection before checking the mesh.
    It also checks for the halfedges building cycles around faces or
    boundaries.
</li>

<li><b>Known Bugs</b>: 
    <ul>
    <li>001: OpenMesh::PolyMeshT::operator=() does not return \c *this.
    <li>002: OpenMesh::DefaultAttributer added unnecessary 20 bits to the 
             elementary mesh types.
    </ul>
</li> 
</ul> 
</td></tr>

<!-- --------------------------------------------------------------------- -->

<tr valign=top><td><b>0.10.1</b> (2002/04/22)</td><td> 
<ul>
<li>Bugs fixed: 0.10.0:{001, 002, 003, 004, 005} 
</li>

<li>Added: Predefined attribute \c TexCoord. 
</li>

<li>Added: Support for MS VC++ 6.0 IDE with Intel Compiler. 
</li>

<li>Added: Tutorial 6 on generic algorithms. 
</li>

<li>SharedCoordArrayKernelT is now derived from ArrayKernelT.
</li>

<li>Added: Assignment operator operator=() for PolyMeshT and TriMeshT.
</li>

<li>Added: Method TriMeshT::is_collapse_ok(), checking topological conditions
    for a given halfedge collapse.
</li>

<li><b>Known Bugs</b>: 
    <ul>
    <li>001: PolyMeshT::delete_face(): Outgoing halfedge handle of
             a vertex can incorrectly be invalidated. Influences
             vertex circulators, find_halfedge() and therefore
             add_face().<br>
             Workaround: Replace <tt>v0</tt> by <tt>v1</tt> in line 585 of
	     PolyMeshT.cc
    </li>
    <li>002: TriMeshT::collapse(): Some special cases are incorrectly
             handled when collapsing boundary halfedges. The same
             cases are also incorrect for the inverse operation
             TriMeshT::vertex_split() operation. 
    </li>
    </ul>
</li>
</ul>
</td></tr>

<!-- --------------------------------------------------------------------- -->

<tr valign=top><td><b>0.10.0</b> (2002/03/19)</td><td> 
<ul>
<li>Interface for specifying the traits classes simplified (see
    Traits.hh).  
</li>

<li>Changed attribute handling; the attributer class (the class that
    adds and registers attributes to mesh items) can be provided by
    the user.
</li>

<li>Removed MyMesh::Face::n_vertices() and
    MyMesh::Face::set_n_vertices().
</li>

<li>MeshWriter::write_* changed accordingly.
</li>

<li>Bug fix: PolyMeshT::delete_[face,edge,vertex] now work correctly.
</li>

<li>Removed cyclic dependency between items and kernel, because MS
    VC++ cannot handle the resulting template forward declaration
    :-(. Therefore the <tt>Base::Refs</tt> class, given for the traits
    classes, no longer provides the types \c Vertex, \c Halfedge, \c
    Edge, and \c Face. It now only provides all handle types, the
    point and the scalar type.
</li>

<li>Finally: MS VC++ 7.0 supported.
</li>

<li><b>Known Bugs</b>:
    <ul> 
    <li>001: TriMeshT.cc::vertex_split(): call to undefined
        method Face::set_n_vertices().<br>
        Workaround: Comment out the two occurences of the call.
    </li>
    <li>002: Missing <tt>\#include
        <OpenMesh/Mesh/Kernels/ListKernel/ListHandles.hh></tt>
	in OpenMesh/Mesh/Types/PolyMesh_ListKernelT.hh.
    </li>
    <li>003: Special case in TriMeshT::edge_collapse(): when collapsing a 
        boundary vertex into an interior one, the outgoing halfedge of
        the resulting vertex my not be a boundary one.
    </li>
    <li>004: PolyMeshT::delete_edge did not pass its argument 
        _delete_isolated_vertices to PolyMeshT::delete_face.
    </li>
    <li>005: PolyMeshT::assign() was not linked because of an \#if error.
    </ul>
</li>
</ul>
</td></tr>

<!-- --------------------------------------------------------------------- -->

<tr valign=top><td><b>0.9.2</b> (-) </td><td> 
<ul>
<li>PolyMeshT::add_face() now detects more topological errors.
</li>

<li>Added mesh kernel methods: remove_last_[vertex,edge,face]().
</li>

</ul>
</td></tr>

<!-- --------------------------------------------------------------------- -->

<tr valign=top><td><b>0.9.1</b> (2002/02/07)</td><td> 
<ul>
<li>Changed the main namespace from ACG to OpenMesh.
</li>

<li>Added invalid handle constants, e.g. PolyMeshT::InvalidVertexHandle.
</li>

<li>Mesh provides circulators: PolyMeshT::vv_iter(VertexHandle).
</li>
</ul>
</td></tr>

<!-- --------------------------------------------------------------------- -->

<tr valign=top><td><b> 0.9</b> (2002/01/25)</td><td> 
<ul>
<li>initial release</li>
</ul>
</td></tr>


</table>

\endhtmlonly

**/