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<div class="headertitle"><div class="title">Polyhedron/polyhedron_prog_normals.cpp</div></div>
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<div class="fragment"><div class="line"><span class="preprocessor">#include <CGAL/Homogeneous.h></span></div>
<div class="line"><span class="preprocessor">#include <CGAL/Polyhedron_traits_with_normals_3.h></span></div>
<div class="line"><span class="preprocessor">#include <CGAL/Polyhedron_3.h></span></div>
<div class="line"><span class="preprocessor">#include <iostream></span></div>
<div class="line"><span class="preprocessor">#include <algorithm></span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">struct </span>Normal_vector {</div>
<div class="line"> <span class="keyword">template</span> <<span class="keyword">class</span> Facet></div>
<div class="line"> <span class="keyword">typename</span> Facet::Plane_3 operator()( Facet& f) {</div>
<div class="line"> <span class="keyword">typename</span> Facet::Halfedge_handle h = f.halfedge();</div>
<div class="line"> <span class="comment">// Facet::Plane_3 is the normal vector type. We assume the</span></div>
<div class="line"> <span class="comment">// CGAL Kernel here and use its global functions.</span></div>
<div class="line"> <span class="keywordflow">return</span> <a id="a0" name="a0"></a><a class="code hl_functionRef" href="../Kernel_23/group__cross__product__grp.html#gab032f9890a983dff3e0a29346318176e">CGAL::cross_product</a>(</div>
<div class="line"> h->next()->vertex()->point() - h->vertex()->point(),</div>
<div class="line"> h->next()->next()->vertex()->point() - h->next()->vertex()->point());</div>
<div class="line"> }</div>
<div class="line">};</div>
<div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <a id="_a1" name="_a1"></a><a class="code hl_structRef" href="../Kernel_23/structCGAL_1_1Homogeneous.html">CGAL::Homogeneous<int></a> <a class="code hl_namespaceRef" href="../Kernel_23/namespaceKernel.html">Kernel</a>;</div>
<div class="line"><span class="keyword">typedef</span> <a id="_a2" name="_a2"></a><a class="code hl_classRef" href="../Kernel_23/classKernel_1_1Point__3.html">Kernel::Point_3</a> Point_3;</div>
<div class="line"><span class="keyword">typedef</span> <a id="_a3" name="_a3"></a><a class="code hl_classRef" href="../Kernel_23/classKernel_1_1Vector__3.html">Kernel::Vector_3</a> Vector_3;</div>
<div class="line"><span class="keyword">typedef</span> <a id="_a4" name="_a4"></a><a class="code hl_class" href="classCGAL_1_1Polyhedron__traits__with__normals__3.html">CGAL::Polyhedron_traits_with_normals_3<Kernel></a> Traits;</div>
<div class="line"><span class="keyword">typedef</span> <a id="_a5" name="_a5"></a><a class="code hl_class" href="classCGAL_1_1Polyhedron__3.html">CGAL::Polyhedron_3<Traits></a> Polyhedron;</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main() {</div>
<div class="line"> Point_3 p( 1, 0, 0);</div>
<div class="line"> Point_3 q( 0, 1, 0);</div>
<div class="line"> Point_3 r( 0, 0, 1);</div>
<div class="line"> Point_3 s( 0, 0, 0);</div>
<div class="line"> Polyhedron P;</div>
<div class="line"> P.make_tetrahedron( p, q, r, s);</div>
<div class="line"> std::transform( P.facets_begin(), P.facets_end(), P.planes_begin(),</div>
<div class="line"> Normal_vector());</div>
<div class="line"> <a id="a6" name="a6"></a><a class="code hl_functionRef" href="../Stream_support/group__PkgStreamSupportRef.html#ga2cbb865dd83eedd780f4a452635b1d28">CGAL::IO::set_pretty_mode</a>( std::cout);</div>
<div class="line"> std::copy( P.planes_begin(), P.planes_end(),</div>
<div class="line"> std::ostream_iterator<Vector_3>( std::cout, <span class="stringliteral">"\n"</span>));</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="ttc" id="aclassCGAL_1_1Polyhedron__3_html"><div class="ttname"><a href="classCGAL_1_1Polyhedron__3.html">CGAL::Polyhedron_3</a></div><div class="ttdoc">A polyhedral surface Polyhedron_3 consists of vertices V, edges E, facets F and an incidence relation...</div><div class="ttdef"><b>Definition:</b> Polyhedron_3.h:113</div></div>
<div class="ttc" id="aclassCGAL_1_1Polyhedron__traits__with__normals__3_html"><div class="ttname"><a href="classCGAL_1_1Polyhedron__traits__with__normals__3.html">CGAL::Polyhedron_traits_with_normals_3</a></div><div class="ttdoc">The class Polyhedron_traits_with_normals_3 is a model of the PolyhedronTraits_3 concept.</div><div class="ttdef"><b>Definition:</b> Polyhedron_traits_with_normals_3.h:30</div></div>
<div class="ttc" id="aclassKernel_1_1Point__3_html"><div class="ttname"><a href="../Kernel_23/classKernel_1_1Point__3.html">Kernel::Point_3</a></div></div>
<div class="ttc" id="aclassKernel_1_1Vector__3_html"><div class="ttname"><a href="../Kernel_23/classKernel_1_1Vector__3.html">Kernel::Vector_3</a></div></div>
<div class="ttc" id="agroup__PkgStreamSupportRef_html_ga2cbb865dd83eedd780f4a452635b1d28"><div class="ttname"><a href="../Stream_support/group__PkgStreamSupportRef.html#ga2cbb865dd83eedd780f4a452635b1d28">CGAL::IO::set_pretty_mode</a></div><div class="ttdeci">Mode set_pretty_mode(std::ios &s)</div></div>
<div class="ttc" id="agroup__cross__product__grp_html_gab032f9890a983dff3e0a29346318176e"><div class="ttname"><a href="../Kernel_23/group__cross__product__grp.html#gab032f9890a983dff3e0a29346318176e">CGAL::cross_product</a></div><div class="ttdeci">CGAL::Vector_3< Kernel > cross_product(const CGAL::Vector_3< Kernel > &u, const CGAL::Vector_3< Kernel > &v)</div></div>
<div class="ttc" id="anamespaceKernel_html"><div class="ttname"><a href="../Kernel_23/namespaceKernel.html">Kernel</a></div></div>
<div class="ttc" id="astructCGAL_1_1Homogeneous_html"><div class="ttname"><a href="../Kernel_23/structCGAL_1_1Homogeneous.html">CGAL::Homogeneous</a></div></div>
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