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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkQuadEdgeMeshNormalFilter.txx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkQuadEdgeMeshNormalFilter_txx
#define __itkQuadEdgeMeshNormalFilter_txx
#include "itkQuadEdgeMeshNormalFilter.h"
namespace itk
{
template< class TInputMesh, class TOutputMesh >
QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >
::QuadEdgeMeshNormalFilter( )
{
this->m_Weight = THURMER;
}
template< class TInputMesh, class TOutputMesh >
QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >
::~QuadEdgeMeshNormalFilter( )
{
}
template< class TInputMesh, class TOutputMesh >
typename QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >::OutputFaceNormalType
QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >
::ComputeFaceNormal( OutputPolygonType* iPoly )
{
OutputMeshPointer output = this->GetOutput( );
OutputPointType pt[3];
int k( 0 );
OutputQEType* edge = iPoly->GetEdgeRingEntry( );
OutputQEType* temp = edge;
do
{
pt[k++] = output->GetPoint( temp->GetOrigin( ) );
temp = temp->GetLnext( );
} while( temp != edge );
return TriangleType::ComputeNormal( pt[0], pt[1], pt[2] );
}
template< class TInputMesh, class TOutputMesh >
void
QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >
::ComputeAllFaceNormals( )
{
OutputMeshPointer output = this->GetOutput( );
OutputPolygonType* poly;
for( OutputCellsContainerConstIterator
cell_it = output->GetCells( )->Begin( );
cell_it != output->GetCells( )->End( );
++cell_it )
{
poly = dynamic_cast< OutputPolygonType* >( cell_it.Value( ) );
if( poly != 0 )
{
if( poly->GetNumberOfPoints( ) == 3 )
{
output->SetCellData( cell_it->Index( ), ComputeFaceNormal( poly ) );
}
}
}
}
template< class TInputMesh, class TOutputMesh >
void
QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >
::ComputeAllVertexNormals( )
{
OutputMeshPointer output = this->GetOutput( );
OutputPointsContainerPointer points = output->GetPoints( );
OutputPointIdentifier id;
for( OutputPointsContainerIterator it = points->Begin( );
it != points->End( );
++it )
{
id = it->Index( );
output->SetPointData( id, ComputeVertexNormal( id ) );
}
}
template< class TInputMesh, class TOutputMesh >
typename QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >::OutputVertexNormalType
QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >
::ComputeVertexNormal( const OutputPointIdentifier& iId )
{
OutputMeshPointer output = this->GetOutput( );
OutputQEType* edge = output->FindEdge( iId );
OutputQEType* temp = edge;
OutputCellIdentifier cell_id( 0 );
OutputVertexNormalType n( 0. );
OutputFaceNormalType face_normal( 0. );
do
{
cell_id = temp->GetLeft( );
if( cell_id != OutputMeshType::m_NoFace )
{
output->GetCellData( cell_id, &face_normal );
n += face_normal * Weight( iId, cell_id );
}
temp = temp->GetOnext( );
} while( temp != edge );
n.Normalize( );
return n;
}
template< class TInputMesh, class TOutputMesh >
typename QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >::OutputVertexNormalComponentType
QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >
::Weight( const OutputPointIdentifier& iPId, const OutputCellIdentifier& iCId )
{
if( m_Weight == GOURAUD )
{
return static_cast< OutputVertexNormalComponentType >( 1.0 );
}
else
{
OutputMeshPointer output = this->GetOutput( );
OutputPolygonType* poly = dynamic_cast< OutputPolygonType* >(
output->GetCells( )->GetElement( iCId ) );
if( poly != 0 ) // this test should be removed...
{
// this test should be removed...
if( poly->GetNumberOfPoints( ) == 3 )
{
int internal_id( 0 ), k( 0 );
OutputPointType pt[3];
OutputVectorType u, v;
OutputQEType* edge = poly->GetEdgeRingEntry( );
OutputQEType* temp = edge;
do
{
pt[k] = output->GetPoint( temp->GetOrigin( ) );
if( temp->GetOrigin( ) == iPId )
internal_id = k;
temp = temp->GetLnext( );
k++;
} while( temp != edge );
switch( m_Weight )
{
default:
case GOURAUD:
{
return static_cast< OutputVertexNormalComponentType >( 1. );
}
case THURMER:
{
// this implementation may be included inside itkTriangle
switch( internal_id )
{
case 0:
u = pt[1] - pt[0];
v = pt[2] - pt[0];
break;
case 1:
u = pt[0] - pt[1];
v = pt[2] - pt[1];
break;
case 2:
u = pt[0] - pt[2];
v = pt[1] - pt[2];
break;
}
typename OutputVectorType::RealValueType norm2_u = u.GetSquaredNorm();
if( norm2_u > vnl_math::eps )
{
norm2_u = 1. / norm2_u;
u *= norm2_u;
}
typename OutputVectorType::RealValueType norm2_v = v.GetSquaredNorm();
if( norm2_v > vnl_math::eps )
{
norm2_v = 1. / norm2_v;
v *= norm2_v;
}
return static_cast< OutputVertexNormalComponentType >(
vcl_acos( u * v ) );
}
case AREA:
{
return static_cast< OutputVertexNormalComponentType >(
TriangleType::ComputeArea( pt[0], pt[1], pt[2] ) );
}
}
}
else
{
std::cout <<"Input should be a triangular mesh!!!" <<std::endl;
return static_cast< OutputVertexNormalComponentType >( 0. );
}
}
else
{
return static_cast< OutputVertexNormalComponentType >( 0. );
}
}
}
template< class TInputMesh, class TOutputMesh >
void QuadEdgeMeshNormalFilter< TInputMesh, TOutputMesh >
::GenerateData( )
{
this->CopyInputMeshToOutputMesh( );
this->ComputeAllFaceNormals( );
this->ComputeAllVertexNormals( );
}
}
#endif
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