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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkHexahedronCell.txx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:36 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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DEF |
#ifndef _itkHexahedronCell_txx |
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DEF |
#define _itkHexahedronCell_txx |
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#include "itkHexahedronCell.h" |
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#include "vnl/vnl_matrix_fixed.h" |
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#include "vnl/algo/vnl_determinant.h" |
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namespace itk |
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{ |
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/** |
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* Standard CellInterface: |
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*/ |
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template <typename TCellInterface > |
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void |
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HexahedronCell< TCellInterface > |
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::MakeCopy(CellAutoPointer & cellPointer) const |
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{ |
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cellPointer.TakeOwnership( new Self ); |
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cellPointer->SetPointIds(this->GetPointIds()); |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Get the topological dimension of this cell. |
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*/ |
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template <typename TCellInterface> |
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unsigned int |
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HexahedronCell< TCellInterface > |
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::GetDimension(void) const |
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{ |
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return Self::CellDimension; |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Get the number of points required to define the cell. |
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*/ |
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template <typename TCellInterface> |
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unsigned int |
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HexahedronCell< TCellInterface > |
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::GetNumberOfPoints(void) const |
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{ |
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return Self::NumberOfPoints; |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Get the number of boundary features of the given dimension. |
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*/ |
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template <typename TCellInterface> |
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typename HexahedronCell< TCellInterface >::CellFeatureCount |
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HexahedronCell< TCellInterface > |
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::GetNumberOfBoundaryFeatures(int dimension) const |
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{ |
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switch (dimension) |
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{ |
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case 0: return GetNumberOfVertices(); |
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case 1: return GetNumberOfEdges(); |
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case 2: return GetNumberOfFaces(); |
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default: return 0; |
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} |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Get the boundary feature of the given dimension specified by the given |
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* cell feature Id. |
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* The Id can range from 0 to GetNumberOfBoundaryFeatures(dimension)-1. |
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*/ |
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template <typename TCellInterface> |
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bool |
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HexahedronCell< TCellInterface > |
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::GetBoundaryFeature(int dimension, CellFeatureIdentifier featureId, |
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CellAutoPointer & cellPointer ) |
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{ |
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switch (dimension) |
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{ |
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case 0: |
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IND |
****{ |
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IND |
****VertexAutoPointer vertexPointer; |
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IND |
****if( this->GetVertex(featureId,vertexPointer) ) |
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IND |
******{ |
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******TransferAutoPointer(cellPointer,vertexPointer); |
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******return true; |
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******} |
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****else |
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******{ |
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******cellPointer.Reset(); |
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******return false; |
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******} |
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****break; |
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****} |
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case 1: |
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****{ |
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****EdgeAutoPointer edgePointer; |
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****if( this->GetEdge(featureId,edgePointer) ) |
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******{ |
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******TransferAutoPointer(cellPointer,edgePointer); |
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******return true; |
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******} |
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****else |
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******{ |
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******cellPointer.Reset(); |
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******return false; |
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******} |
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****break; |
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****} |
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case 2: |
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****{ |
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****FaceAutoPointer facePointer; |
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****if( this->GetFace(featureId,facePointer) ) |
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******{ |
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******TransferAutoPointer(cellPointer,facePointer); |
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******return true; |
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******} |
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****else |
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******{ |
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******cellPointer.Reset(); |
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******return false; |
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******} |
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****break; |
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****} |
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default: |
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****{ |
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****cellPointer.Reset(); |
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****return false; |
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****} |
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} |
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return false; |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Set the point id list used by the cell. It is assumed that the given |
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* iterator can be incremented and safely de-referenced enough times to |
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* get all the point ids needed by the cell. |
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*/ |
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template <typename TCellInterface> |
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void |
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HexahedronCell< TCellInterface > |
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::SetPointIds(PointIdConstIterator first) |
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{ |
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PointIdConstIterator ii(first); |
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for(int i=0; i < Self::NumberOfPoints ; ++i) |
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{ |
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m_PointIds[i] = *ii++; |
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} |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Set the point id list used by the cell. It is assumed that the range |
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* of iterators [first, last) contains the correct number of points needed to |
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* define the cell. The position *last is NOT referenced, so it can safely |
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* be one beyond the end of an array or other container. |
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*/ |
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template <typename TCellInterface> |
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void |
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HexahedronCell< TCellInterface > |
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::SetPointIds(PointIdConstIterator first, PointIdConstIterator last) |
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{ |
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int localId=0; |
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PointIdConstIterator ii(first); |
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|
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while(ii != last) |
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{ |
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m_PointIds[localId++] = *ii++; |
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} |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Set an individual point identifier in the cell. |
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*/ |
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template <typename TCellInterface> |
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void |
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HexahedronCell< TCellInterface > |
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::SetPointId(int localId, PointIdentifier ptId) |
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{ |
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m_PointIds[localId] = ptId; |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Get a begin iterator to the list of point identifiers used by the cell. |
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*/ |
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template <typename TCellInterface> |
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typename HexahedronCell< TCellInterface >::PointIdIterator |
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HexahedronCell< TCellInterface > |
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::PointIdsBegin(void) |
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{ |
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return &m_PointIds[0]; |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Get a const begin iterator to the list of point identifiers used |
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* by the cell. |
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*/ |
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template <typename TCellInterface> |
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typename HexahedronCell< TCellInterface >::PointIdConstIterator |
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HexahedronCell< TCellInterface > |
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::PointIdsBegin(void) const |
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{ |
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return &m_PointIds[0]; |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Get an end iterator to the list of point identifiers used by the cell. |
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*/ |
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template <typename TCellInterface> |
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typename HexahedronCell< TCellInterface >::PointIdIterator |
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HexahedronCell< TCellInterface > |
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::PointIdsEnd(void) |
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{ |
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return &m_PointIds[Self::NumberOfPoints]; |
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} |
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|
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/** |
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* Standard CellInterface: |
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* Get a const end iterator to the list of point identifiers used |
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* by the cell. |
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*/ |
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template <typename TCellInterface> |
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typename HexahedronCell< TCellInterface >::PointIdConstIterator |
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HexahedronCell< TCellInterface > |
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::PointIdsEnd(void) const |
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{ |
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return &m_PointIds[Self::NumberOfPoints]; |
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} |
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|
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/** |
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* Hexahedron-specific: |
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* Get the number of vertices defining the hexahedron. |
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*/ |
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template <typename TCellInterface> |
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typename HexahedronCell< TCellInterface >::CellFeatureCount |
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HexahedronCell< TCellInterface > |
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::GetNumberOfVertices(void) const |
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{ |
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return Self::NumberOfVertices; |
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} |
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|
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/** |
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* Hexahedron-specific: |
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* Get the number of edges defined for the hexahedron. |
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*/ |
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template <typename TCellInterface> |
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typename HexahedronCell< TCellInterface >::CellFeatureCount |
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HexahedronCell< TCellInterface > |
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::GetNumberOfEdges(void) const |
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{ |
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return Self::NumberOfEdges; |
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} |
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|
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/** |
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* Hexahedron-specific: |
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* Get the number of faces defined for the hexahedron. |
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*/ |
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template <typename TCellInterface> |
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typename HexahedronCell< TCellInterface >::CellFeatureCount |
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HexahedronCell< TCellInterface > |
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::GetNumberOfFaces(void) const |
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{ |
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return Self::NumberOfFaces; |
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} |
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|
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/** |
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* Hexahedron-specific: |
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* Get the vertex specified by the given cell feature Id. |
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* The Id can range from 0 to GetNumberOfVertices()-1. |
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*/ |
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template <typename TCellInterface> |
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bool |
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HexahedronCell< TCellInterface > |
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::GetVertex(CellFeatureIdentifier vertexId,VertexAutoPointer & vertexPointer ) |
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{ |
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VertexType * vert = new VertexType; |
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vert->SetPointId(0, m_PointIds[vertexId]); |
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vertexPointer.TakeOwnership( vert ); |
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return true; |
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} |
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|
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/** |
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* Hexahedron-specific: |
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* Get the edge specified by the given cell feature Id. |
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* The Id can range from 0 to GetNumberOfEdges()-1. |
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*/ |
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template <typename TCellInterface> |
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bool |
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HexahedronCell< TCellInterface > |
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::GetEdge(CellFeatureIdentifier edgeId, EdgeAutoPointer & edgePointer ) |
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{ |
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EdgeType * edge = new EdgeType; |
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for(int i=0; i < EdgeType::NumberOfPoints; ++i) |
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{ |
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edge->SetPointId(i, m_PointIds[ m_Edges[edgeId][i] ]); |
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} |
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edgePointer.TakeOwnership( edge ); |
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return true; |
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} |
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|
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|
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/** |
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* Hexahedron-specific: |
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* Get the face specified by the given cell feature Id. |
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* The Id can range from 0 to GetNumberOfFaces()-1. |
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*/ |
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template <typename TCellInterface> |
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bool |
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HexahedronCell< TCellInterface > |
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::GetFace(CellFeatureIdentifier faceId, FaceAutoPointer & facePointer ) |
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{ |
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FaceType * face = new FaceType; |
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for(unsigned int i=0; i < FaceType::NumberOfPoints; ++i) |
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{ |
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face->SetPointId(i, m_PointIds[ m_Faces[faceId][i] ]); |
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} |
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facePointer.TakeOwnership( face ); |
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return true; |
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} |
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|
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/** Evaluate the position inside the cell */ |
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template <typename TCellInterface> |
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bool |
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HexahedronCell< TCellInterface > |
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::EvaluatePosition(CoordRepType* x, |
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PointsContainer* points, |
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CoordRepType* closestPoint, |
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CoordRepType pcoord[3], |
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double* dist2, |
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InterpolationWeightType* weight) |
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{ |
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static const int ITK_HEX_MAX_ITERATION=10; |
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static const double ITK_HEX_CONVERGED=1.e-03; |
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static const double ITK_DIVERGED = 1.e6; |
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|
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int iteration, converged; |
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double params[3]; |
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double fcol[3], rcol[3], scol[3], tcol[3]; |
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int i, j; |
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double d; |
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PointType pt; |
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CoordRepType derivs[24]; |
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InterpolationWeightType weights[8]; |
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|
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// set initial position for Newton's method |
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int subId = 0; |
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CoordRepType pcoords[3]; |
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pcoords[0] = pcoords[1] = pcoords[2] = params[0] = params[1] = params[2]=0.5; |
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|
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// enter iteration loop |
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for (iteration=converged=0; |
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!converged && (iteration < ITK_HEX_MAX_ITERATION); iteration++) |
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{ |
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// calculate element interpolation functions and derivatives |
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this->InterpolationFunctions(pcoords, weights); |
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this->InterpolationDerivs(pcoords, derivs); |
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|
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// calculate newton functions |
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for (i=0; i<3; i++) |
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{ |
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fcol[i] = rcol[i] = scol[i] = tcol[i] = 0.0; |
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} |
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for (i=0; i<8; i++) |
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{ |
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pt = points->GetElement( m_PointIds[i] ); |
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for (j=0; j<3; j++) |
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{ |
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fcol[j] += pt[j] * weights[i]; |
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rcol[j] += pt[j] * derivs[i]; |
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scol[j] += pt[j] * derivs[i+8]; |
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tcol[j] += pt[j] * derivs[i+16]; |
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} |
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} |
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|
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for (i=0; i<3; i++) |
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{ |
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fcol[i] -= x[i]; |
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} |
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|
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// compute determinants and generate improvements |
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vnl_matrix_fixed<CoordRepType,3,PointDimension> mat; |
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for(i=0;i<PointDimension;i++) |
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{ |
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mat.put(0,i,rcol[i]); |
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mat.put(1,i,scol[i]); |
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mat.put(2,i,tcol[i]); |
| 406 |
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} |
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|
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d = vnl_determinant(mat); |
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//d=vtkMath::Determinant3x3(rcol,scol,tcol); |
| 410 |
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if ( fabs(d) < 1.e-20) |
| 411 |
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{ |
| 412 |
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return false; |
| 413 |
|
} |
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|
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|
vnl_matrix_fixed<CoordRepType,3,PointDimension> mat1; |
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for(i=0;i<PointDimension;i++) |
| 417 |
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{ |
| 418 |
|
mat1.put(0,i,fcol[i]); |
| 419 |
|
mat1.put(1,i,scol[i]); |
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mat1.put(2,i,tcol[i]); |
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} |
| 422 |
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|
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|
vnl_matrix_fixed<CoordRepType,3,PointDimension> mat2; |
| 424 |
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for(i=0;i<PointDimension;i++) |
| 425 |
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{ |
| 426 |
|
mat2.put(0,i,rcol[i]); |
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mat2.put(1,i,fcol[i]); |
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mat2.put(2,i,tcol[i]); |
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} |
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|
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vnl_matrix_fixed<CoordRepType,3,PointDimension> mat3; |
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for(i=0;i<PointDimension;i++) |
| 433 |
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{ |
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mat3.put(0,i,rcol[i]); |
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mat3.put(1,i,scol[i]); |
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mat3.put(2,i,fcol[i]); |
| 437 |
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} |
| 438 |
|
|
| 439 |
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pcoords[0] = params[0] - vnl_determinant(mat1) / d; |
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pcoords[1] = params[1] - vnl_determinant(mat2) / d; |
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pcoords[2] = params[2] - vnl_determinant(mat3) / d; |
| 442 |
|
|
| 443 |
|
if(pcoord) |
| 444 |
|
{ |
| 445 |
|
pcoord[0] = pcoords[0]; |
| 446 |
|
pcoord[1] = pcoords[1]; |
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|
pcoord[2] = pcoords[2]; |
| 448 |
|
} |
| 449 |
|
|
| 450 |
|
// check for convergence |
| 451 |
|
if ( ((fabs(pcoords[0]-params[0])) < ITK_HEX_CONVERGED) && |
| 452 |
|
((fabs(pcoords[1]-params[1])) < ITK_HEX_CONVERGED) && |
| 453 |
|
((fabs(pcoords[2]-params[2])) < ITK_HEX_CONVERGED) ) |
| 454 |
|
{ |
| 455 |
|
converged = 1; |
| 456 |
|
} |
| 457 |
|
|
| 458 |
|
// Test for bad divergence (S.Hirschberg 11.12.2001) |
| 459 |
|
else if ((fabs(pcoords[0]) > ITK_DIVERGED) || |
| 460 |
IND |
*************(fabs(pcoords[1]) > ITK_DIVERGED) || |
| 461 |
IND |
*************(fabs(pcoords[2]) > ITK_DIVERGED)) |
| 462 |
|
{ |
| 463 |
|
return -1; |
| 464 |
|
} |
| 465 |
|
|
| 466 |
|
// if not converged, repeat |
| 467 |
|
else |
| 468 |
|
{ |
| 469 |
|
params[0] = pcoords[0]; |
| 470 |
|
params[1] = pcoords[1]; |
| 471 |
|
params[2] = pcoords[2]; |
| 472 |
|
} |
| 473 |
|
} |
| 474 |
|
|
| 475 |
|
// if not converged, set the parametric coordinates to arbitrary values |
| 476 |
|
// outside of element |
| 477 |
|
if ( !converged ) |
| 478 |
|
{ |
| 479 |
|
return false; |
| 480 |
|
} |
| 481 |
|
|
| 482 |
|
this->InterpolationFunctions(pcoords, weights); |
| 483 |
|
|
| 484 |
|
if(weight) |
| 485 |
|
{ |
| 486 |
|
for(unsigned int i=0;i<8;i++) |
| 487 |
|
{ |
| 488 |
|
weight[i] = weights[i]; |
| 489 |
|
} |
| 490 |
|
} |
| 491 |
|
|
| 492 |
|
if ( pcoords[0] >= -0.001 && pcoords[0] <= 1.001 && |
| 493 |
|
pcoords[1] >= -0.001 && pcoords[1] <= 1.001 && |
| 494 |
|
pcoords[2] >= -0.001 && pcoords[2] <= 1.001 ) |
| 495 |
|
{ |
| 496 |
|
if (closestPoint) |
| 497 |
|
{ |
| 498 |
|
closestPoint[0] = x[0]; closestPoint[1] = x[1]; closestPoint[2] = x[2]; |
| 499 |
|
*dist2 = 0.0; //inside hexahedron |
| 500 |
|
} |
| 501 |
|
return true; |
| 502 |
|
} |
| 503 |
|
else |
| 504 |
|
{ |
| 505 |
|
CoordRepType pc[3], w[8]; |
| 506 |
|
if (closestPoint) |
| 507 |
|
{ |
| 508 |
|
for (i=0; i<3; i++) //only approximate, not really true for warped hexa |
| 509 |
|
{ |
| 510 |
|
if (pcoords[i] < 0.0) |
| 511 |
|
{ |
| 512 |
|
pc[i] = 0.0; |
| 513 |
|
} |
| 514 |
|
else if (pcoords[i] > 1.0) |
| 515 |
|
{ |
| 516 |
|
pc[i] = 1.0; |
| 517 |
|
} |
| 518 |
|
else |
| 519 |
|
{ |
| 520 |
|
pc[i] = pcoords[i]; |
| 521 |
|
} |
| 522 |
|
} |
| 523 |
LEN |
this->EvaluateLocation(subId, points, pc, closestPoint, (CoordRepType *)w); |
| 524 |
|
|
| 525 |
|
*dist2 = 0; |
| 526 |
|
for(unsigned int i=0;i<3;i++) |
| 527 |
|
{ |
| 528 |
|
*dist2 += (closestPoint[i]-x[i])*(closestPoint[i]-x[i]); |
| 529 |
|
} |
| 530 |
|
} |
| 531 |
|
return false; |
| 532 |
|
} |
| 533 |
|
} |
| 534 |
|
|
| 535 |
|
/** Compute iso-parametric interpolation functions */ |
| 536 |
|
template <typename TCellInterface> |
| 537 |
|
void |
| 538 |
|
HexahedronCell< TCellInterface > |
| 539 |
|
::InterpolationFunctions(CoordRepType pcoords[3], CoordRepType sf[8]) |
| 540 |
|
{ |
| 541 |
|
double rm, sm, tm; |
| 542 |
|
|
| 543 |
|
rm = 1. - pcoords[0]; |
| 544 |
|
sm = 1. - pcoords[1]; |
| 545 |
|
tm = 1. - pcoords[2]; |
| 546 |
|
|
| 547 |
|
sf[0] = rm*sm*tm; |
| 548 |
|
sf[1] = pcoords[0]*sm*tm; |
| 549 |
|
sf[2] = pcoords[0]*pcoords[1]*tm; |
| 550 |
|
sf[3] = rm*pcoords[1]*tm; |
| 551 |
|
sf[4] = rm*sm*pcoords[2]; |
| 552 |
|
sf[5] = pcoords[0]*sm*pcoords[2]; |
| 553 |
|
sf[6] = pcoords[0]*pcoords[1]*pcoords[2]; |
| 554 |
|
sf[7] = rm*pcoords[1]*pcoords[2]; |
| 555 |
|
} |
| 556 |
|
|
| 557 |
|
/** Compute iso-parametric interpolation functions */ |
| 558 |
|
template <typename TCellInterface> |
| 559 |
|
void |
| 560 |
|
HexahedronCell< TCellInterface > |
| 561 |
|
::InterpolationDerivs(CoordRepType pcoords[3], CoordRepType derivs[24]) |
| 562 |
|
{ |
| 563 |
|
double rm, sm, tm; |
| 564 |
|
|
| 565 |
|
rm = 1. - pcoords[0]; |
| 566 |
|
sm = 1. - pcoords[1]; |
| 567 |
|
tm = 1. - pcoords[2]; |
| 568 |
|
|
| 569 |
|
// r-derivatives |
| 570 |
|
derivs[0] = -sm*tm; |
| 571 |
|
derivs[1] = sm*tm; |
| 572 |
|
derivs[2] = pcoords[1]*tm; |
| 573 |
|
derivs[3] = -pcoords[1]*tm; |
| 574 |
|
derivs[4] = -sm*pcoords[2]; |
| 575 |
|
derivs[5] = sm*pcoords[2]; |
| 576 |
|
derivs[6] = pcoords[1]*pcoords[2]; |
| 577 |
|
derivs[7] = -pcoords[1]*pcoords[2]; |
| 578 |
|
|
| 579 |
|
// s-derivatives |
| 580 |
|
derivs[8] = -rm*tm; |
| 581 |
|
derivs[9] = -pcoords[0]*tm; |
| 582 |
|
derivs[10] = pcoords[0]*tm; |
| 583 |
|
derivs[11] = rm*tm; |
| 584 |
|
derivs[12] = -rm*pcoords[2]; |
| 585 |
|
derivs[13] = -pcoords[0]*pcoords[2]; |
| 586 |
|
derivs[14] = pcoords[0]*pcoords[2]; |
| 587 |
|
derivs[15] = rm*pcoords[2]; |
| 588 |
|
|
| 589 |
|
// t-derivatives |
| 590 |
|
derivs[16] = -rm*sm; |
| 591 |
|
derivs[17] = -pcoords[0]*sm; |
| 592 |
|
derivs[18] = -pcoords[0]*pcoords[1]; |
| 593 |
|
derivs[19] = -rm*pcoords[1]; |
| 594 |
|
derivs[20] = rm*sm; |
| 595 |
|
derivs[21] = pcoords[0]*sm; |
| 596 |
|
derivs[22] = pcoords[0]*pcoords[1]; |
| 597 |
|
derivs[23] = rm*pcoords[1]; |
| 598 |
|
} |
| 599 |
|
|
| 600 |
|
/** Evaluate the location inside the cell */ |
| 601 |
|
template <typename TCellInterface> |
| 602 |
|
void |
| 603 |
|
HexahedronCell< TCellInterface > |
| 604 |
LEN |
::EvaluateLocation(int& itkNotUsed(subId),PointsContainer* points, CoordRepType pcoords[3], |
| 605 |
IND |
*******************CoordRepType x[3], CoordRepType *weights) |
| 606 |
|
{ |
| 607 |
|
int i, j; |
| 608 |
|
PointType pt; |
| 609 |
|
|
| 610 |
|
this->InterpolationFunctions(pcoords, weights); |
| 611 |
|
|
| 612 |
|
x[0] = x[1] = x[2] = 0.0; |
| 613 |
|
for (i=0; i<8; i++) |
| 614 |
|
{ |
| 615 |
|
pt = points->GetElement( m_PointIds[i] ); |
| 616 |
|
|
| 617 |
|
for (j=0; j<3; j++) |
| 618 |
|
{ |
| 619 |
|
x[j] += pt[j] * weights[i]; |
| 620 |
|
} |
| 621 |
|
} |
| 622 |
|
} |
| 623 |
|
|
| 624 |
|
|
| 625 |
|
} // end namespace itk |
| 626 |
|
|
| 627 |
|
#endif |
| 628 |
|
|