VTK  9.3.0
vtkGreedyTerrainDecimation.h
Go to the documentation of this file.
1 // SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
2 // SPDX-License-Identifier: BSD-3-Clause
67 #ifndef vtkGreedyTerrainDecimation_h
68 #define vtkGreedyTerrainDecimation_h
69 
70 #include "vtkFiltersHybridModule.h" // For export macro
71 #include "vtkPolyDataAlgorithm.h"
72 
73 VTK_ABI_NAMESPACE_BEGIN
74 class vtkPriorityQueue;
75 class vtkDataArray;
76 class vtkPointData;
77 class vtkIdList;
78 class vtkDoubleArray;
79 class vtkFloatArray;
80 
81 // PIMPL Encapsulation for STL containers
82 class vtkGreedyTerrainDecimationTerrainInfoType;
83 class vtkGreedyTerrainDecimationPointInfoType;
84 
85 #define VTK_ERROR_NUMBER_OF_TRIANGLES 0
86 #define VTK_ERROR_SPECIFIED_REDUCTION 1
87 #define VTK_ERROR_ABSOLUTE 2
88 #define VTK_ERROR_RELATIVE 3
89 
90 class VTKFILTERSHYBRID_EXPORT vtkGreedyTerrainDecimation : public vtkPolyDataAlgorithm
91 {
92 public:
94  void PrintSelf(ostream& os, vtkIndent indent) override;
95 
100 
102 
108  vtkSetClampMacro(ErrorMeasure, int, VTK_ERROR_NUMBER_OF_TRIANGLES, VTK_ERROR_RELATIVE);
109  vtkGetMacro(ErrorMeasure, int);
111  {
112  this->SetErrorMeasure(VTK_ERROR_NUMBER_OF_TRIANGLES);
113  }
115  {
116  this->SetErrorMeasure(VTK_ERROR_SPECIFIED_REDUCTION);
117  }
118  void SetErrorMeasureToAbsoluteError() { this->SetErrorMeasure(VTK_ERROR_ABSOLUTE); }
119  void SetErrorMeasureToRelativeError() { this->SetErrorMeasure(VTK_ERROR_RELATIVE); }
121 
123 
129  vtkSetClampMacro(NumberOfTriangles, vtkIdType, 2, VTK_ID_MAX);
130  vtkGetMacro(NumberOfTriangles, vtkIdType);
132 
134 
139  vtkSetClampMacro(Reduction, double, 0.0, 1.0);
140  vtkGetMacro(Reduction, double);
142 
144 
149  vtkSetClampMacro(AbsoluteError, double, 0.0, VTK_DOUBLE_MAX);
150  vtkGetMacro(AbsoluteError, double);
152 
154 
160  vtkSetClampMacro(RelativeError, double, 0.0, VTK_DOUBLE_MAX);
161  vtkGetMacro(RelativeError, double);
163 
165 
169  vtkSetMacro(BoundaryVertexDeletion, vtkTypeBool);
170  vtkGetMacro(BoundaryVertexDeletion, vtkTypeBool);
171  vtkBooleanMacro(BoundaryVertexDeletion, vtkTypeBool);
173 
175 
178  vtkSetMacro(ComputeNormals, vtkTypeBool);
179  vtkGetMacro(ComputeNormals, vtkTypeBool);
180  vtkBooleanMacro(ComputeNormals, vtkTypeBool);
182 
183 protected:
186 
189 
192  void ComputePointNormal(int i, int j, float n[3]);
193 
194  // ivars that the API addresses
197  double Reduction;
200  vtkTypeBool BoundaryVertexDeletion; // Can we delete boundary vertices?
201 
202  // Used for convenience
209  double Tolerance;
211  int Dimensions[3];
212  double Origin[3];
213  double Spacing[3];
215  double Length;
216 
217  // Bookkeeping arrays
218  vtkPriorityQueue* TerrainError; // errors for each pt in height field
219  vtkGreedyTerrainDecimationTerrainInfoType* TerrainInfo; // owning triangle for each pt
220  vtkGreedyTerrainDecimationPointInfoType* PointInfo; // map mesh pt id to input pt id
221 
222  // Make a guess at initial allocation
223  void EstimateOutputSize(vtkIdType numInputPts, vtkIdType& numPts, vtkIdType& numTris);
224 
225  // Returns non-zero if the error measure is satisfied.
226  virtual int SatisfiesErrorMeasure(double error);
227 
228  // Insert all the boundary vertices into the TIN
230 
231  // Insert a point into the triangulation; get a point from the triangulation
233  vtkIdType InsertNextPoint(vtkIdType inputPtId, double x[3]);
234  double* GetPoint(vtkIdType id);
235  void GetPoint(vtkIdType id, double x[3]);
236 
237  // Helper functions
238  void GetTerrainPoint(int i, int j, double x[3]);
239  void ComputeImageCoordinates(vtkIdType inputPtId, int ij[2]);
240  int InCircle(double x[3], double x1[3], double x2[3], double x3[3]);
241  vtkIdType FindTriangle(double x[3], vtkIdType ptIds[3], vtkIdType tri, double tol,
242  vtkIdType nei[3], vtkIdList* neighbors, int& status);
243  void CheckEdge(vtkIdType ptId, double x[3], vtkIdType p1, vtkIdType p2, vtkIdType tri, int depth);
244 
245  void UpdateTriangles(vtkIdType meshPtId); // update all points connected to this point
247  void UpdateTriangle(vtkIdType triId, int ij1[2], int ij2[2], int ij3[2], double h[3]);
248 
249  int CharacterizeTriangle(int ij1[2], int ij2[2], int ij[3], int*& min, int*& max, int*& midL,
250  int*& midR, int*& mid, int mid2[2], double h[3], double& hMin, double& hMax, double& hL,
251  double& hR);
252 
253 private:
255  void operator=(const vtkGreedyTerrainDecimation&) = delete;
256 };
257 
258 VTK_ABI_NAMESPACE_END
259 #endif
abstract superclass for arrays of numeric data
Definition: vtkDataArray.h:54
dynamic, self-adjusting array of double
dynamic, self-adjusting array of float
Definition: vtkFloatArray.h:40
reduce height field (represented as image) to reduced TIN
int FillInputPortInformation(int port, vtkInformation *info) override
Fill the input port information objects for this algorithm.
int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *) override
This is called by the superclass.
void ComputeImageCoordinates(vtkIdType inputPtId, int ij[2])
void UpdateTriangle(vtkIdType triId, vtkIdType p1, vtkIdType p2, vtkIdType p3)
void GetTerrainPoint(int i, int j, double x[3])
int CharacterizeTriangle(int ij1[2], int ij2[2], int ij[3], int *&min, int *&max, int *&midL, int *&midR, int *&mid, int mid2[2], double h[3], double &hMin, double &hMax, double &hL, double &hR)
void SetErrorMeasureToNumberOfTriangles()
Specify how to terminate the algorithm: either as an absolute number of triangles,...
vtkGreedyTerrainDecimationTerrainInfoType * TerrainInfo
void ComputePointNormal(int i, int j, float n[3])
void SetErrorMeasureToAbsoluteError()
Specify how to terminate the algorithm: either as an absolute number of triangles,...
void UpdateTriangle(vtkIdType triId, int ij1[2], int ij2[2], int ij3[2], double h[3])
~vtkGreedyTerrainDecimation() override
vtkIdType InsertNextPoint(vtkIdType inputPtId, double x[3])
vtkIdType AddPointToTriangulation(vtkIdType inputPtId)
vtkIdType FindTriangle(double x[3], vtkIdType ptIds[3], vtkIdType tri, double tol, vtkIdType nei[3], vtkIdList *neighbors, int &status)
void PrintSelf(ostream &os, vtkIndent indent) override
Methods invoked by print to print information about the object including superclasses.
vtkGreedyTerrainDecimationPointInfoType * PointInfo
void SetErrorMeasureToRelativeError()
Specify how to terminate the algorithm: either as an absolute number of triangles,...
void GetPoint(vtkIdType id, double x[3])
void SetErrorMeasureToSpecifiedReduction()
Specify how to terminate the algorithm: either as an absolute number of triangles,...
static vtkGreedyTerrainDecimation * New()
Instantiate the class.
void EstimateOutputSize(vtkIdType numInputPts, vtkIdType &numPts, vtkIdType &numTris)
virtual int SatisfiesErrorMeasure(double error)
int InCircle(double x[3], double x1[3], double x2[3], double x3[3])
void CheckEdge(vtkIdType ptId, double x[3], vtkIdType p1, vtkIdType p2, vtkIdType tri, int depth)
void UpdateTriangles(vtkIdType meshPtId)
double * GetPoint(vtkIdType id)
list of point or cell ids
Definition: vtkIdList.h:32
a simple class to control print indentation
Definition: vtkIndent.h:38
Store zero or more vtkInformation instances.
Store vtkAlgorithm input/output information.
represent and manipulate point attribute data
Definition: vtkPointData.h:39
Superclass for algorithms that produce only polydata as output.
concrete dataset represents vertices, lines, polygons, and triangle strips
Definition: vtkPolyData.h:89
a list of ids arranged in priority order
Computes the portion of a dataset which is inside a selection.
@ info
Definition: vtkX3D.h:376
@ port
Definition: vtkX3D.h:447
int vtkTypeBool
Definition: vtkABI.h:64
#define VTK_ERROR_SPECIFIED_REDUCTION
#define VTK_ERROR_ABSOLUTE
#define VTK_ERROR_RELATIVE
#define VTK_ERROR_NUMBER_OF_TRIANGLES
int vtkIdType
Definition: vtkType.h:315
#define VTK_ID_MAX
Definition: vtkType.h:319
#define VTK_DOUBLE_MAX
Definition: vtkType.h:154
#define max(a, b)