def __init__(self, module_manager):
SimpleVTKClassModuleBase.__init__(
self, module_manager,
vtk.vtkGreedyTerrainDecimation(), 'Processing.',
('vtkImageData',), ('vtkPolyData',),
replaceDoc=True,
inputFunctions=None, outputFunctions=None)
def __init__(self, module_manager):
SimpleVTKClassModuleBase.__init__(self,
module_manager,
vtk.vtkGreedyTerrainDecimation(),
'Processing.', ('vtkImageData', ),
('vtkPolyData', ),
replaceDoc=True,
inputFunctions=None,
outputFunctions=None)
def decimate(zarray, corrected_absolute_error):
row_size, col_size = zarray.shape
number_of_elevation_entries = zarray.size
vectorized_elevations = np.reshape(zarray, (number_of_elevation_entries, 1))
vtk_array = numpy_to_vtk(vectorized_elevations, deep=True,
array_type=VTK_FLOAT)
image = vtkImageData()
image.SetDimensions(col_size, row_size, 1)
image.AllocateScalars(vtk_array.GetDataType(), 4)
image.GetPointData().GetScalars().DeepCopy(vtk_array)
deci = vtkGreedyTerrainDecimation()
deci.SetInputData(image)
deci.BoundaryVertexDeletionOn()
deci.SetErrorMeasureToAbsoluteError()
deci.SetAbsoluteError(corrected_absolute_error)
deci.Update()
return deci
from vtk.test import Testing
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
lut = vtk.vtkLookupTable()
lut.SetHueRange(0.6, 0)
lut.SetSaturationRange(1.0, 0)
lut.SetValueRange(0.5, 1.0)
# Read the data: a height field results
demReader = vtk.vtkDEMReader()
demReader.SetFileName("" + str(VTK_DATA_ROOT) + "/Data/SainteHelens.dem")
demReader.Update()
lo = lindex(demReader.GetOutput().GetScalarRange(), 0)
hi = lindex(demReader.GetOutput().GetScalarRange(), 1)
# Decimate the terrain
deci = vtk.vtkGreedyTerrainDecimation()
deci.SetInputConnection(demReader.GetOutputPort())
deci.BoundaryVertexDeletionOn()
# deci SetErrorMeasureToSpecifiedReduction
# deci SetReduction 0.95
deci.SetErrorMeasureToNumberOfTriangles()
deci.SetNumberOfTriangles(5000)
# deci SetErrorMeasureToAbsoluteError
# deci SetAbsoluteError 25.0
# deci SetErrorMeasureToRelativeError
# deci SetAbsoluteError 0.01
normals = vtk.vtkPolyDataNormals()
normals.SetInputConnection(deci.GetOutputPort())
normals.SetFeatureAngle(60)
normals.ConsistencyOn()
normals.SplittingOff()
lut = vtk.vtkLookupTable() lut.SetHueRange(0.6, 0) lut.SetSaturationRange(1.0, 0) lut.SetValueRange(0.5, 1.0) # Read the data: a height field results demReader = vtk.vtkDEMReader() demReader.SetFileName(VTK_DATA_ROOT + "/Data/SainteHelens.dem") demReader.Update() lo = demReader.GetOutput().GetScalarRange()[0] hi = demReader.GetOutput().GetScalarRange()[1] # Decimate the terrain deci = vtk.vtkGreedyTerrainDecimation() deci.SetInputConnection(demReader.GetOutputPort()) deci.BoundaryVertexDeletionOn() # deci.SetErrorMeasureToSpecifiedReduction() # deci.SetReduction(0.95) deci.SetErrorMeasureToNumberOfTriangles() deci.SetNumberOfTriangles(5000) # deci.SetErrorMeasureToAbsoluteError() # deci.SetAbsoluteError(25.0) # deci.SetErrorMeasureToRelativeError() # deci.SetAbsoluteError(0.01) normals = vtk.vtkPolyDataNormals() normals.SetInputConnection(deci.GetOutputPort()) normals.SetFeatureAngle(60) normals.ConsistencyOn()