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#!/usr/bin/env python
## Program: VMTK
## Module: $RCSfile: vmtkparticletracer.py,v $
## Language: Python
## Date: $Date: 2013/07/09 16:10:27 $
## Version: $Revision: 1.6 $
## Copyright (c) Luca Antiga, David Steinman. All rights reserved.
## See LICENCE file 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.
## Note: this class was contributed by
## Simone Manini
## Orobix Srl
import vtk
import sys
import os
import vtkvmtk
import pypes
vmtkparticletracer = 'vmtkParticleTracer'
class vmtkParticleTracer(pypes.pypeScript):
def __init__(self):
pypes.pypeScript.__init__(self)
self.Mesh = None
self.Source = None
self.Traces = None
self.FirstTimeStep = None
self.LastTimeStep = None
self.IntervalTimeStep = None
self.MinSpeed = 5.0
self.Subdivide = 0
self.SeedTime = 0.0
self.MaximumPropagation = 1E10
self.InitialIntegrationStep = 0.1
self.MinimumIntegrationStep = 0.01
self.MaximumIntegrationStep = 10.0
self.MaximumNumberOfSteps = 1E10
self.VelocityScale = 1.0
self.IntegrationDirectionBoth = 1
self.VectorComponents = 1
self.Periodic = 1
self.Vorticity = 1
self.Component0Prefix = "u_"
self.Component1Prefix = "v_"
self.Component2Prefix = "w_"
self.SetScriptName('vmtkparticletracer')
self.SetScriptDoc('Generate streamlines')
self.SetInputMembers([
['Mesh','i','vtkUnstructuredGrid',1,'','the input mesh','vmtkmeshreader'],
['Source','s','vtkPolyData',1,'','source points', 'vmtksurfacereader'],
['SeedTime','seedtime','float',1,'(0.0,)'],
['MinSpeed','minspeed','float',1,'(0.0,)','lower speed threshold'],
['Subdivide','subdivide','bool',1,'','Subdivide input polydata'],
['MaximumPropagation','maximumpropagation','int',1,'(0,)'],
['InitialIntegrationStep','initialintegrationstep','float',1,'(0.0,)'],
['MinimumIntegrationStep','minimumintegrationstep','float',1,'(0.0,)'],
['MaximumIntegrationStep','maximumintegrationstep','float',1,'(0.0,)'],
['MaximumNumberOfSteps','maximumnumberofsteps','int',1,'(0,)'],
['VelocityScale','velocityscale','float',1,'(0.0,)'],
['IntegrationDirectionBoth','integrationdirectionboth','bool',1,''],
['VectorComponents','vectorcomponents','bool',1,''],
['Periodic','periodic','bool',1,''],
['Vorticity','vorticity','bool',1,''],
['Component0Prefix','component0prefix','str',1,''],
['Component1Prefix','component1prefix','str',1,''],
['Component2Prefix','component2prefix','str',1,''],
['FirstTimeStep','firststep','int',1,'(0.0,)','first timestep'],
['LastTimeStep','laststep','int',1,'(0.0,)','last timestep'],
['IntervalTimeStep','interval','int',1,'(0.0,)','interval time step'],
])
self.SetOutputMembers([
['Traces','o','vtkPolyData',1,'','the output traces','vmtksurfacewriter']
])
def Execute(self):
if (self.Mesh == None):
self.PrintError('Error: no Mesh.')
if (self.Source == None):
self.PrintError('Error: no Source surface.')
if (self.FirstTimeStep == None or self.LastTimeStep == None or self.IntervalTimeStep == None):
timesteps = self.Mesh.GetFieldData().GetArray("timesteps")
if (timesteps == None):
self.PrintError('Error: no Timesteps.')
indexList = []
i = 0
while i < self.Mesh.GetFieldData().GetArray("timesteps").GetNumberOfTuples():
indexList.append(int(timesteps.GetTuple(i)[0]))
i+=1
firstTimeStep = indexList[0]
else:
indexList = range(self.FirstTimeStep,self.LastTimeStep+1,self.IntervalTimeStep)
firstTimeStep = self.FirstTimeStep
indexColumn = vtk.vtkIntArray()
indexColumn.SetName("index")
timeColumn = vtk.vtkDoubleArray()
timeColumn.SetName("time")
time = 0
timeStepsTable = vtk.vtkTable()
timeStepsTable.AddColumn(indexColumn)
timeStepsTable.AddColumn(timeColumn)
for index in indexList:
time+=(1./(len(indexList)-1))
indexColumn.InsertNextValue(index)
timeColumn.InsertNextValue(time)
u = self.Source.GetPointData().GetArray("u")
if u:
v = self.Source.GetPointData().GetArray("v")
w = self.Source.GetPointData().GetArray("w")
else:
u = self.Source.GetPointData().GetArray("u_"+str(firstTimeStep))
v = self.Source.GetPointData().GetArray("v_"+str(firstTimeStep))
w = self.Source.GetPointData().GetArray("w_"+str(firstTimeStep))
speed = vtk.vtkFloatArray()
speed.SetNumberOfComponents(u.GetNumberOfComponents())
speed.SetNumberOfTuples(u.GetNumberOfTuples())
speed.SetName('speed')
i=0
while i<u.GetNumberOfTuples():
speed.InsertTuple1(i, vtk.vtkMath.Norm((u.GetTuple(i)[0],v.GetTuple(i)[0],w.GetTuple(i)[0])))
i+=1
self.Source.GetPointData().AddArray(speed)
if self.Subdivide:
sd = vtk.vtkLinearSubdivisionFilter()
sd.SetInputData(self.Source)
sd.SetNumberOfSubdivisions(1)
sd.Update()
self.Source = sd.GetOutput()
self.Source.GetPointData().SetActiveScalars('speed')
cp = vtk.vtkClipPolyData()
cp.SetInputData(self.Source)
cp.GenerateClipScalarsOff()
cp.SetValue(self.MinSpeed)
cp.Update()
self.Source = cp.GetOutput()
tracer = vtkvmtk.vtkvmtkStaticTemporalStreamTracer()
tracer.SetInputData(self.Mesh)
tracer.SetIntegratorTypeToRungeKutta45()
tracer.SetTimeStepsTable(timeStepsTable)
tracer.SetSeedTime(self.SeedTime)
tracer.SetMaximumPropagation(self.MaximumPropagation)
tracer.SetInitialIntegrationStep(self.InitialIntegrationStep)
tracer.SetMinimumIntegrationStep(self.MinimumIntegrationStep)
tracer.SetMaximumIntegrationStep(self.MaximumIntegrationStep)
tracer.SetMaximumNumberOfSteps(self.MaximumNumberOfSteps)
if self.Vorticity:
tracer.SetComputeVorticity(1)
if self.IntegrationDirectionBoth:
tracer.SetIntegrationDirectionToBoth()
tracer.SetSourceData(self.Source)
tracer.SetVelocityScale(self.VelocityScale)
if self.VectorComponents:
tracer.UseVectorComponentsOn()
tracer.SetComponent0Prefix(self.Component0Prefix)
tracer.SetComponent1Prefix(self.Component1Prefix)
tracer.SetComponent2Prefix(self.Component2Prefix)
if self.Periodic:
tracer.PeriodicOn()
tracer.Update()
self.Traces = tracer.GetOutput()
if __name__=='__main__':
main = pypes.pypeMain()
main.Arguments = sys.argv
main.Execute()
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