saving snaps iteratively with for loop in Paraview

Goal:

read data 1 and slice, then save pressure, velocity contours, close data, then do loop for the aforementioned steps.

****************************************************************

#### import the simple module from the paraview
from paraview.simple import *
#### disable automatic camera reset on 'Show'
paraview.simple._DisableFirstRenderCameraReset()

for Num in range(36,47):
    # create a new 'EnSight Reader' and assign it to a variable, 'transientcase'
    transientcase = EnSightReader(CaseFileName='/home/kaiming/Documents/ZJU_Projects/Jet/data/transient_%i.case' %(Num+1))
    transientcase.PointArrays = [ 'density','v', 'pressure', 'temperature']

# get active view
    renderView1 = GetActiveViewOrCreate('RenderView')
    # set a specific view size
    renderView1.ViewSize = [1022, 837]

# get color transfer function/color map for 'density'
    densityLUT = GetColorTransferFunction('density')
    densityLUT.LockDataRange = 1

# get opacity transfer function/opacity map for 'density'
    densityPWF = GetOpacityTransferFunction('density')

# show data in view
    transientcaseDisplay = Show(transientcase, renderView1)
    # trace defaults for the display properties.
    transientcaseDisplay.ColorArrayName = ['POINTS', 'density']
    transientcaseDisplay.LookupTable = densityLUT
    transientcaseDisplay.GlyphType = 'Arrow'
    transientcaseDisplay.ScalarOpacityUnitDistance = 0.0016420380639339577

# reset view to fit data
    renderView1.ResetCamera()

# show color bar/color legend
    transientcaseDisplay.SetScalarBarVisibility(renderView1, False)

# get opacity transfer function/opacity map for 'density'
    densityPWF = GetOpacityTransferFunction('density')

# reset view to fit data
    renderView1.ResetCamera()

#################
    ## slice
    ################
    # create a new 'Slice'
    slice1 = Slice(Input=transientcase)
    slice1.SliceType = 'Plane'
    slice1.SliceOffsetValues = [0.0]

# init the 'Plane' selected for 'SliceType'
    slice1.SliceType.Origin = [-0.21849990739250558, 0.0, 0.0]

# Properties modified on slice1.SliceType
    slice1.SliceType.Origin = [0.0, 0.0, 0.0]
    slice1.SliceType.Normal = [0.0, 0.0, 1.0]

# show data in view
    slice1Display = Show(slice1, renderView1)
    # trace defaults for the display properties.
    slice1Display.ColorArrayName = ['POINTS', 'density']
    slice1Display.LookupTable = densityLUT
    slice1Display.GlyphType = 'Arrow'

# hide data in view
    Hide(transientcase, renderView1)

# show color bar/color legend
    slice1Display.SetScalarBarVisibility(renderView1, True)

# set active source
    SetActiveSource(transientcase)

# reset view to fit data
    renderView1.ResetCamera()

# current camera placement for renderView1
    renderView1.CameraPosition = [-0.3656950276430585, -0.000908563692513454, 0.21027127790890924]
    renderView1.CameraFocalPoint = [-0.3656950276430585, -0.000908563692513454, 0.0]
    renderView1.CameraParallelScale = 0.25006857916835856

# *****************
    # change legend layout, and its font color, position
    # *****************

# get color legend for 'densityLUT' in view 'renderView1'
    densityLUTColorBar = GetScalarBar(densityLUT, renderView1)

# Properties modified on densityLUTColorBar
    densityLUTColorBar.AutoOrient = 0
    densityLUTColorBar.RangeLabelFormat = '%.2f'
    ## legend orientation
    densityLUTColorBar.Orientation = 'Horizontal'

## legend normalized position
    densityLUTColorBar.Position = [0.3, 0.2]

# change label color to 'black'
    densityLUTColorBar.LabelColor = [1.0, 1.0, 1.0]

#  change titile color to 'black'
    densityLUTColorBar.TitleColor = [1.0, 1.0, 1.0]
    # ***************

# set Background color as 'White'
    renderView1.Background =[1,1,1]

# get layout
    viewLayout1 = GetLayout()
        # set a specific view size
    renderView1.ViewSize = [1022, 837]

# current camera placement for renderView1
    renderView1.CameraPosition = [-0.3656950276430585, -0.000908563692513454, 0.21027127790890924]
    renderView1.CameraFocalPoint = [-0.3656950276430585, -0.000908563692513454, 0.0]
    renderView1.CameraParallelScale = 0.25006857916835856

# save screenshot
    SaveScreenshot('/home/kaiming/Documents/ZJU_Projects/Jet/paraview/tem/d_%s.png' %(Num+1), layout=viewLayout1, magnification=1, quality=100)

#################
    # pressure contour
    ##################

# show color bar/color legend
    slice1Display.SetScalarBarVisibility(renderView1, False)

# set active source
    SetActiveSource(slice1)

# set scalar coloring
    ColorBy(slice1Display, ('POINTS', 'pressure'))

# rescale color and/or opacity maps used to include current data range
    slice1Display.RescaleTransferFunctionToDataRange(True)

# show color bar/color legend
    slice1Display.SetScalarBarVisibility(renderView1, True)

# get color transfer function/color map for 'pressure'

pressureLUT = GetColorTransferFunction('pressure')
    pressureLUT.LockDataRange = 1

# get opacity transfer function/opacity map for 'pressure'
    pressurePWF = GetOpacityTransferFunction('pressure')

# set active source
    SetActiveSource(transientcase)
    # *****************
    # change legend layout, and its font color, position
    # *****************

# get color legend for 'pressureLUT' in view 'renderView1'
    pressureLUTColorBar = GetScalarBar(pressureLUT, renderView1)

# Properties modified on vLUTColorBar
    pressureLUTColorBar.AutoOrient = 0
    pressureLUTColorBar.RangeLabelFormat = '%.2f'
    ## legend orientation
    pressureLUTColorBar.Orientation = 'Horizontal'

## legend normalized position
    pressureLUTColorBar.Position = [0.3, 0.2]

# change label color to 'black'
    pressureLUTColorBar.LabelColor = [1.0, 1.0, 1.0]

#  change titile color to 'black'
    pressureLUTColorBar.TitleColor = [1.0, 1.0, 1.0]
    # ***************

# current camera placement for renderView1
    # current camera placement for renderView1
    renderView1.CameraPosition = [-0.3656950276430585, -0.000908563692513454, 0.21027125790890924]
    renderView1.CameraFocalPoint = [-0.3656950276430585, -0.000908563692513454, 0.0]
    renderView1.CameraParallelScale = 0.25006857916835856

# save screenshot
    SaveScreenshot('/home/kaiming/Documents/ZJU_Projects/Jet/paraview/tem/p_%s.png' %(Num+1), layout=viewLayout1, magnification=1, quality=100)

######################
    # #temperature contour
    ######################

# show color bar/color legend
    slice1Display.SetScalarBarVisibility(renderView1, False)

# set active source
    SetActiveSource(slice1)

# set scalar coloring
    ColorBy(slice1Display, ('POINTS', 'temperature'))

# rescale color and/or opacity maps used to include current data range
    slice1Display.RescaleTransferFunctionToDataRange(True)

# show color bar/color legend
    slice1Display.SetScalarBarVisibility(renderView1, True)

# get color transfer function/color map for 'termperature'

temperatureLUT = GetColorTransferFunction('temperature')
    temperatureLUT.LockDataRange = 1

# get opacity transfer function/opacity map for 'temperature'
    temperaturePWF = GetOpacityTransferFunction('temperature')

# ******
    # legend layout, and its font color, position
    # *****

temperatureLUTColorBar = GetScalarBar(temperatureLUT, renderView1)

# Properties modified on vLUTColorBar

temperatureLUTColorBar.AutoOrient = 0
    temperatureLUTColorBar.RangeLabelFormat = '%.2f'
    ## legend orientation
    temperatureLUTColorBar.Orientation = 'Horizontal'

## legend normalized position
    temperatureLUTColorBar.Position = [0.3, 0.2]

# label color to 'black'
    temperatureLUTColorBar.LabelColor = [1.0, 1.0, 1.0]

#  change 'titile' color to 'black'
    temperatureLUTColorBar.TitleColor = [1.0, 1.0, 1.0]
    # *****************

# set active source
    SetActiveSource(transientcase)

# current camera placement for renderView1
    # current camera placement for renderView1
    renderView1.CameraPosition = [-0.3656950276430585, -0.000908563692513454, 0.21027127790890924]
    renderView1.CameraFocalPoint = [-0.3656950276430585, -0.000908563692513454, 0.0]
    renderView1.CameraParallelScale = 0.25006857917835856

# save screenshot
    SaveScreenshot('/home/kaiming/Documents/ZJU_Projects/Jet/paraview/tem/t_%s.png' %(Num+1), layout=viewLayout1, magnification=1, quality=100)

# *****************
    #  Velocity
    # ****************

# show color legend
    slice1Display.SetScalarBarVisibility(renderView1, False)

# set active source
    SetActiveSource(slice1)

# set scalar coloring
    ColorBy(slice1Display, ('POINTS', 'v'))

# rescale color and/or opacity maps used to include current data range
    slice1Display.RescaleTransferFunctionToDataRange(True)

# show color bar/color legend
    slice1Display.SetScalarBarVisibility(renderView1, True)

# get color transfer function/color map for 'v'

vLUT = GetColorTransferFunction('v')
    vLUT.LockDataRange = 1

# get opacity transfer function/opacity map for 'v'
    vPWF = GetOpacityTransferFunction('v')

# *****************
    # change legend layout, and its font color, position
    # *****************

# get color legend for 'densityLUT' in view 'renderView1'
    vLUTColorBar = GetScalarBar(vLUT, renderView1)

# Properties modified on vLUTColorBar
    vLUTColorBar.AutoOrient = 0
    vLUTColorBar.RangeLabelFormat = '%.2f'
    ## legend orientation
    vLUTColorBar.Orientation = 'Horizontal'

## legend normalized position
    vLUTColorBar.Position = [0.3, 0.2]

# change label color to 'black'
    vLUTColorBar.LabelColor = [1.0, 1.0, 1.0]

#  change titile color to 'black'
    vLUTColorBar.TitleColor = [1.0, 1.0, 1.0]
    # ***************

# set active source
    SetActiveSource(transientcase)

# current camera placement for renderView1
    # current camera placement for renderView1
    renderView1.CameraPosition = [-0.3656950276430585, -0.000908563692513454, 0.21027125790890924]
    renderView1.CameraFocalPoint = [-0.3656950276430585, -0.000908563692513454, 0.0]
    renderView1.CameraParallelScale = 0.25006857916835856

# save screenshot
    SaveScreenshot('/home/kaiming/Documents/ZJU_Projects/Jet/paraview/tem/v_%s.png' %(Num+1), layout=viewLayout1, magnification=1, quality=100)

#### saving camera placements for all active views

# show color bar/color legend
    slice1Display.SetScalarBarVisibility(renderView1, False)
    # current camera placement for renderView1
    renderView1.CameraPosition = [-0.3656950276430585, -0.000908563692513454, 0.21027127790890924]
    renderView1.CameraFocalPoint = [-0.3656950276430585, -0.000908563692513454, 0.0]
    renderView1.CameraParallelScale = 0.25006857916835856
        Disconnect()
        Connect()
    #### uncomment the following to render all views
    # RenderAllViews()
    # alternatively, if you want to write images, you can use SaveScreenshot(...).