package require vtk
package require vtkinteraction

# Read a field representing unstructured grid and display it (similar to blow.tcl)

# create a reader and write out field daya
vtkUnstructuredGridReader reader
    reader SetFileName "$VTK_DATA_ROOT/Data/blow.vtk"
    reader SetScalarsName "thickness9"
    reader SetVectorsName "displacement9"
vtkDataSetToDataObjectFilter ds2do
    ds2do SetInputConnection [reader GetOutputPort]

# we must be able to write here
if {[catch {set channel [open "UGridField.vtk" "w"]}] == 0 } {
   close $channel

vtkDataObjectWriter write
    write SetInputConnection [ds2do GetOutputPort]
    write SetFileName "UGridField.vtk"
    write Write

# Read the field and convert to unstructured grid.
vtkDataObjectReader dor
    dor SetFileName "UGridField.vtk"
vtkDataObjectToDataSetFilter do2ds
    do2ds SetInputConnection [dor GetOutputPort]
    do2ds SetDataSetTypeToUnstructuredGrid
    do2ds SetPointComponent 0 "Points" 0 
    do2ds SetPointComponent 1 "Points" 1 
    do2ds SetPointComponent 2 "Points" 2 
    do2ds SetCellTypeComponent "CellTypes" 0
    do2ds SetCellConnectivityComponent "Cells" 0
vtkFieldDataToAttributeDataFilter fd2ad
    fd2ad SetInput [do2ds GetUnstructuredGridOutput]
    fd2ad SetInputFieldToDataObjectField
    fd2ad SetOutputAttributeDataToPointData
    fd2ad SetVectorComponent 0 "displacement9" 0 
    fd2ad SetVectorComponent 1 "displacement9" 1 
    fd2ad SetVectorComponent 2 "displacement9" 2 
    fd2ad SetScalarComponent 0 "thickness9" 0 
    
# Now start visualizing
vtkWarpVector warp
    warp SetInput [fd2ad GetUnstructuredGridOutput]

# extract mold from mesh using connectivity
vtkConnectivityFilter connect
    connect SetInputConnection [warp GetOutputPort]
    connect SetExtractionModeToSpecifiedRegions
    connect AddSpecifiedRegion 0
    connect AddSpecifiedRegion 1
vtkDataSetMapper moldMapper
    moldMapper SetInputConnection [connect GetOutputPort]
    moldMapper ScalarVisibilityOff
vtkActor moldActor
    moldActor SetMapper moldMapper
    [moldActor GetProperty] SetColor .2 .2 .2
    [moldActor GetProperty] SetRepresentationToWireframe

# extract parison from mesh using connectivity
vtkConnectivityFilter connect2
    connect2 SetInputConnection [warp GetOutputPort]
    connect2 SetExtractionModeToSpecifiedRegions
    connect2 AddSpecifiedRegion 2
vtkGeometryFilter parison
    parison SetInputConnection [connect2 GetOutputPort]
vtkPolyDataNormals normals2
    normals2 SetInputConnection [parison GetOutputPort]
    normals2 SetFeatureAngle 60
vtkLookupTable lut
    lut SetHueRange 0.0 0.66667
vtkPolyDataMapper parisonMapper
    parisonMapper SetInputConnection [normals2 GetOutputPort]
    parisonMapper SetLookupTable lut
    parisonMapper SetScalarRange 0.12 1.0
vtkActor parisonActor
    parisonActor SetMapper parisonMapper

vtkContourFilter cf
    cf SetInputConnection [connect2 GetOutputPort]
    cf SetValue 0 .5
vtkPolyDataMapper contourMapper
    contourMapper SetInputConnection [cf GetOutputPort]
vtkActor contours
    contours SetMapper contourMapper

# Create graphics stuff
vtkRenderer ren1
vtkRenderWindow renWin
    renWin AddRenderer ren1
vtkRenderWindowInteractor iren
    iren SetRenderWindow renWin

# Add the actors to the renderer, set the background and size
ren1 AddActor moldActor
ren1 AddActor parisonActor
ren1 AddActor contours
ren1 ResetCamera
[ren1 GetActiveCamera] Azimuth 60
[ren1 GetActiveCamera] Roll -90
[ren1 GetActiveCamera] Dolly 2
ren1 ResetCameraClippingRange
ren1 SetBackground 1 1 1
renWin SetSize 375 200

iren Initialize
iren AddObserver UserEvent {wm deiconify .vtkInteract}
if {[info commands "rtExMath"] != ""} { 
    file delete -force "UGridField.vtk"
}
}

# prevent the tk window from showing up then start the event loop
wm withdraw .