#!/usr/bin/env python
from vtkmodules.vtkCommonExecutionModel import (
    vtkCompositeDataPipeline,
    vtkStreamingDemandDrivenPipeline,
)
from vtkmodules.vtkFiltersGeometry import vtkGeometryFilter
from vtkmodules.vtkIOEnSight import vtkGenericEnSightReader
from vtkmodules.vtkRenderingCore import (
    vtkActor,
    vtkHierarchicalPolyDataMapper,
    vtkRenderWindow,
    vtkRenderWindowInteractor,
    vtkRenderer,
)
import vtkmodules.vtkInteractionStyle
import vtkmodules.vtkRenderingFreeType
import vtkmodules.vtkRenderingOpenGL2
from vtkmodules.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()

# create a rendering window and renderer
ren1 = vtkRenderer()
renWin = vtkRenderWindow()
renWin.AddRenderer(ren1)
renWin.StereoCapableWindowOn()
iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
reader = vtkGenericEnSightReader()
# Make sure all algorithms use the composite data pipeline
cdp = vtkCompositeDataPipeline()
reader.SetDefaultExecutivePrototype(cdp)
reader.SetCaseFileName(VTK_DATA_ROOT + "/Data/EnSight/elements-bin.case")
reader.UpdateInformation()
reader.GetOutputInformation(0).Set(vtkStreamingDemandDrivenPipeline.UPDATE_TIME_STEP(), 0.1)
geom0 = vtkGeometryFilter()
geom0.SetInputConnection(reader.GetOutputPort())
mapper0 = vtkHierarchicalPolyDataMapper()
mapper0.SetInputConnection(geom0.GetOutputPort())
mapper0.SetColorModeToMapScalars()
mapper0.SetScalarModeToUsePointFieldData()
mapper0.ColorByArrayComponent("pointTensors",0)
mapper0.SetScalarRange(0,112)
actor0 = vtkActor()
actor0.SetMapper(mapper0)
# assign our actor to the renderer
ren1.AddActor(actor0)
# enable user interface interactor
iren.Initialize()
# prevent the tk window from showing up then start the event loop
reader.SetDefaultExecutivePrototype(None)
# --- end of script --