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#!/usr/bin/env python
import vtk
from vtk.test import Testing
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
# Create the RenderWindow, Renderer and both Actors
#
ren1 = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren1)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
Scale = 5
lut = vtk.vtkLookupTable()
lut.SetHueRange(0.6, 0)
lut.SetSaturationRange(1.0, 0)
lut.SetValueRange(0.5, 1.0)
demModel = vtk.vtkDEMReader()
demModel.SetFileName(VTK_DATA_ROOT + "/Data/SainteHelens.dem")
demModel.Update()
lo = Scale * demModel.GetElevationBounds()[0]
hi = Scale * demModel.GetElevationBounds()[1]
demActor = vtk.vtkLODActor()
# create a pipeline for each lod mapper
lods = ["4", "8", "16"]
for lod in lods:
exec("shrink" + lod + " = vtk.vtkImageShrink3D()")
eval("shrink" + lod).SetShrinkFactors(int(lod), int(lod), 1)
eval("shrink" + lod).SetInputConnection(demModel.GetOutputPort())
eval("shrink" + lod).AveragingOn()
exec("geom" + lod + " = vtk.vtkImageDataGeometryFilter()")
eval("geom" + lod).SetInputConnection(eval("shrink" + lod).GetOutputPort())
eval("geom" + lod).ReleaseDataFlagOn()
exec("warp" + lod + " = vtk.vtkWarpScalar()")
eval("warp" + lod).SetInputConnection(eval("geom" + lod).GetOutputPort())
eval("warp" + lod).SetNormal(0, 0, 1)
eval("warp" + lod).UseNormalOn()
eval("warp" + lod).SetScaleFactor(Scale)
eval("warp" + lod).ReleaseDataFlagOn()
exec("elevation" + lod + " = vtk.vtkElevationFilter()")
eval("elevation" + lod).SetInputConnection(
eval("warp" + lod).GetOutputPort())
eval("elevation" + lod).SetLowPoint(0, 0, lo)
eval("elevation" + lod).SetHighPoint(0, 0, hi)
eval("elevation" + lod).SetScalarRange(lo, hi)
eval("elevation" + lod).ReleaseDataFlagOn()
exec("toPoly" + lod + " = vtk.vtkCastToConcrete()")
eval("toPoly" + lod).SetInputConnection(
eval("elevation" + lod).GetOutputPort())
exec("normals" + lod + " = vtk.vtkPolyDataNormals()")
eval("normals" + lod).SetInputConnection(
eval("toPoly" + lod).GetOutputPort())
eval("normals" + lod).SetFeatureAngle(60)
eval("normals" + lod).ConsistencyOff()
eval("normals" + lod).SplittingOff()
eval("normals" + lod).ReleaseDataFlagOn()
exec("demMapper" + lod + " = vtk.vtkPolyDataMapper()")
eval("demMapper" + lod).SetInputConnection(
eval("normals" + lod).GetOutputPort())
eval("demMapper" + lod).SetScalarRange(lo, hi)
eval("demMapper" + lod).SetLookupTable(lut)
eval("demMapper" + lod).ImmediateModeRenderingOn()
eval("demMapper" + lod).Update()
demActor.AddLODMapper(eval("demMapper" + lod))
# Add the actors to the renderer, set the background and size
#
ren1.AddActor(demActor)
ren1.SetBackground(.4, .4, .4)
iren.SetDesiredUpdateRate(1)
def TkCheckAbort (object_binding, event_name):
foo = renWin.GetEventPending()
if (foo != 0):
renWin.SetAbortRender(1)
renWin.AddObserver("AbortCheckEvent", TkCheckAbort)
ren1.GetActiveCamera().SetViewUp(0, 0, 1)
ren1.GetActiveCamera().SetPosition(-99900, -21354, 131801)
ren1.GetActiveCamera().SetFocalPoint(41461, 41461, 2815)
ren1.ResetCamera()
ren1.GetActiveCamera().Dolly(1.2)
ren1.ResetCameraClippingRange()
renWin.Render()
#iren.Start()
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