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package require vtk
package require vtkinteraction
# Create the RenderWindow, Renderer and both Actors
#
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
set Scale 5
vtkLookupTable lut
lut SetHueRange 0.6 0
lut SetSaturationRange 1.0 0
lut SetValueRange 0.5 1.0
vtkDEMReader demModel
demModel SetFileName "$VTK_DATA_ROOT/Data/SainteHelens.dem"
demModel Update
catch { demModel Print }
set lo [expr $Scale * [lindex [demModel GetElevationBounds] 0]]
set hi [expr $Scale * [lindex [demModel GetElevationBounds] 1]]
vtkLODActor demActor
# create a pipeline for each lod mapper
set lods "4 8 16"
foreach lod $lods {
vtkImageShrink3D shrink$lod
shrink$lod SetShrinkFactors [expr int($lod)] [expr int($lod)] 1
shrink$lod SetInputConnection [demModel GetOutputPort]
shrink$lod AveragingOn
vtkImageDataGeometryFilter geom$lod
geom$lod SetInputConnection [shrink$lod GetOutputPort]
geom$lod ReleaseDataFlagOn
vtkWarpScalar warp$lod
warp$lod SetInputConnection [geom$lod GetOutputPort]
warp$lod SetNormal 0 0 1
warp$lod UseNormalOn
warp$lod SetScaleFactor $Scale
warp$lod ReleaseDataFlagOn
vtkElevationFilter elevation$lod
elevation$lod SetInputConnection [warp$lod GetOutputPort]
elevation$lod SetLowPoint 0 0 $lo
elevation$lod SetHighPoint 0 0 $hi
eval elevation$lod SetScalarRange $lo $hi
elevation$lod ReleaseDataFlagOn
vtkCastToConcrete toPoly$lod
toPoly$lod SetInputConnection [elevation$lod GetOutputPort]
vtkPolyDataNormals normals$lod
normals$lod SetInputConnection [toPoly$lod GetOutputPort]
normals$lod SetFeatureAngle 60
normals$lod ConsistencyOff
normals$lod SplittingOff
normals$lod ReleaseDataFlagOn
vtkPolyDataMapper demMapper$lod
demMapper$lod SetInputConnection [normals$lod GetOutputPort]
eval demMapper$lod SetScalarRange $lo $hi
demMapper$lod SetLookupTable lut
demMapper$lod ImmediateModeRenderingOn
demMapper$lod Update
demActor AddLODMapper demMapper$lod
}
# Add the actors to the renderer, set the background and size
#
ren1 AddActor demActor
ren1 SetBackground .4 .4 .4
iren AddObserver UserEvent {wm deiconify .vtkInteract}
iren SetDesiredUpdateRate 1
wm withdraw .
proc TkCheckAbort {} {
set foo [renWin GetEventPending]
if {$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
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