[vtkusers] Rendering two isosurfaces (vtkVolumeRayCastIsosurfaceFunction)

[Greg051]

Hello, 

I try to render two different isosurfaces values but 
it does not work as expected. 

Is there a way to render the two isosurfaces in the same renderer ?

Please look at the tcl code below and the attached image.

Is there a way to add transparency to the rendering ?
http://vtk.1045678.n5.nabble.com/file/n3312127/IsoSurfaces.jpg 

#Filename: TestRayCastIsosurface.tcl

package require vtk
package require vtkinteraction

# create pipeline

vtkVolume16Reader v16
  v16 SetDataDimensions 64 64
  [v16 GetOutput] SetOrigin 0.0 0.0 0.0
  v16 SetDataByteOrderToLittleEndian
  v16 SetFilePrefix "$VTK_DATA_ROOT/Data/headsq/quarter"
  v16 SetImageRange 1 93
  v16 SetDataSpacing 3.2 3.2 1.5

# first actor

vtkColorTransferFunction constColorTransferFunc
		constColorTransferFunc RemoveAllPoints
		constColorTransferFunc AddRGBPoint 0.0   1.0 0.0 0.0
		constColorTransferFunc AddRGBPoint 255.0 1.0 0.0 0.0

vtkVolumeProperty	volumeProperty
		volumeProperty SetColor constColorTransferFunc
		volumeProperty ShadeOn
		 volumeProperty SetInterpolationType 1

vtkVolumeRayCastIsosurfaceFunction isosurfaceFunc
		isosurfaceFunc SetIsoValue 127

vtkVolumeRayCastMapper volumeRayCastMapper
		volumeRayCastMapper SetInput [v16 GetOutput]
		volumeRayCastMapper SetVolumeRayCastFunction isosurfaceFunc

vtkVolume actor
		actor SetMapper volumeRayCastMapper
		actor SetProperty volumeProperty

# second actor

vtkColorTransferFunction constColorTransferFunc2
		constColorTransferFunc2 RemoveAllPoints
		constColorTransferFunc2 AddRGBPoint 0.0   0.0 0.0 1.0
		constColorTransferFunc2 AddRGBPoint 255.0 0.0 0.0 1.0

vtkVolumeProperty	volumeProperty2
		volumeProperty2 SetColor constColorTransferFunc2
		volumeProperty2 ShadeOn
		volumeProperty2 SetInterpolationType 1

vtkVolumeRayCastIsosurfaceFunction isosurfaceFunc2
		isosurfaceFunc2 SetIsoValue 30

vtkVolumeRayCastMapper volumeRayCastMapper2
		volumeRayCastMapper2 SetInput [v16 GetOutput]
		volumeRayCastMapper2 SetVolumeRayCastFunction isosurfaceFunc2

vtkVolume actor2
		actor2 SetMapper volumeRayCastMapper2
		actor2 SetProperty volumeProperty2


vtkRenderer ren1
vtkRenderWindow renWin
    renWin AddRenderer ren1
    
vtkRenderWindowInteractor iren
    iren SetRenderWindow renWin
    [iren GetInteractorStyle] SetCurrentStyleToTrackballCamera
vtkCamera camera
    ren1 SetActiveCamera camera

ren1 AddActor actor
ren1 AddActor actor2
ren1 SetBackground 1 1 1

renWin SetSize 400 400

# render the image
#
iren AddObserver UserEvent {wm deiconify .vtkInteract}
ren1 ResetCamera
[ren1 GetActiveCamera] Zoom 1.0
renWin Render

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

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