[vtkusers] vtkImageMapper and vtkPolyDataMapper

[Alexander Fiksel]

For some reason, the vtkImageMapper prevents  vtkPolyDataMapper to be
displayed on Windows XP computers. 
Here is the test code
********************************
package require vtk
package require vtkinteraction
package require vtktesting
vtkImageEllipsoidSource ellipse
vtkImageMapper mapImage
	mapImage SetInput [ellipse GetOutput]
	mapImage SetColorWindow 255
	mapImage SetColorLevel 127.5
vtkActor2D img
	img SetMapper mapImage 

// This line shows up on Windows 2000, but doesn't appear on XP
vtkLineSource line
	line SetPoint1 0 0 0
	line SetPoint2 100 100 0
vtkPolyDataMapper2D lineMapper
	lineMapper SetInput [ line GetOutput]
vtkActor2D lineActor
	lineActor SetMapper lineMapper

vtkRenderer ren1
	ren1 AddActor2D lineActor
	ren1 AddActor2D img
vtkRenderWindow renWin
	renWin AddRenderer ren1
vtkRenderWindowInteractor iren
	iren SetRenderWindow renWin

iren AddObserver UserEvent {wm deiconify .vtkInteract} renWin Render
iren Initialize wm withdraw .
******************************

On Windows 2000 the line shows just fine. On Windows XP the line is
absent. If I remove the image actor, the line becomes visible. Any ideas
why?

Alex