[vtkusers] vtkScaledTextActor & offscreen

[Berk Geveci]

I can confirm (with a similar linux machine). I can't
explain why though. All the necessary offscreen code
is in Rendering/vtkXOpenGLRenderWindow.{h|cxx}. Maybe
someone who knows Mesa better can take a look at it ?

-Berk

On Tue, 2002-04-09 at 13:49, Randy Heiland wrote:
> Can someone tell me why a vtkScaledTextActor doesn't appear in a (Mesa)
> offscreen rendering (but does for onscreen)?  (VTK4.0, Mesa 4.0, RH7.2)
> 
> Else, can someone confirm/deny?
> 
> thanks,
> --Randy
> 
> Here are simple Python & Tcl scripts:
> 
> -------------------------------------
> from vtk import *
> 
> ren1 = vtkRenderer()
> 
> renWin = vtkRenderWindow()
> renWin.AddRenderer(ren1)
> 
> 
> offscreen = 1
> offscreen = 0
> if offscreen > 0:
>   renWin.SetOffScreenRendering(1)
> else:
>   iren= vtkRenderWindowInteractor()
>   iren.SetRenderWindow(renWin)
> 
> text1Actor = vtkScaledTextActor()
> text1Mapper = vtkTextMapper()
> text1Actor.SetMapper(text1Mapper)
> text1Mapper.SetInput('frame=')
> #text1Mapper.SetFontSize(14)
> text1Actor.GetProperty().SetColor(1.0,1.0,1.0)
> ren1.AddActor2D(text1Actor)
> 
> renWin.Render()
> 
> w2if = vtkWindowToImageFilter()
> w2if.SetInput( renWin )
> pnmWriter = vtkPNMWriter()
> pnmWriter.SetInput(w2if.GetOutput())
> pnmWriter.SetFileName("img1.pnm")
> pnmWriter.Write()
> 
> if offscreen == 0:
>   iren.Start()
> 
> ----------------------------------------
> package require vtk
> package require vtkinteraction
> 
> vtkRenderer ren1
> vtkRenderWindow renWin
>  renWin AddRenderer ren1
> 
> vtkRenderWindowInteractor iren
> #iren SetRenderWindow renWin
> 
> renWin SetOffScreenRendering 1
> #renWin SetOffScreenRendering 0
> 
> vtkScaledTextActor text1Actor
> vtkTextMapper text1Mapper
> text1Actor SetMapper text1Mapper
> text1Mapper SetInput "this is a silly test"
> #text1Mapper SetFontSize(14)
> #[text1Actor GetProperty] SetColor(1.0,1.0,1.0)
> ren1 AddActor2D text1Actor
> 
> renWin Render
> 
> vtkWindowToImageFilter w2if
> w2if SetInput  renWin
> vtkPNMWriter pnmWriter
> pnmWriter SetInput [w2if GetOutput]
> pnmWriter SetFileName "img1.pnm"
> pnmWriter Write
> 
> 
> #iren Initialize
> #iren AddObserver UserEvent {wm deiconify .vtkInteract}
> 
> # prevent the tk window from showing up then start the event loop
> #wm withdraw .
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