[vtk-developers] gradient backgrounds bug?

[Dean Inglis]

thanks for the quick fix!

Dean


Subject: Re: [vtk-developers] gradient backgrounds bug?

I checked in the fix for this. One issue was that I had to ensure textures
were disabled while drawing the gradient. The other is that
Clear() was being called while picking, causing the gradient quad to
register as a "hit". Thanks, Francois!

Jeff

On Mon, Apr 14, 2008 at 9:30 PM, Dean Inglis <dean.inglis at sympatico.ca>
wrote:
>
>  Ive been trying out the new gradient backgrounds  which are a great 
> addition to vtk.  However, Ive  come across a few pipelines where the 
> gradient  background does not work and in some cases  interferes with 
> event processing.  Attached is  a tcl script to test 
> vtkImageOrthoPlanes: it  makes use of two renderers.  If you 
> un-comment  one or both lines where the renderers turn on  the 
> gradient background and try interacting with  the orthoplanes you will 
> see some odd behaviour.
>  See tcl script below and comments.  I have no idea  how to fix this 
> since I never do opengl programming,  and this behaviour may happen 
> with other pipeline  scenarios.
>
>  Dean
>
>
>
>  package require vtk
>  package require vtkinteraction
>
>   vtkVolume16Reader v16
>   v16 SetDataDimensions 64 64
>   v16 SetDataByteOrderToLittleEndian
>   v16 SetImageRange 1 93
>   v16 SetDataSpacing 3.2 3.2 1.5
>   v16 SetFilePrefix "d:/Developer/Sources/VTKData/Data/headsq/quarter"
>   v16 ReleaseDataFlagOn
>   v16 SetDataMask 0x7fff
>   v16 Update
>
>   vtkOutlineFilter outline
>     outline SetInputConnection [v16 GetOutputPort ]
>
>   vtkPolyDataMapper outlineMapper
>     outlineMapper SetInputConnection [outline GetOutputPort ]
>
>   vtkActor outlineActor
>     outlineActor SetMapper outlineMapper
>
>   vtkRenderer ren1
>   vtkRenderer ren2
>
>   vtkRenderWindow renWin
>     renWin AddRenderer ren2
>     renWin AddRenderer ren1
>
>   vtkRenderWindowInteractor iren
>     iren SetRenderWindow renWin
>
>   vtkPropPicker picker
>
>   vtkProperty ipwProp
>    # assign default props to the ipw's texture plane actor
>
>   vtkImagePlaneWidget planeWidgetX
>     planeWidgetX SetInteractor iren
>     planeWidgetX SetKeyPressActivationValue 'x'
>     planeWidgetX SetPicker picker
>     planeWidgetX RestrictPlaneToVolumeOn
>     [planeWidgetX GetPlaneProperty ] SetColor 1 0 0
>     planeWidgetX SetTexturePlaneProperty ipwProp
>     planeWidgetX TextureInterpolateOff
>     planeWidgetX SetResliceInterpolateToNearestNeighbour
>     planeWidgetX SetInput [v16 GetOutput ]
>     planeWidgetX SetPlaneOrientationToXAxes
>     planeWidgetX SetSliceIndex 32
>     planeWidgetX DisplayTextOn
>     planeWidgetX On
>     planeWidgetX InteractionOff
>     planeWidgetX InteractionOn
>
>   vtkImagePlaneWidget planeWidgetY
>     planeWidgetY SetInteractor iren
>     planeWidgetY SetKeyPressActivationValue 'y'
>     planeWidgetY SetPicker picker
>     [planeWidgetY GetPlaneProperty] SetColor 1 1 0
>     planeWidgetY SetTexturePlaneProperty ipwProp
>     planeWidgetY TextureInterpolateOn
>     planeWidgetY SetResliceInterpolateToLinear
>     planeWidgetY SetInput [v16 GetOutput ]
>     planeWidgetY SetPlaneOrientationToYAxes
>     planeWidgetY SetSlicePosition 102.4
>     planeWidgetY SetLookupTable  [planeWidgetX GetLookupTable ]
>     planeWidgetY DisplayTextOff
>     planeWidgetY UpdatePlacement
>     planeWidgetY On
>
>   vtkImagePlaneWidget planeWidgetZ
>     planeWidgetZ SetInteractor iren
>     planeWidgetZ SetKeyPressActivationValue 'z'
>     planeWidgetZ SetPicker picker
>     [planeWidgetZ GetPlaneProperty ] SetColor 0 0 1
>     planeWidgetZ SetTexturePlaneProperty ipwProp
>     planeWidgetZ TextureInterpolateOn
>     planeWidgetZ SetResliceInterpolateToCubic
>     planeWidgetZ SetInput [v16 GetOutput ]
>     planeWidgetZ SetPlaneOrientationToZAxes
>     planeWidgetZ SetSliceIndex 25
>     planeWidgetZ SetLookupTable [ planeWidgetX GetLookupTable ]
>     planeWidgetZ DisplayTextOn
>     planeWidgetZ On
>
>   vtkImageOrthoPlanes orthoPlanes
>     orthoPlanes SetPlane 0 planeWidgetX
>     orthoPlanes SetPlane 1 planeWidgetY
>     orthoPlanes SetPlane 2 planeWidgetZ
>     orthoPlanes ResetPlanes
>
>   #set wl [planeWidgetZ GetWindowLevel ]
>
>   #  Add a 2D image to test the GetReslice method
>   #
>   vtkImageMapToColors colorMap
>     colorMap PassAlphaToOutputOff
>     colorMap SetActiveComponent 0
>     colorMap SetOutputFormatToLuminance
>     colorMap SetInput [planeWidgetZ GetResliceOutput ]
>     colorMap SetLookupTable [planeWidgetX GetLookupTable ]
>
>   vtkImageActor imageActor
>     imageActor PickableOff
>     imageActor SetInput [colorMap GetOutput ]
>
>   #  Add the actors
>   #
>   ren1 AddActor outlineActor
>   ren2 AddActor imageActor
>
>   ren1 SetBackground 0.1  0.1  0.2
>   ren1 SetBackground2 1  0.1  0.2
>
>  #----------------------------------------------------------
>  # if the renderer has its gradientbackground  # turn on, interaction 
> with the image plane widgets  # is not possible  #
>   #ren1 GradientBackgroundOn
>
>  # if left off, interaction is possible, but clicking  # one of the 
> widgets will toggle the gradient background  # in the second renderer  
> #
>   ren2 SetBackground 0.2  0.1  0.2
>   ren2 SetBackground2 1  0.1  0.2
>   ren2 GradientBackgroundOn
>
>   renWin SetSize  600 350
>
>   ren1 SetViewport 0 0 0.58333 1
>   ren2 SetViewport 0.58333 0 1 1
>
>  # render the image
>  #
>  iren AddObserver UserEvent {wm deiconify .vtkInteract}  iren 
> Initialize
>
>  # prevent the tk window from showing up then start the event loop  wm 
> withdraw .
>
>  _______________________________________________
>  vtk-developers mailing list
>  vtk-developers at vtk.org
>  http://www.vtk.org/mailman/listinfo/vtk-developers
>



--
Jeff Baumes, Ph.D.
R&D Engineer, Kitware Inc.
(518) 371-3971 x132
jeff.baumes at kitware.com
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