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IDProjectCategoryView StatusDate SubmittedLast Update
0003130VTK(No Category)public2006-04-14 11:332012-12-12 12:04
ReporterMathieu Malaterre 
Assigned ToDavid Gobbi 
PrioritylowSeverityminorReproducibilityalways
StatusclosedResolutionfixed 
PlatformOSOS Version
Product Version 
Target VersionFixed in Version 
Summary0003130: vtkImplicitFunctionToImageStencil MTime
DescriptionThe vtkImplicitFunctionToImageStencil does not check the MTime of the
input ImplicitFunction, that is why the stencil doesn't update. Since
a vtkImplicitFunction isn't a vtkDataObject, the VTK pipeline mechanism
doesn't automatically take care of the updating.

Conversely, the vtkPolyDataToImageStencil is a true VTK filter that
has a vtkDataObject as both input and output, and the pipeline behaves as
expected.

The vtkImplicitFunctionToImageStencil works by evaluating the
ImplicitFunction at every voxel within the UpdateExtent of the ImageData
that is being stenciled, which is fairly inefficient.

The vtkPolyDataToImageStencil works by looking at where the raster lines
of the image (i.e. lines of constant z,y) intersect the PolyData,
and hence is very efficient as long as the PolyData is not too complex.


vtkPolyData spoly
vtkPoints spoints

vtkImplicitSelectionLoop loop
  loop SetLoop spoints
  loop SetNormal 1 0 0
  loop AutomaticNormalGenerationOn

vtkImplicitFunctionToImageStencil if2is
  if2is SetInput loop

vtkImageStencil stencil
    stencil SetInput [extract GetOutput]
    stencil SetStencil [if2is GetOutput]
    stencil ReverseStencilOn
    stencil SetBackgroundValue 128
    stencil ReleaseDataFlagOff

http://www.vtk.org/pipermail/vtkusers/2003-December/070876.html [^]
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  Notes
(0029875)
David Gobbi (developer)
2012-12-12 12:04

 Fixed by commit 82407dbb on Feb 18, 2011.

 Issue History
Date Modified Username Field Change
2008-11-30 09:10 Mathieu Malaterre Assigned To Mathieu Malaterre => David Cole
2011-01-19 09:55 David Cole Assigned To David Cole =>
2011-02-16 15:48 David Gobbi Assigned To => David Gobbi
2011-02-18 09:28 David Gobbi Status tabled => @80@
2011-02-18 09:28 David Gobbi Resolution open => fixed
2011-06-16 13:11 Zack Galbreath Category => (No Category)
2012-12-12 12:04 David Gobbi Note Added: 0029875
2012-12-12 12:04 David Gobbi Status customer review => closed

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