Hi, I am back with this extent bug. Reminder: a filter that produces output with larger extent than input has a weird behaviour.
I attached a ServerManager XML that describes the vtkImageResample filter. With this filter, you can choose an output spacing smaller than the input, inducing an oversampling of the input image. You can load it in ParaView as a Plugin. In ParaView, this simple pipeline will reproduce what I call here a bug (however, I hope that someone will tell me that my XML is soooo bad): builtin | Wavelet1 (Menu Sources -> Wavelet) | ImageResample1 (Menu Filters -> Image Resample ) - Wavelet is set to default values - Set, in ImageResample, the AxisOutputSpacing property to: 0.5 0.5 0.5 - Apply Now, take a look at the Information tabs: - Wavelet1 has an extent of [ -10,10 , -10,10 , -10,10 ] and same bounds. Normal, spacing is 1 - ImageResample extent ought to be [ -20,20 , -20,20 , -20,20 ] with bounds [ -10,10 , -10,10 , -10,10 ]. But it is not! Extent is unchanged, but the new spacing has been takn into account as the bounds are now [ -5,5 , ...]. My conclusion is that ParaView prevents the output extent to be greater than the input one (to be convinced, change the AxisOutputSpacing to 2: everything work well). Weird additional things: the outline representation is aligned to the input bounding box (good point: it has to be). But setting representation to slice or volume throw an error or show the slice with wrong extent/bounds. I hope that someone will tackle this problem: I thing it is not so rare to have output extent greater than input extent (oversampling, curved planar reformation, ...) see also: http://www.paraview.org/pipermail/paraview/2009-October/014306.html Thanks a lot Jerome
<ServerManagerConfiguration> <ProxyGroup name="filters"> <SourceProxy name="ImageResample" class="vtkImageResample" label="Image Resample"> <Documentation long_help="" short_help=""> </Documentation> <InputProperty name="Input" command="SetInputConnection"> <ProxyGroupDomain name="groups"> <Group name="sources"/> <Group name="filters"/> </ProxyGroupDomain> <DataTypeDomain name="input_type"> <DataType value="vtkImageData"/> </DataTypeDomain> </InputProperty> <DoubleVectorProperty name="AxisOutputSpacing" label="AxisOutputSpacing" command="SetAxisOutputSpacing" number_of_elements="3" number_of_elements_per_command="1" use_index="1" repeat_command="1" animateable="1" default_values="1 1 1" > <Documentation> Choose the component to extract. </Documentation> </DoubleVectorProperty> <DoubleVectorProperty name="AxisMagnificationFactor" label="AxisMagnificationFactor" command="SetAxisMagnificationFactor" number_of_elements="3" number_of_elements_per_command="1" use_index="1" repeat_command="1" animateable="1" default_values="1 1 1" > <Documentation> Choose the components to extract. </Documentation> </DoubleVectorProperty> <IntVectorProperty name="InterpolationMode" command="SetInterpolationMode" number_of_elements="1" default_values="2" animateable="0"> <EnumerationDomain name="enum"> <Entry value="0" text="NearestNeighbor"/> <Entry value="1" text="Linear"/> <Entry value="2" text="Cubic"/> </EnumerationDomain> <Documentation> </Documentation> </IntVectorProperty> <IntVectorProperty name="Interpolate" command="SetInterpolate" number_of_elements="1" default_values="1" animateable="0"> <BooleanDomain name="boolean"/> <Documentation> </Documentation> </IntVectorProperty> <IntVectorProperty name="ReleaseDataFlag" command="SetReleaseDataFlag" number_of_elements="1" default_values="0" animateable="0"> <BooleanDomain name="boolean"/> <Documentation> </Documentation> </IntVectorProperty> </SourceProxy> </ProxyGroup> </ServerManagerConfiguration>
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