# No Pyhton wrapper for SetSnap To CellWithClosestPoint() ?
**URL:** https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714
**Category:** Support
**Created:** [February 16, 2023, 10:03pm UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714 "2023-02-16T22:03:48Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@aborsic](https://discourse.vtk.org/u/aborsic)
#### Post date: [February 16, 2023, 10:03pm UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714/1 "2023-02-16T22:03:48Z")
Hello Everyone,
I have an input dataset which is a polydata consisting only of points with associated scalars. I need to resample it at point locations with a second point-only polydata.
I would like to use the nearest neighbor interpolation, but in Python it seems that the method SetSnapToCellWithClosestPoint() is not wrapped for the classes vtkProbeFilter and vtkResampleWithDataSet.
Can anyone confirm this is true? If yes, is there a specific reason for this?
Does anyone have a suggestion for any other approach to nearest neighbor interpolation? (I need to use Python bindings)
Thanks in advance for any suggestion/comment,
Best Regards,
Andrea
---
### Author:  [@amaclean](https://discourse.vtk.org/u/amaclean)
#### Post date: [February 18, 2023, 5:31am UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714/3 "2023-02-18T05:31:40Z")
I checked using [PointInterpolator](https://kitware.github.io/vtk-examples/site/Python/Meshes/PointInterpolator/) adding the line
```plaintext
resample.SnapToCellWithClosestPointOn()
```
and this works Ok. I also checked using
- `SnapToCellWithClosestPointOn()`
- `SnapToCellWithClosestPointOff()`
- `SetSnapToCellWithClosestPoint(True)`
All are wrapped OK. I used the vtk master in Linux. So wrapping seems to be Ok.
---
### Author:  [@aborsic](https://discourse.vtk.org/u/aborsic)
#### Post date: [February 23, 2023, 9:08am UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714/4 "2023-02-23T09:08:24Z")
> [@amaclean](#):
>
> `SnapToCellWithClosestPointOn()`
Hi Andrew,
Thanks for checking. If I try that, I get:
_AttributeError: ‘vtkmodules.vtkFiltersPoints.vtkPointInterpolator’ object has no attribute ‘SnapToCellWithClosestPointOn’_
dir(resample) does not show in fact the method.
I am using VTK 9.2.6 on Windows 11, with Python 3.6.8 64 bit
Cheers,
Andrea
---
### Author:  [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)
#### Post date: [February 24, 2023, 12:43am UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714/5 "2023-02-24T00:43:19Z")
I don’t see that method on `vtkPointInterpolator`, but I do see it on `vtkProbeFilter` and `vtkResampleWithDataSet` (both from `vtkFiltersCore`).
---
### Author:  [@aborsic](https://discourse.vtk.org/u/aborsic)
#### Post date: [February 24, 2023, 12:33pm UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714/6 "2023-02-24T12:33:05Z")
Humm,
I still get the error for both filters, vtkProbeFilter and vtkResampleWithDataset. The messages look like this:
_AttributeError: ‘vtkmodules.vtkFiltersCore.vtkProbeFilter’ object has no attribute ‘SnapToCellWithClosestPointOn’_
_AttributeError: ‘vtkmodules.vtkFiltersParallelDIY2.vtkPResampleWith’ object has no attribute ‘SnapToCellWithClosestPointOn’_
One difference I notice is that your ResampleWithDataset belongs to vtkFiltersCore and mine is under vkFiltersParallelDIY2 (which I am not sure what it is), but I have instantiated the filter simply as: sf = vtk.vtkResampleWithDataSet()
Thanks for any advice,
Andrea
P.S. I have installed VTK with pip
---
### Author:  [@aborsic](https://discourse.vtk.org/u/aborsic)
#### Post date: [February 24, 2023, 12:41pm UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714/7 "2023-02-24T12:41:45Z")
This code snippet:
import vtk
f = vtk.vtkProbeFilter()
attrib\_list = dir(f)
for attr in attrib\_list:
print(f"Attribute: {attr}\n")
produces the output below, which does not include any method related to snapping:
Attribute: AbortExecuteOff
Attribute: AbortExecuteOn
Attribute: AddInputConnection
Attribute: AddInputData
Attribute: AddInputDataObject
Attribute: AddObserver
Attribute: BreakOnError
Attribute: CAN\_HANDLE\_PIECE\_REQUEST
Attribute: CAN\_PRODUCE\_SUB\_EXTENT
Attribute: CategoricalDataOff
Attribute: CategoricalDataOn
Attribute: ComputeToleranceOff
Attribute: ComputeToleranceOn
Attribute: ConvertTotalInputToPortConnection
Attribute: DEFAULT\_PRECISION
Attribute: DOUBLE\_PRECISION
Attribute: DebugOff
Attribute: DebugOn
Attribute: DesiredOutputPrecision
Attribute: FastDelete
Attribute: GetAbortExecute
Attribute: GetAddressAsString
Attribute: GetCategoricalData
Attribute: GetCellLocatorPrototype
Attribute: GetClassName
Attribute: GetCommand
Attribute: GetComputeTolerance
Attribute: GetDebug
Attribute: GetErrorCode
Attribute: GetExecutive
Attribute: GetFindCellStrategy
Attribute: GetGlobalWarningDisplay
Attribute: GetImageDataOutput
Attribute: GetInformation
Attribute: GetInput
Attribute: GetInputAlgorithm
Attribute: GetInputArrayInformation
Attribute: GetInputConnection
Attribute: GetInputDataObject
Attribute: GetInputExecutive
Attribute: GetInputInformation
Attribute: GetInputPortInformation
Attribute: GetIsInMemkind
Attribute: GetMTime
Attribute: GetNumberOfGenerationsFromBase
Attribute: GetNumberOfGenerationsFromBaseType
Attribute: GetNumberOfInputConnections
Attribute: GetNumberOfInputPorts
Attribute: GetNumberOfOutputPorts
Attribute: GetObjectDescription
Attribute: GetObjectName
Attribute: GetOutput
Attribute: GetOutputDataObject
Attribute: GetOutputInformation
Attribute: GetOutputPort
Attribute: GetOutputPortInformation
Attribute: GetPassCellArrays
Attribute: GetPassFieldArrays
Attribute: GetPassPointArrays
Attribute: GetPolyDataOutput
Attribute: GetProgress
Attribute: GetProgressObserver
Attribute: GetProgressScale
Attribute: GetProgressShift
Attribute: GetProgressText
Attribute: GetRectilinearGridOutput
Attribute: GetReferenceCount
Attribute: GetReleaseDataFlag
Attribute: GetSource
Attribute: GetSpatialMatch
Attribute: GetStructuredGridOutput
Attribute: GetStructuredPointsOutput
Attribute: GetTolerance
Attribute: GetTotalNumberOfInputConnections
Attribute: GetUnstructuredGridOutput
Attribute: GetUpdateExtent
Attribute: GetUpdateGhostLevel
Attribute: GetUpdateNumberOfPieces
Attribute: GetUpdatePiece
Attribute: GetUsingMemkind
Attribute: GetValidPointMaskArrayName
Attribute: GetValidPoints
Attribute: GlobalWarningDisplayOff
Attribute: GlobalWarningDisplayOn
Attribute: HasExecutive
Attribute: HasObserver
Attribute: INPUT\_ARRAYS\_TO\_PROCESS
Attribute: INPUT\_CONNECTION
Attribute: INPUT\_IS\_OPTIONAL
Attribute: INPUT\_IS\_REPEATABLE
Attribute: INPUT\_PORT
Attribute: INPUT\_REQUIRED\_DATA\_TYPE
Attribute: INPUT\_REQUIRED\_FIELDS
Attribute: InitializeObjectBase
Attribute: InvokeEvent
Attribute: IsA
Attribute: IsTypeOf
Attribute: Modified
Attribute: ModifyRequest
Attribute: NewInstance
Attribute: PassCellArraysOff
Attribute: PassCellArraysOn
Attribute: PassFieldArraysOff
Attribute: PassFieldArraysOn
Attribute: PassPointArraysOff
Attribute: PassPointArraysOn
Attribute: ProcessRequest
Attribute: PropagateUpdateExtent
Attribute: Register
Attribute: ReleaseDataFlagOff
Attribute: ReleaseDataFlagOn
Attribute: RemoveAllInputConnections
Attribute: RemoveAllInputs
Attribute: RemoveAllObservers
Attribute: RemoveInputConnection
Attribute: RemoveObserver
Attribute: RemoveObservers
Attribute: SINGLE\_PRECISION
Attribute: SafeDownCast
Attribute: SetAbortExecute
Attribute: SetCategoricalData
Attribute: SetCellLocatorPrototype
Attribute: SetComputeTolerance
Attribute: SetDebug
Attribute: SetDefaultExecutivePrototype
Attribute: SetExecutive
Attribute: SetFindCellStrategy
Attribute: SetGlobalWarningDisplay
Attribute: SetInformation
Attribute: SetInputArrayToProcess
Attribute: SetInputConnection
Attribute: SetInputData
Attribute: SetInputDataObject
Attribute: SetMemkindDirectory
Attribute: SetObjectName
Attribute: SetPassCellArrays
Attribute: SetPassFieldArrays
Attribute: SetPassPointArrays
Attribute: SetProgressObserver
Attribute: SetProgressShiftScale
Attribute: SetProgressText
Attribute: SetReferenceCount
Attribute: SetReleaseDataFlag
Attribute: SetSourceConnection
Attribute: SetSourceData
Attribute: SetSpatialMatch
Attribute: SetTolerance
Attribute: SetValidPointMaskArrayName
Attribute: SpatialMatchOff
Attribute: SpatialMatchOn
Attribute: UnRegister
Attribute: Update
Attribute: UpdateDataObject
Attribute: UpdateExtent
Attribute: UpdateExtentIsEmpty
Attribute: UpdateInformation
Attribute: UpdatePiece
Attribute: UpdateProgress
Attribute: UpdateTimeStep
Attribute: UpdateWholeExtent
Attribute: UsesGarbageCollector
Attribute: **class**
Attribute: **delattr**
Attribute: **dict**
Attribute: **dir**
Attribute: **doc**
Attribute: **eq**
Attribute: **format**
Attribute: **ge**
Attribute: **getattribute**
Attribute: **gt**
Attribute: **hash**
Attribute: **init**
Attribute: **init\_subclass**
Attribute: **le**
Attribute: **lt**
Attribute: **ne**
Attribute: **new**
Attribute: **reduce**
Attribute: **reduce\_ex**
Attribute: **repr**
Attribute: **setattr**
Attribute: **sizeof**
Attribute: **str**
Attribute: **subclasshook**
Attribute: **this**
Attribute: **vtkname**
Attribute: override
---
### Author:  [@dgobbi](https://discourse.vtk.org/u/dgobbi)
#### Post date: [February 24, 2023, 1:42pm UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714/8 "2023-02-24T13:42:58Z")
Those methods are only in the master branch, they aren’t yet in any releases.
---
### Author:  [@dgobbi](https://discourse.vtk.org/u/dgobbi)
#### Post date: [February 24, 2023, 3:10pm UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714/9 "2023-02-24T15:10:13Z")
The `vtkPointInterpolator` with the `vtkVoronoiKernel` should provide the kind of nearest-neighbor interpolation that you’re looking for.
```python
kernel = vtkVoronoiKernel()
probe = vtkPointInterpolator()
probe.SetInputConnection(input_data)
probe.SetSourceData(source_data)
probe.SetLocator(point_locator_for_source_data)
probe.SetKernel(kernel)
```
---
### Author:  [@aborsic](https://discourse.vtk.org/u/aborsic)
#### Post date: [February 24, 2023, 3:12pm UTC](https://discourse.vtk.org/t/no-pyhton-wrapper-for-setsnap-to-cellwithclosestpoint/10714/10 "2023-02-24T15:12:48Z")
David,
Thank you so much for the information.
Best Regards,
Andrea