Section: Visualization Toolkit Graphics Classes
To use this filter set the VOI ivar which are i-j-k min/max indices that specify a rectangular region in the data. (Note that these are 0-offset.) You can also specify a sampling rate to subsample the data.
Typical applications of this filter are to extract a plane from a grid for contouring, subsampling large grids to reduce data size, or extracting regions of a grid with interesting data.
To create an instance of class vtkExtractGrid, simply invoke its constructor as follows
obj = vtkExtractGrid
obj
is an instance of the vtkExtractGrid class.
string = obj.GetClassName ()
int = obj.IsA (string name)
vtkExtractGrid = obj.NewInstance ()
vtkExtractGrid = obj.SafeDownCast (vtkObject o)
obj.SetVOI (int , int , int , int , int , int )
- Specify i-j-k (min,max) pairs to extract. The resulting structured grid
dataset can be of any topological dimension (i.e., point, line, plane,
or 3D grid).
obj.SetVOI (int a[6])
- Specify i-j-k (min,max) pairs to extract. The resulting structured grid
dataset can be of any topological dimension (i.e., point, line, plane,
or 3D grid).
int = obj. GetVOI ()
- Specify i-j-k (min,max) pairs to extract. The resulting structured grid
dataset can be of any topological dimension (i.e., point, line, plane,
or 3D grid).
obj.SetSampleRate (int , int , int )
- Set the sampling rate in the i, j, and k directions. If the rate is > 1,
then the resulting VOI will be subsampled representation of the input.
For example, if the SampleRate=(2,2,2), every other point will be
selected, resulting in a volume 1/8th the original size.
obj.SetSampleRate (int a[3])
- Set the sampling rate in the i, j, and k directions. If the rate is > 1,
then the resulting VOI will be subsampled representation of the input.
For example, if the SampleRate=(2,2,2), every other point will be
selected, resulting in a volume 1/8th the original size.
int = obj. GetSampleRate ()
- Set the sampling rate in the i, j, and k directions. If the rate is > 1,
then the resulting VOI will be subsampled representation of the input.
For example, if the SampleRate=(2,2,2), every other point will be
selected, resulting in a volume 1/8th the original size.
obj.SetIncludeBoundary (int )
- Control whether to enforce that the "boundary" of the grid is output in
the subsampling process. (This ivar only has effect when the SampleRate
in any direction is not equal to 1.) When this ivar IncludeBoundary is
on, the subsampling will always include the boundary of the grid even
though the sample rate is not an even multiple of the grid
dimensions. (By default IncludeBoundary is off.)
int = obj.GetIncludeBoundary ()
- Control whether to enforce that the "boundary" of the grid is output in
the subsampling process. (This ivar only has effect when the SampleRate
in any direction is not equal to 1.) When this ivar IncludeBoundary is
on, the subsampling will always include the boundary of the grid even
though the sample rate is not an even multiple of the grid
dimensions. (By default IncludeBoundary is off.)
obj.IncludeBoundaryOn ()
- Control whether to enforce that the "boundary" of the grid is output in
the subsampling process. (This ivar only has effect when the SampleRate
in any direction is not equal to 1.) When this ivar IncludeBoundary is
on, the subsampling will always include the boundary of the grid even
though the sample rate is not an even multiple of the grid
dimensions. (By default IncludeBoundary is off.)
obj.IncludeBoundaryOff ()
- Control whether to enforce that the "boundary" of the grid is output in
the subsampling process. (This ivar only has effect when the SampleRate
in any direction is not equal to 1.) When this ivar IncludeBoundary is
on, the subsampling will always include the boundary of the grid even
though the sample rate is not an even multiple of the grid
dimensions. (By default IncludeBoundary is off.)