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Usage
vtkProgrammableAttributeDataFilter is a filter that allows
you to write a custom procedure to manipulate attribute data
- either point or cell data. For example, you could generate
scalars based on a complex formula; convert vectors to
normals; compute scalar values as a function of vectors,
texture coords, and/or any other point data attribute; and
so on. The filter takes multiple inputs (input plus an
auxiliary input list), so you can write procedures that
combine several dataset point attributes. Note that the
output of the filter is the same type (topology/geometry) as
the input.
The filter works as follows. It operates like any other
filter (i.e., checking and managing modified and execution
times, processing Update() and Execute() methods, managing
release of data, etc.), but the difference is that the
Execute() method simply invokes a user-specified function
with an optional (void *) argument (typically the "this"
pointer in C++). It is also possible to specify a function
to delete the argument via ExecuteMethodArgDelete().
To use the filter, you write a procedure to process the
input datasets, process the data, and generate output data.
Typically, this means grabbing the input point or cell data
(using GetInput() and maybe GetInputList()), operating on it
(creating new point and cell attributes such as scalars,
vectors, etc.), and then setting the point and/or cell
attributes in the output dataset (you'll need to use
GetOutput() to access the output). (Note: besides C++, it is
possible to do the same thing in Tcl, Java, or other
languages that wrap the C++ core.) Remember, proper filter
protocol requires that you don't modify the input data - you
create new output data from the input.
To create an instance of class
vtkProgrammableAttributeDataFilter, simply invoke its
constructor as follows
obj = vtkProgrammableAttributeDataFilter
Methods
The class vtkProgrammableAttributeDataFilter has several
methods that can be used. They are listed below. Note that
the documentation is translated automatically from the VTK
sources, and may not be completely intelligible. When in
doubt, consult the VTK website. In the methods listed below,
obj is an instance of the vtkProgrammableAttributeDataFilter
class.
* string = obj.GetClassName ()
* int = obj.IsA (string name)
* vtkProgrammableAttributeDataFilter = obj.NewInstance ()
* vtkProgrammableAttributeDataFilter = obj.SafeDownCast
(vtkObject o)
* obj.AddInput (vtkDataSet in) - Add a dataset to the list
of data to process.
* obj.RemoveInput (vtkDataSet in) - Remove a dataset from
the list of data to process.
* vtkDataSetCollection = obj.GetInputList () - Return the
list of inputs.
* FreeMat_Documentation
* Visualization_Toolkit_Graphics_Classes
* Generated on Thu Jul 25 2013 17:18:32 for FreeMat by
doxygen_ 1.8.1.1
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