[vtkusers] StreamTracer input Attribute

[Kevin H. Hobbs]

On Thu, 2007-11-29 at 13:25 -0500, Kevin H. Hobbs wrote:
> I've been having difficulty producing streamlines. So far my pipeline
> looks like this:
> ImageData to ImageGradient to StreamTracer to XMLPolyDataWriter. The
> polydata this produces is empty. 
> 
> Do I need to use AssignAttribute between ImageGradient and StreamTracer?
> How should I set the attributes?
> Am I missing something else?

To be very specific I don't see why this doesn't work:

package require vtk

# Create some image data
vtkRTAnalyticSource image_source
image_source Update

# Calculate the gradient
vtkImageGradient gradient
gradient SetDimensionality 3
gradient SetInputConnection [image_source GetOutputPort]
gradient Update

# Create streamer
vtkStreamTracer streamer
streamer SetInputConnection [gradient GetOutputPort]
streamer Update

# write the streamline
vtkXMLPolyDataWriter stream_writer
stream_writer SetInputConnection [streamer GetOutputPort]
stream_writer SetFileName "tmp/stream.vtp"
stream_writer Write

exit

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