[vtkusers] Creating a polydata of edges (lines) from a vtkGraph

[Jeff Baumes]

>
> I tried to do that, but it said I needed to select a layout strategy.
> I tried to use vtkAssignCoordinatesLayoutStrategy
>
> http://www.rpi.edu/~doriad/VTK_List/GraphCoordinateAssignment/
>
> but I get the following error:
> vtkStreamingDemandDrivenPipeline (0x9761220): Algorithm
> vtkAssignCoordinates(0x975dfb0) returned failure for request:
> vtkInformation (0x9761e18)
>
>
If you are setting the points directly, you don't need to use vtkGraphLayout
at all. vtkAssignCoordinates is for setting the points on a graph from x, y,
z arrays in the VertexData.

Jeff
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