[vtkusers] Extracting the outer surface of a dataset with Blanking

[Randall Hand]

How can I extract a usable geometric outer surface of a dataset containing
Blanking Data (vtkStructuredGrid) ?

The vtkDataSetSurfaceFilter doesn't seem to respect blanking data, and
always returns the far outer surface, which is actually blanked.

The vtkStructuredGridGeometryFilter respects the blanking data, but returns
_all_ the data as a point cloud, with no actual geometry included.

Right now, the only way I've found is to use a Threshold to get the
non-blanked data, and then apply the vtkDataSetSurfaceFilter to it.
However, this requires ALOT of memory (converting structured -> unstructured
= about a 6x memory increase), and involves duplicating my blanking data as
a Point data array that I can use to threshold.  Surely there is a better
way?

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----------------------------------------
Randall Hand
Visualization Scientist
ERDC MSRC-ITL
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