[vtkusers] Problem with constant sized glyphs

[Malcolm Drummond]

Hi Matt

Have you tried vtkThreshold? You could use this to eliminate points/cells
prior to glyphing.

HTH
Malcolm Drummond
GeoVision cc

----- Original Message -----
From: "Matt Schmiermund" <matt at plasticflow.com>
To: "vtkhelp users list" <vtkusers at vtk.org>
Sent: Friday, March 18, 2005 8:58 PM
Subject: [vtkusers] Problem with constant sized glyphs


> When displaying vector data in vtk I am trying to use
> glyphs to create a constant sized arrow regardless of
> the magnitude. This is easily accomplished using the
> SetScaleModeToDataScalingOff() function, but a problem
> arrises with vectors of a magnitude of zero. When
> scaling according to vector magnitude the nodes with a
> zero velocity obviously don't have an arrow indicating
> velocity. But with scaling turned off there is an
> arrow drawn at every node. And those nodes with a zero
> velocity are given an arrow of the same length that
> points in the x direction. This clutters the
> visualization and I am looking for a way to prevent it
> from happenning.
>
> In the glyph class I tried to use the SetRange
> function and set it to something like 0.00001 and
> 9999999999.9. But this didn't fix the problem at all.
>
> If anyone has had a similar problem and knows a way to
> fix this I would appreciate any help.
>
> Thanks,
> Matt Schmiermund
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