[vtkusers] Visualisation of PIV data

[Berk Geveci]

Hi,

> I tried that today using a vtkGlyph3D and a vtkArrowSource as Source for 
> the Glyph. But I only get vectors which lie within the plane even when 
> the third component is not zero.

This is very strange. I use glyph3D all the time and never encountered
this problem. Can you send me a small data file that demonstrates the
problem?

> I know but unfortunately I'm only doing the user-end visualization using 
> a library which only understands vtkPolyData, e.g. I do not want to 
> extend the library to use vtkImageData.

Ah. I see.

> 
> And besides, the vtkGlyph3D only gets vtkPolyData as input, doesn't it? 
> (Maybe I could transform an image into vtkPolyData but that's not that 
> easy for large datasets.)

No. The glyph source has to be polydata, the input can be any dataset
type.