[Paraview] Newbie question about Glyph filter

[Pierre-Yves Emelie]

Hi Eric,

Thanks a lot! That works great.

Just a couple of quick follow-up question:

- For the 'Scale Mode' with the Glyph filter, what is the difference
between choosing 'vector' and 'vector_components'. It looks like
choosing one or the other reverses the arrow direction..

- Also, with the Glyph filter, the color of the arrows is determined
by, let's say, the magnitude of the vector. However, what determines
the length of the arrows? It looks like it is not necessarily related
to the magnitude of the vector (see 'electron current' for example)..

Pierre

On Wed, Dec 1, 2010 at 2:34 PM, Eric E. Monson <emonson at cs.duke.edu> wrote:
> Hey Pierre,
>
> The Glyph filter only "glyphs" points, not cells, and all of your vectors are defined for cells. I would suggest running the data through the Cell Centers filter, which will place points at every cell center, and retain all of the cell-centered data attributes. This will result in a bunch of points, but no cells, so you can't visualize the data directly, but you can now apply the Glyph filter to this output and you'll see all of the arrows starting at the centers of your original cells.
>
> If you want to show both the arrows and the original surface at the same time, I'd suggest going to the Display tab for your glyphs and adding some Z translation to the Transformation at the bottom of the panel (so the arrows and surface don't run into each other).
>
> Also, note that some of your vector magnitudes are very small (electron and hole current), so if you don't see anything after you glyph them, it may be because you need a large Scale Factor for the glyphs. (I only mention this because at first I sized the glyphs according to the electrical field, but when I switched to hole current the Scale Factor didn't update it's value to a reasonable default and I couldn't see anything.)
>
> -Eric
>
>
> On Dec 1, 2010, at 1:38 PM, Pierre-Yves Emelie wrote:
>
>> Hi,
>>
>> I am a newbie with Paraview. I am trying to visualize the vector field
>> in the attached file. The file contains several vectors ('electrical
>> field', 'electron current', 'hole current'), as well as a number of
>> scalar arrays. I simply load the file, then apply a Glyph filter.
>> However, only the scalar arrays show up, none of the vectors can be
>> selected.. I just don't understand why. Any suggestions would be
>> greatly appreciated.
>>
>> Thank you very much for your help.
>>
>> Sincerely,
>>
>> Pierre
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