[Paraview] Questions on Paraview with 3D vector fields

[Moreland, Kenneth]

Jim,

I think I'm pretty confused about what you are trying to do. I don't know what you mean by "pick center on one of the glyphs." Can you back up and describe in detail how you are setting up your visualization. What you use to read the data, what filters you apply, how you set up the display, and the interactions you are doing.

-Ken

-----Original Message-----
From: Jim [mailto:guilfordstuff at gmail.com] 
Sent: Monday, June 20, 2016 5:36 PM
To: Moreland, Kenneth <kmorel at sandia.gov>; paraview at paraview.org
Subject: [EXTERNAL] Re: [Paraview] Questions on Paraview with 3D vector fields

Ken:

I'm loading the vectors from a file (raw data format, 3 floats). I extract subset and make glyphs from that. When I try to pick center on one of the glyphs, I get the following message: "vtkSMRenderViewProxy
(0000000000056914B0): Snapping to the surface is not available therefore the camera focal point will be used to determine the depth of the picking."  This is the only reason I want to select a glyph. I've tried the point selection options that I can find.

I'm afraid animation is non-existent for my case. I have custom .vtp files that contain lines. I want to move the camera along that path. 
When I double click on the camera track I can see that it has the basics, a path and a focus (thanks for that, by the way), but I don't see a way to get my data into the camera track. It doesn't even look like there is a cut and paste option. I can write custom files for this sort of thing, but I just don't know how to get things to interact with my path data.

I have a similar problem with data display; I want to turn on vector glyphs around my path, but this line (I think Paraview considers it a point set) doesn't seem to be a first class object... there isn't a way to calculate using a line and a vector field or even two vector fields for that matter. It's starting to look like I have to learn to program yet another environment.

Thanks for any help you can give.

-Jim Daniels

On 06/20/2016 02:46 PM, Moreland, Kenneth wrote:
> Jim,
>
> It looks like you are asking two questions.
>
> The first question is about using the glyph filter. I'm not sure what the confusion is. The arrow glyph filter works equal well with polygons and polyhedral. I have no trouble loading in a 3D dataset with 3D cells and cell-centered data. I just select the arrow glyph and everything works fine. In short, I cannot replicate what your issue is. Perhaps you can give more information.
>
> As far as a fly through, yes it is possible in ParaView although, admittingly, the controls are not very good. To add a camera path, first open the Animation View (View -> Animation View). Then add a track to the Animation View for "Camera, Follow Path". After that, double click the track to bring up the keyframes dialog. From there you can double click "Path..." to get yet another dialog box to edit the path. Click "Camera Position" and then click back to the main ParaView window to edit the camera path.
>
> -Ken
>
> -----Original Message-----
> From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of Jim
> Sent: Wednesday, June 15, 2016 8:10 PM
> To: paraview at paraview.org
> Subject: [EXTERNAL] [Paraview] Questions on Paraview with 3D vector 
> fields
>
> Hello All:
>
> I'm working with 3D vector fields (2 of them in the same space) and want to do a fly through, set the center to be one of the arrow glyphs, and do some calculations on both fields using the calculator. I can't seem to do any of these. Any ideas?
>
> It looks like the center selection was designed to work with polymeshes.
> The arrow glyphs just can't be selected. Is there any way to fake out Paraview and place something that the selector can see?
>
> I saw fly through mentioned on some forum but no solution. I can place a line into my space. Is there some way to use the line as a camera path?
> I'm really interested in fly throughs in the program, not watching them as a movie. There's just too many things to change to make it a movie and not take forever to make/look at them.
>
> The calculator looks like it only hooks up to one vector field at a time. Is there some object linking trick or running one field through an intermediate calculation that would make both fields visible to the calculator?
>
> Any help appreciated.
>
> -J
>
>
>
>
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