[Paraview] Fwd: Re: negative value for a vector' magnitude

[Moreland, Kenneth]

That is clearly wrong, and I also see the same behavior. The problem appears to be in the handling of the data from the Angular Periodic Filter, which is a pretty new feature in ParaView. I’ve submitted a bug:

http://www.paraview.org/Bug/view.php?id=16079

A simple workaround is to use the calculator filter to compute the magnitude. The result of that comes out correct.

-Ken

On 4/19/16, 8:08 AM, "ParaView on behalf of Gena Bug" <paraview-bounces at paraview.org on behalf of archaerolog at mail.ru> wrote:

>-------- Forwarded Message --------
>Subject: Re: [Paraview] negative value for a vector' magnitude
>Date: Tue, 19 Apr 2016 16:07:58 +0300
>From: Gena Bug <archaerolog at mail.ru>
>To: Mandar Prakash Shirke <Mandar.Shirke at infosys.com>
>
>On 19.04.2016 15:20, Mandar Prakash Shirke wrote:
>> Hello,
>Hi,
>
>> Thank you for reply.
>> I did not understand what you said here & there is no file with name "negative_magnitude.pvsm" in Paraview directory.
>OK, let me explain it again: angular periodic filter creates full region
>from a partial one, also, despite transform filter, it correctly handle
>vector fields. However, rescale to data range doesn't work for vector
>fields in the complete region -- minimum value of magnitude is negative.
>
>Now step-by-step:
>1. create a plane [0, 1]x[0, 1]:
>Source -> Plane (Origin (0, 0, 0), Point1 (1, 0, 0), Point2 (0, 1, 0))
>2. create a vector field in it:
>Calculator (Point Data: coordsX*iHat + coordsY*jHat)
>3. create a full region [-1, 1]x[-1, 1] from the plane:
>AngularPeriodicFilter (Rotation Angle 90, Axis: Axis Z)
>4. Activate coloring for the vector field in the full region.
>
>After step 4 I see next (see snapshot.png).
>
>In the previous email I attached a state file with these steps.
>
>> Please find attached screenshot of error.
>Don't understand how this message corresponds to the problem... Is it
>happen when you try to load the state file?
>
>>
>> Regards,
>> Mandar
>>
>> -----Original Message-----
>> From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of Gena Bug
>> Sent: Tuesday, April 19, 2016 5:32 PM
>> To: ParaView <paraview at paraview.org>
>> Subject: [Paraview] negative value for a vector' magnitude
>>
>> Hi,
>>
>> I noticed that visualizing a vector' magnitude is incorrect -- minimum value in the range of values is negative. It happens when using AngularPeriodicFilter (see example in the attachment).
>>
>> OS: Debian testing amd64
>> PV: v.5.0.1 downloaded from the site
>>
>
>
>