[Paraview] Color bar rescaling for transient datasets

[Scott, W Alan]

I would be in favor of either taking the last time step, or preferably using all of them.  If you take a subset of any chaotic event, you will miss spikes.

Alan

________________________________
From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of Renato Elias
Sent: Thursday, May 14, 2009 10:29 AM
To: Moreland, Kenneth
Cc: paraview at paraview.org
Subject: Re: [Paraview] Color bar rescaling for transient datasets

What about interpolating the ranges in a regular number of time steps? For instance, let's say we have a dataset with 100 time steps. Instead of loading all files to find the correct range, we could have an estimative by computing the maximum and minimum values using only 20 or 50 time steps. Maybe the user could choose how many time steps should be skipped.

more two cents :oP

Renato.



On Thu, May 14, 2009 at 1:15 PM, Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>> wrote:
I am told that EnSight find the range by loading the range from the last time step, which is where we got the idea.  It might be more to it than that.  Perhaps if the file format stores ranges over times it will load that and you data follows that?

-Ken



On 5/14/09 9:00 AM, "Renato Elias" <rnelias at gmail.com<http://rnelias@gmail.com>> wrote:

I wonder know what's the magic behind Ensight. It loads the transient data range almost instantaneously. We just set a variable to paint the model and the color bar appears with a reasonable range for the transient data.

Ken, setting the range by the last time step is a bit dangerous isn't it? For example, in my case, I'm coloring a dam break fluid flow model by the velocity magnitude. In this problem we stop the simulation after the fluid rests in a static position. Therefore the last time step velocity should be almost zero.

Renato.

On Thu, May 14, 2009 at 10:33 AM, Moreland, Kenneth <kmorel at sandia.gov<http://kmorel@sandia.gov>> wrote:
This issue has come up quite a bit.  We are trying to think of a way to set the range reasonably while avoiding expensive loading and maintaining consistent behavior.  One idea we are considering is to set the range based on the last time step, which often has a range close to the full range.

-Ken



On 5/14/09 7:28 AM, "Chris Kees" <christopher.e.kees at usace.army.mil<http://christopher.e.kees@usace.army.mil> <http://christopher.e.kees@usace.army.mil> > wrote:

I would be interested in a simple way  to do this too.  It seems like a potentially expensive choice since it requires loading every time step, but it would be worth having it as a simple option.

On May 14, 2009, at 8:13 AM, Renato Elias wrote:

Ok, I've just found a way using the "Temporal Statistics" filter to get the maximum and minimum values. After that we just need to fix the color bar range using these values.

Just to keep the question:

Is there any simpler or automatic way to do that?

Cheers

Renato.

On Thu, May 14, 2009 at 10:05 AM, Renato Elias <rnelias at gmail.com<http://rnelias@gmail.com> <http://rnelias@gmail.com> > wrote:


Does anyone know if it's possible to rescale the color bar considering all values of a transient dataset? I just need to get the maximum and minimum values across all time steps.

thanks for any help.

 Renato.


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   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: kmorel at sandia.gov<http://kmorel@sandia.gov> <http://kmorel@sandia.gov>
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel<http://www.cs.unm.edu/%7Ekmorel> <http://www.cs.unm.edu/%7Ekmorel>





   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: kmorel at sandia.gov<http://kmorel@sandia.gov>
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel<http://www.cs.unm.edu/%7Ekmorel>


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