ParaView

[khof...@gmail.com]

Hi everyone,

I've been looking into plotting data from simulations and was hoping if any of you could direct me to useful ParaView tutorials, videos, or any hints and tips in general.

Thus far I've gotten to convert the files to vts format and opening them. What I'd like to do to get started is to plot the arrows and look into stray field maps of slices.

Thanks in advance!

[Felipe Garcia]

Hi,

I can not recommend you a tutorial but show you some examples.

First you have to generate the vts files with the option -vtk=binary of mumax3-convert or -vtk=ascii if you want to have them in different operating systems but ascii occupies a larger file size.

One you have this you have to load them. If you open one file, it operates on 1 file. If you open the full sequence m..vts, it opens the full sequence and each one is a time step, one can change from time step to time step with the Play and Next Frame icons.

One can then do a hierarchy of operations, which normally are the different filters.

Each filter operates using either point or cell information. Also it can require either vector or scalar operations.

When one opens the vts then it does not appear anything because it is not proper for representation because paraview does not know how to represent the data.

After each filter one has to click on the Apply button. Attached one can find two screenshots, one to produce contour plots and the other to produce slices.

By default, one has to do an operation to obtain the representation. In rectangular geometries one can use Extract surface. In the case of a cylinder, then one needs to remove the cells with no magnetization.

To do that one uses the filter Calculator, and calculates mag(m) as the Result. This produces a new scalar Result. Then one applies the Threshold filter, operating on Result. One selects the range between 0.1 and 1.1. This removes all the elements that do not belong to the cylinder. The contour plot only operates on scalars. So one has to use a Calculator to get m_z as Result2. Then one can see that Contour is enabled as soon as there is an scalar available and one selects Result2

The same can be done for Slice, but now one can start from Threshold, this produces another tree of filters. One selects what is visible with the Eye next to each filter and this is different depending on which window.

Glyph is a Filter that produces arrows. By default they are randomly distributed. One has to select the size so that they are nice but there are plenty of parameters to adjust. For the meaning of the remaining Filters one can take a look at the brief documentation or in the forums.

One can save a video from it with each frame corresponding to a time step, better save it in png or jpeg and then use another software to produce the video because then one can control the quality.

One can also write all the operations in a file and use it to produce all the operations. This Save state. With that one can Load state and start from the last operation. If you are familiar with python one

Best regards,

Felipe

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