Dear Utkarsh, Thanks a lot for your detailed instructions and they are very helpful! I can show the difference along time now as a movie. However, I still have another question. By doing this, only the difference between current timestep and 0 is shown while the image for timestep 0 which contains the initial land/sea information is not represented. Do you have some idea on showing not only the surface changes but also the initial surface at the same time?
Many thanks! Xiao 2013/12/4 Utkarsh Ayachit <[email protected]> > Xiao, > > You can make ParaView compute a new data array that's the difference > between the values at 0 and the current timestep and then color with > that. To do that, do the following: > > + Open your snapshot000*.vtk file series as before. > + Now, open just the snapshoot0000.vtk file (the file for the first > time step) separately. In the file dialog, you can click on the "+" > icon next to the file group to expand the group and select a specific > file instead. > + Next, select the filter series source as well as the > snapshoot0000.vtk source and create the Python calculator. Your > pipeline browser should like the one in the attached image. > + Now for the Python calculator select Array Association as "Cell > Data" and setup an expression as follows to compare the quantities of > interest (as shown in the attached image). > > inputs[0].CellData["U"] - inputs[1].CellData["U"] > > Now when you color by result, you'll be coloring by the difference in > the quantities between timestep 0 and the current timestep. > > Utkarsh > > On Mon, Nov 25, 2013 at 2:47 PM, Utkarsh Ayachit > <[email protected]> wrote: > > Xiao Guo, > > > > I am sure what you want could be done. Do you have a sample dataset so > > I can play with it figure out what would be easiest route? > > > > Utkarsh > > > > On Thu, Nov 21, 2013 at 1:19 PM, xiao guo <[email protected]> > wrote: > >> Hi all, > >> > >> I am trying to visualize some vtk files which are generally a series of > >> values of wave and sea level of some area. Now I can just save an > animation > >> to show some movies of frame1,2,3,.... > >> However, it is not clear for some regions that the values there are > changed. > >> For example, when the wave goes to land, the value for the land > increases > >> from saying 5m to 6m, so there is 1m flood however which is not easy to > see > >> such small difference especially the change is even smaller saying 0.2 > m.. > >> What I am thinking is to 1) keep the first frame which is the initial > value > >> for the area as one layer or background with some color scheme; then 2) > >> based on the background from 1), difference between the values at step i > >> (i=2,3,...) and the initial value (step 0, background) are shown with > >> another color scheme, so both the initial image for the area and the > changes > >> afterwards can be shown clearly. > >> > >> But I am really not expert in such visualizing work or Paraview, so I > come > >> here and ask for help. Anyone knows that if I can do such complicated > work > >> in Paraview and how? Thank you all for attention! > >> > >> Cheers, > >> Xiao Guo > >> > >> _______________________________________________ > >> Powered by www.kitware.com > >> > >> Visit other Kitware open-source projects at > >> http://www.kitware.com/opensource/opensource.html > >> > >> Please keep messages on-topic and check the ParaView Wiki at: > >> http://paraview.org/Wiki/ParaView > >> > >> Follow this link to subscribe/unsubscribe: > >> http://www.paraview.org/mailman/listinfo/paraview > >> >
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