this is working for me https://gist.github.com/capitalaslash/9246262
after making public a couple of functions and the _vtk_grid member. in practice, what you need is a new method that sets up the vtk structure, as it is done in the first part of VTKIO::write_nodal_data(). in order to restore all the methods and members to their original intended privateness, that section should be extracted from that method and made public. i can prepare a pull request for this if the developers do agree on it. if you need to populate also solution arrays you need to look further in the write_nodal_data() routine and modularize it in 3 parts: vtk mesh creation, solution array fill and print out. cheers, On Thu, Feb 27, 2014 at 8:29 AM, Erich Gaertig <erichgaer...@web.de> wrote: > > Am 26.02.2014 um 17:11 schrieb Kirk, Benjamin (JSC-EG311) > <benjamin.k...@nasa.gov>: > >> On Feb 26, 2014, at 9:59 AM, John Peterson <jwpeter...@gmail.com> wrote: >> >>> This sounds like an interesting idea, but as you have discovered, VTKIO is >>> pretty far away from being able to do that as it stands. >>> >>> At the very least, you might be able to use it for inspiration to do what >>> you want... >> >> Agreed. An option could be to extend the VTKIO Constructor to take a >> function object to call, providing it the pointer while it is valid. That >> would result in libMesh calling your arbitrary code at some point. I'm not >> sure I understand your use case, but you might also need a method to bypass >> writing the resulting data structure to disk? > > I'm not so sure about it. As far as I understood it from digging into the > headers and source code of vtkio, this class already has a private member > called _vtk_grid, which is a vtkUnstructuredGrid*. This private member is > already used in other private functions like nodes_to_vtk(), cells_to_vtk(), > system_vectors_to_vtk(...) to fill it with the proper data. Actually, the > public member functions like write_nodal_data(...), write(..), > write_equation_systems(...) use these private functions to set up the > _vtk_grid-variable before they use a vtkXMLPUnstructuredGridWriter to > actually write the file to disk. All I would need is this kind of > functionality without the final call to the unstructured grid writer. For > example, I guess it would help to make the private functions public.. > And just to clarify my use case a bit: It's just about visualizing simulation > results in the same program that does the simulation. Up to now, I write a > program that uses libmesh to solve a certain differential equation. Then an > output file is written and I open Paraview to visualize it. Currently, I'm > writing a little test program, that links against libmesh and VTK. The goal > is to do the simulationa and visualization in the same program. One example > where this might be useful are time-evolutions, where you can visualize the > results right as they are computed by libmesh or consider a time-independent > PDE with a certain set of free parameters you can adjust. As you change the > parameters programmatically, I would like to see the results instantly after > the computation in the same program without doing the cycle 'compute > solution->write file to disk->open paraview to view it -> repeat it for the > next parameter.. > > Cheers > > Erich > > > > > ------------------------------------------------------------------------------ > Flow-based real-time traffic analytics software. Cisco certified tool. > Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer > Customize your own dashboards, set traffic alerts and generate reports. > Network behavioral analysis & security monitoring. All-in-one tool. > http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk > _______________________________________________ > Libmesh-users mailing list > Libmesh-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/libmesh-users ------------------------------------------------------------------------------ Flow-based real-time traffic analytics software. Cisco certified tool. Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer Customize your own dashboards, set traffic alerts and generate reports. Network behavioral analysis & security monitoring. All-in-one tool. http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
