Thanks again, and I took a look on the programmable filter code. In my case the block consists of more than 1 million tetrahedrons and it will be time consuming to run iterations. Is there a way that I can export the cells and their corresponding point information to a numpy array? The ultimate goal is to calculate the volume of each tetrahedron.
Your help is much appreciated! Ken On Wed, Mar 23, 2011 at 4:45 PM, David Thompson <dcth...@sandia.gov> wrote: > > I have an Exodus II type file loaded into Paraview and trying to get the >>>> point ID for a group of cells. I know for vtk type object there are >>>> functions like GetCell(), GetPoint() >>>> >>>> I assume you're talking about using Python from ParaView? >>> >> >> Yup, that's exactly what I am doing here. >> > > There are 2 ways to use Python in ParaView: writing a programmable filter > and scripting the user interface. The former is evaluated on the server > where you can get access to (at least a portion of) the actual dataset. The > latter is evaluated on the client, which does not have access to the > datasets -- instead it has proxy objects that send messages to the servers, > telling them what to do. So, you can access the points and cells from within > a programmable filter, but not from within a client-side script. > > > >> and just wonder if there are such kind of routines available for Exodus >>>> II files. >>>> >>>> Yes, the ExodusII reader outputs VTK objects in a multiblock dataset. >>> You can use GetCell(), GetPoint(), and such on each individual block... you >>> just have to decide on a particular block. The ExodusII reader separates >>> things into blocks because each one may have different point and/or cell >>> variables. There are actually 2 levels of blocks; the top level segregates >>> datasets into groups that correspond to exodus blocks vs. sets. The second >>> level breaks individual blocks or sets into separate datasets. Does that >>> help? >>> >>> >> I am new in dealing with ex2 file, could you please be detailed? There is >> just one block in the dataset, so how to get the vtk object out from it so I >> can access the points and cells? >> > > > See the section of this page > http://www.vtk.org/Wiki/Python_Programmable_Filter > named "Dealing with Composite Datasets". It describes how to iterate over > all of the blocks in the dataset and run a function (in this case, one named > "flatten") on each block. > > David >
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