Ken, thank you for the answer, I'll check them. I already have the pdf and it is useful.
Thanks a lot, George Markomanolis On Wed, Feb 4, 2009 at 5:50 PM, Moreland, Kenneth <[email protected]> wrote: > George, > > If you don't want to save the full image data, then either poly data or > unstructured data is the way to go. (Poly data will probably be a bit more > efficient in ParaView, but either will work). > > If you are looking for a format to store the data in, you might consider > the VTK legacy data format. This format is documented in the VTK User's > manual and here: http://www.paraview.org/Wiki/Image:VTK-File-Formats.pdf > > As far as the topology is concerned, you have a couple of options. One is > just to define a bunch of "vertices" (0D cells). These will just appear as > points on the screen. The advantage is that they are easy to specify: You > just need coordinates and the data at that coordinate. The disadvantage is > that they are just drawn as a series of points. You run the risk of holes > appearing between the cells once the resolution of the data drops below the > pixel level. (That might not be a concern for you.) The other option is to > draw quadrilaterals either centered on each point or connecting 4 points. > The quads will make sure that the space is filled but require you to > specify more connectivity information. In either case, a Delaunay > triangulation seems unnecessarily complicated. > > -Ken > > > On 2/4/09 10:20 AM, "George Markomanolis" <[email protected]> > wrote: > > Dear Ken, > > First of all thank you for your time. Unfortunately I don't want to save > all the data to the files. For example I must save (and load, plot) 8GB of > full image than 500mb If i "erase" useless points. I have no idea about the > duration to plot 8GB and 500mb at paraview but I believe it's big (general > the useless points are 85-95% of full image). I'll try of course to check it > but we've developed a technique to "erase" useless data and I believe that > it won't be accepted from the team except if it is fast with paraview. For > example with gnuplot in order to have good quality I save data to eps format > and after I convert it to jpg (plotting is done at the cluster and we > download only the jpg files) but the convert is very low, for example 500mb > may take 10-15 minutes to plot and save. I'll try to plot full image. For > unstructured grid I don't know how to declare topology, I believe I need > something like delaunay (triangulation) at matlab? > > Thanks, > George Markomanolis > > On Wed, Feb 4, 2009 at 4:18 PM, Moreland, Kenneth <[email protected]> > wrote: > > ParaView is capable of reading in a regular grid of data, mapping a color > to it, and drawing it scaled on the screen. If your data is simply a raw > array written to disk, then ParaView can read that in directly. Does that > basically solve your problem? > > There are two ways to "erase" the useless points. The first way is to > simply set the color map up so that these values are simply drawn in the > background color. The second way is to use the "Threshold" filter to remove > the uninteresting points. The Threshold filter will convert the data from a > regular array to an unstructured grid. A warning about using Threshold > though: the unstructured grid it converts data to is a less efficient > representation so it is possible to actually require more data for the > result if not a lot is removed. > > -Ken > > > > On 2/4/09 2:30 AM, "George Markomanolis" <[email protected] < > http://[email protected]> > wrote: > > Dear all, > > I am newbie to Paraview and I want to ask you something. I am working with > signals and I use gnuplot for plotting. Unfortunately it's slow for big > signals. Our program is parallel so we can create files of many GBs. We do a > tricky parallel plot, every cpu plots a part of the signal, otherwise we > couldn't see the image from gnuplot (crash). So when I saw paraview I liked > a lot but it isn't easy. > > I must explain what I want to plot: > We use a techinque in order to cut the points that haven't energy. For > example a specific signal with 12000 x 12000 mesh of points which is 8GB > file it can go under of 1GB if we cut the useless points. So I give at the > gnuplot only the points that I want to plot x,y,z and I use pm3d map because > I want them in 2D not 3D for example see the image: > http://www.markomanolis.com/files/plots/plot.jpg > I would like to ask. Is this unstructured grid? I show an easy signal it > could be with more random points. I have tried unstructured grid for 2 > columns only and there is no surface between the columns. I used triangle > strip and it was ok but I don't know if I could see the details like here > (here I don't cut any useless point, in first image see wave details in the > center): http://www.markomanolis.com/files/plots/62_0_0.jpg , > http://www.markomanolis.com/files/plots/resFinal.jpg . > Could I have these plots with paraview or it is good with more complicated > plots? > I must write a script/ program to convert gnuplot file to paraview but I am > not sure about the topology, I must declare the topolgy for every point, > right? I am confused because I have a lot of constrains for example if a > point is alone then the topology is vertex if there is another point then > line etc... Is there any way to plot this grid with something like image > data. I want to give something like structured grid but NOT to give all the > points (I don't need them). The last two images I sent you are with all the > points for education propose. I want to plot something like first image but > witho more complicated topology > > Thank you for your time, > George Markomanolis > > > > **** Kenneth Moreland > *** Sandia National Laboratories > *********** > *** *** *** email: [email protected] <http://[email protected]> > ** *** ** 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: [email protected] > ** *** ** phone: (505) 844-8919 > *** web: > http://www.cs.unm.edu/~kmorel<http://www.cs.unm.edu/%7Ekmorel> > >
_______________________________________________ ParaView mailing list [email protected] http://www.paraview.org/mailman/listinfo/paraview
