Hey, cool, I just tried that on some test data, and it looks like it might do the trick. I do have a rather large dataset, but I'll try both this and Sebastian's suggestion and see what happens. Thanks!
-Jeff On Dec 13, 2010, at 15:31 , Berk Geveci wrote: > What you need is to volume render cell data instead of point data. > Unfortunately, ParaView does not support volume rendering of cell data in > images. However, it supports volume rendering of cell data in unstructured > grids. Try this: > > - Create a STRUCTURED_POINTS with cell data > - Load it > - Apply Clean to Grid > - Volume render > > I wouldn't recommend doing this if your volumes are going to become large. > > -berk > > On Mon, Dec 13, 2010 at 10:41 AM, Jeff Johnson <[email protected]> wrote: > This is great, thanks Berk and Sebastien. Yes, I am trying to do volume > rendering. My dataset represents a 3D grid occupancy map, where each cell has > a specified likelihood of occupancy. I'd like to render that as a set of unit > cells, where the opacity is directly related to the likelihood of occupancy > (i.e., totally opaque means likelihood of 1, totally transparent mean > likelihood of 0). Does that make sense? > > I did try STRUCTURED_POINTS for doing the volume rendering, and it's seems > close to what I'm looking for, but maybe I'm not setting it up quite right: > The coloring seems to radiate out from one side, and it also seems to bleed > out into neighboring cells. If I could get the color to radiate from the > center out (or just have the cell uniformly colored), and have the coloring > end at the cell boundaries, that would be perfect. I've attached a pic of > what I see. > > Thanks again, guys. > > -Jeff > > > > > On Dec 13, 2010, at 07:22 , Berk Geveci wrote: > > > Assuming that you are defining a uniform rectilinear grid, you need > > STRUCTURED_POINTS. As for defining opacity, what is your goal? To do volume > > rendering? Other than when using volume rendering, opacity does not have > > any effect. > > > > If you need to define an arbitrary set of cubes, you probably need an > > unstructured grid. > > > > Can you give us an example of your dataset and visualization you want to > > do? A picture maybe? > > > > -berk > > > > On Sun, Dec 12, 2010 at 10:15 AM, Jeff Johnson <[email protected]> wrote: > > Thanks, but I'm totally new to the VTK file format and ParaView, and the > > documentation is not clear. It seems like the STRUCTURED_GRID geometry is > > the proper one for what I need, but I can find virtually no examples of > > it's use. For instance, if I want to specify a set of unit cubes from a set > > of points, do I do that in POINT_DATA or CELL_DATA? If I want to color them > > and set an opacity, where does that information go? The documentation says > > that a lookup table is a set of RGBA values that is associated with scalar > > data, but what does the scalar data represent, and how do I associated it > > with the cubes? > > > > -Jeff > > > > > > On Dec 12, 2010, at 03:27 , Sebastien Jourdain wrote: > > > > > Hi Jeff, > > > > > > on the help page of vtk (http://www.vtk.org/VTK/help/documentation.html) > > > you do have a link on the VTK file format. > > > You should be able to find all the informations that you need here: > > > http://www.vtk.org/VTK/img/file-formats.pdf > > > > > > Seb > > > > > > On Sat, Dec 11, 2010 at 8:44 PM, Jeff Johnson <[email protected]> wrote: > > >> Hi all, > > >> > > >> I'm using ParaView to visualize a dataset, and I'm trying to generate an > > >> ASCII VTK file that will specify a set of voxels, where each voxel has > > >> an associated color and opacity. Does anyone have any suggestions for > > >> how I should format the file? It seems like this should be easy, but I > > >> can't make heads or tails of the documentation. > > >> > > >> -Jeff > > >> _______________________________________________ > > >> 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 > > >> > > > > _______________________________________________ > > 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 > > > > > _______________________________________________ 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
