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.<div>
<br></div><div>If you need to define an arbitrary set of cubes, you probably need an unstructured grid.</div><div><br></div><div>Can you give us an example of your dataset and visualization you want to do? A picture maybe?</div>
<div><br></div><div>-berk<br><br><div class="gmail_quote">On Sun, Dec 12, 2010 at 10:15 AM, Jeff Johnson <span dir="ltr"><<a href="mailto:jj56@indiana.edu">jj56@indiana.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
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?<br>
<font color="#888888"><br>
-Jeff<br>
</font><div><div></div><div class="h5"><br>
<br>
On Dec 12, 2010, at 03:27 , Sebastien Jourdain wrote:<br>
<br>
> Hi Jeff,<br>
><br>
> on the help page of vtk (<a href="http://www.vtk.org/VTK/help/documentation.html" target="_blank">http://www.vtk.org/VTK/help/documentation.html</a>)<br>
> you do have a link on the VTK file format.<br>
> You should be able to find all the informations that you need here:<br>
> <a href="http://www.vtk.org/VTK/img/file-formats.pdf" target="_blank">http://www.vtk.org/VTK/img/file-formats.pdf</a><br>
><br>
> Seb<br>
><br>
> On Sat, Dec 11, 2010 at 8:44 PM, Jeff Johnson <<a href="mailto:jj56@indiana.edu">jj56@indiana.edu</a>> wrote:<br>
>> Hi all,<br>
>><br>
>> 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.<br>
>><br>
>> -Jeff<br>
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