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<DIV dir=ltr align=left><SPAN class=436301216-15022006><FONT face=Arial
color=#0000ff size=2>You can run 'CleanToGrid'. That filter will merge
co-incident points, this may solve your problem... worth a try at least
:)</FONT></SPAN></DIV>
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<P><FONT face=Fixedsys><B><FONT size=1>Brian Wylie - Org 9227</FONT></B>
<BR><B><FONT size=1>Sandia National Laboratories</FONT></B> <BR><B><FONT
size=1>MS 0822 - Building 880/A1-J</FONT></B> <BR><B><FONT size=1>(505)844-2238
FAX(505)845-0833
</FONT></B><BR><FONT size=1>
____
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\____ _________ | | / (_)__ _ __
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Unleash the Beast</FONT></FONT> </P>
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<FONT face=Tahoma size=2><B>From:</B>
vtk-developers-bounces+bnwylie=sandia.gov@vtk.org
[mailto:vtk-developers-bounces+bnwylie=sandia.gov@vtk.org] <B>On Behalf Of
</B>Randall Hand<BR><B>Sent:</B> Wednesday, February 15, 2006 8:59
AM<BR><B>To:</B> Burlen<BR><B>Cc:</B> John Dorelli; vtk-developers@vtk.org;
Douglas.Larson@unh.edu; vtkusers@vtk.org; Jimmy Raeder; Thompson, David
C<BR><B>Subject:</B> Re: [vtk-developers] contour lines and scalar color plot
issues with vtkUnstructuredGrid<BR></FONT><BR></DIV>
<DIV></DIV><BR><BR>
<DIV><SPAN class=gmail_quote>On 2/15/06, <B class=gmail_sendername>Burlen</B>
<<A href="mailto:burlen@apollo.sr.unh.edu">burlen@apollo.sr.unh.edu</A>>
wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid"><BR>It
seems to me that the problem of open contours might be caused by
the<BR>algorithm(s) used with unstructuredGrids built with the append
filter. Could<BR>it have somehting to do with the fact that the boxes in my
case are appended <BR>in a "willy nilly" order? adjacent boxes aren't
necessarily appended one<BR>after the other.<BR><BR></BLOCKQUOTE></DIV><BR>I
think this is the cause of your problem. The vtkAppendFilter does not
"stitch" neighboring datasets along their boundaries, it keeps each dataset as
an individual piece. So when you extract an isosurface from the combined
dataset, there is no connectivity along those inter-dataset boundaries,
leading to the "discontinuity" along the edges. I've run into the same
issue here doing similiar things (reading a multi-block Plot3d file &
using AppendDataset to only have 1 vtkDataSet to pass around). <BR><BR>How to
fix this? I haven't the slightest, short of writing custom code to
replace vtkAppendDataset and do the stitching. You may be able to
Resample the Data into a rectilinear form (use the ProbeFilter with an
ImageData input), and then get the Isosurface you want, but you'll have to
live with the resolution tradeoffs. It'll also be sloooooow.... <BR><BR
clear=all><BR>-- <BR>Randall Hand<BR>Visualization Scientist, <BR>ERDC-MSRC
Vicksburg, MS<BR>Homepage: <A
href="http://www.yeraze.com">http://www.yeraze.com</A>
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