[vtk-developers] Fwd: [vtkusers] coloring vtkDiscreteMarchingCubes

[Bill Lorensen]

Randy,

That example expects the data to be in meta format. You can try
replacing the reader with a vtkDataSetReader.

Bill

On Thu, Nov 10, 2011 at 7:22 PM, Randy Heiland <heiland at indiana.edu> wrote:
> Bill,
> Thanks for your reply.  The wiki link I provided contains my entire, small
> dataset, f_7x4x4_height.vtk, which does indeed consist of integral data
> (just 0s,1s,2s,3s).  And the DMC filter does generate the desired geometry.
>  It's just that when I then try to color it according to another (integral)
> field, it's as if the mapper disregards the color array.
> If there's something I can do to make this easier to test, e.g. provide a
> C++ example instead of Python, I can do that.
>
> I also tried to blindly use VTK's example DMC pgm on my simple dataset, but
> had errors (not surprisingly):
> $ /Users/heiland/dev/vtk-build/vtk-8-2-11/bin/GenerateModelsFromLabels
> ~/dev/vtk-stuff/f_7x4x4.vtk 0 3
> Incomplete file record definition
> NDims required and not defined.
> MetaObject: Read: MET_Read Failed
> MetaImage: M_Read: Error parsing file
> MetaImage: Read: Cannot parse file
> ERROR: In /Users/heiland/Documents/workspace/VTK/IO/vtkMetaImageReader.cxx,
> line 84
> vtkMetaImageReader (0x7f8f29002000): MetaImage cannot parse file.
> Incomplete file record definition
> NDims required and not defined.
> MetaObject: Read: MET_Read Failed
> MetaImage: M_Read: Error parsing file
> MetaImage: Read: Cannot parse file
> ERROR: In /Users/heiland/Documents/workspace/VTK/IO/vtkMetaImageReader.cxx,
> line 224
> vtkMetaImageReader (0x7f8f29002000): MetaImage cannot read data from file.
> ERROR: In
> /Users/heiland/Documents/workspace/VTK/Graphics/vtkDiscreteMarchingCubes.cxx,
> line 292
> vtkDiscreteMarchingCubes (0x7f8f28501bf0): Cannot contour data of dimension
> != 3
> ERROR: In
> /Users/heiland/Documents/workspace/VTK/Graphics/vtkWindowedSincPolyDataFilter.cxx,
> line 112
> vtkWindowedSincPolyDataFilter (0x7f8f285024f0): No data to smooth!
>
> thanks, Randy
>
>
> On Nov 10, 2011, at 6:02 PM, Bill Lorensen wrote:
>
> Randy,
>
> I have not looked at your data yet. But in general, MarchingCubes
> processes continuous data while DiscreteMarchingCubes processes
> integral data, typically created by a segmentation algorithm. T\he two
> algorithms are not normally used on the same datasets. What is the
> character of your data?
>
> Bill
>
> On Tue, Nov 8, 2011 at 7:05 AM, Randy Heiland <heiland at indiana.edu> wrote:
>
> Since I never got a response on the users list, I'll try the dev list.
>
> thanks, Randy
>
> Begin forwarded message:
>
> From: Randy Heiland <heiland at indiana.edu>
>
> Subject: [vtkusers] coloring vtkDiscreteMarchingCubes
>
> Date: November 3, 2011 11:43:12 AM EDT
>
> To: <vtkusers at vtk.org>
>
> Hi all,
>
> I'm puzzled by the following:  if I extract a surface from a 3D dataset
>
> using vtkContourFilter, I can color it according to a different scalar
>
> field; however, if I use vtkDiscreteMarchingCubes, my same pipeline doesn't
>
> color it.
>
> I've put a simple dataset and Python script here (near the bottom):
>
>  http://old.compucell3d.org/mediawiki1.7/index.php/Vtk_contours_3D
>
> and built VTK from git a couple months ago:
>
> In [3]: vtk.vtkVersion.GetVTKVersion()
>
> Out[3]: '5.9.0'
>
>
> thanks, Randy
>
>
>
> _______________________________________________
>
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
>
> http://www.kitware.com/opensource/opensource.html
>
> Follow this link to subscribe/unsubscribe:
>
> http://www.vtk.org/mailman/listinfo/vtk-developers
>
>
>
>
>
>
> --
> Unpaid intern in BillsBasement at noware dot com
>
>



-- 
Unpaid intern in BillsBasement at noware dot com