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

[Randy Heiland]

OK, when I get some time, I'll try a different reader.  But nevertheless, it doesn't explain why my super-simple script, with a super-simple dataset, doesn't work as expected :)

-Randy

On Nov 11, 2011, at 8:19 AM, Bill Lorensen wrote:

> 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
>> 
>> 
>> 
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