[vtkusers] UnstructuredGrid clip problems

[chen zhao]

Hi,

I am very interested vtk.But a vtk problem bothering me for a long time.

My OS is centos6.3. vtk version 5.10,cmake version is 2.84,ccmake is 2.84.
I have built vtk source successfully and get a vtk.jar.

I have a vtk file(ASCII, UNSTRUCTURED_GRID),I want to cut a part of the
file.The vtk file's information is:

-------------------------------------------------------------------------------------------------
 vtk DataFile Version 2.0
 Result of a test
 ASCII
 DATASET UNSTRUCTURED_GRID

POINTS 2897304 float
...

CELLS 2720061 24480549
...

CELL_TYPES 2720061
...

CELL_DATA 2720061
SCALARS matnumber long
LOOKUP_TABLE default
...

POINT_DATA 2897304
SCALARS srr float
LOOKUP_TABLE default
...

SCALARS stt float
LOOKUP_TABLE default
...

SCALARS spp float
LOOKUP_TABLE default
...

SCALARS stp float
LOOKUP_TABLE default
...

SCALARS srp float
LOOKUP_TABLE default
...

SCALARS srt float
LOOKUP_TABLE default
...

VECTORS desplacement float
...

--------------------------------------------------------------------------------------------------
On the top,it is the vtk file data structure.

My source is following:

*# step 1: read file*
vtkUnstructuredGridReader reader = new vtkUnstructuredGridReader();
reader.SetFileName(fileName);
reader.Update();
vtkUnstructuredGrid output = reader.GetOutput();

*#step 2: create a clipper*
vtkClipDataSet clipper = new vtkClipDataSet();
vtkImplicitBoolean cut = new vtkImplicitBoolean();
cut.SetOperationTypeToIntersection();
/*
new vtkPlane (vtkPlane1,vtkPlane2,vtkPlane3)
*/
cut.AddFunction(vtkPlane1);
cut.AddFunction(vtkPlane2);
cut.AddFunction(vtkPlane3);

clipper.SetInput(output);
clipper.SetClipFunction(cut);
clipper.GenerateClipScalarsOn();
clipper.GenerateClippedOutputOn();
clipper.SetInsideOut(-1);

*#step 3:save clipper data*
vtkUnstructuredGridWriter writer = new vtkUnstructuredGridWriter();
String fileNameWriter = "cutter.vtk";
writer.SetFileName("/work/data/vtk/"+fileNameWriter);
writer.SetInput(clipper.GetOutput());
writer.SetFileTypeToASCII();
writer.Write();

Now I can get the cutter.vtk file,when I open the "cutter.vtk" file by
ParaView,I only find "Solid Color, cellNormals, matnumber,
ClipDataSetScalars displacement" scalars,but in orignal vtk file I

can find "Solid Color, cellNormals, displacement, matnumber, spp, srr, stt,
srp, srt, stp" scalars.So in cutter.vtk file,it added "ClipDataSetScalars"
scalars and removed "spp, stt, srr, srp, srt,

stp" 6 scalars.Why did cutter.vtk remove the 6 scalars and add
"ClipDataSetScalars"?

I want to keep the "spp, stt, srr, srp, srt, stp " scalars,but I don't know
how to do it. Is my source code wrong?

Please advice. The problem is very import for me.

Chen Zhao
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