[vtkusers] why the color of actor is white by seting the vtkLookupTable
朱文武
cool.wenwu at gmail.com
Sat Apr 17 12:21:58 EDT 2010
bill, i also think that the DecimatePro destroys the cell scalar data.
The example you provide is good, and what i want is render all the structure
in the dataset.
I record it ! Though, i do not understand them totally.
thanks
wenwu
On Sat, Apr 17, 2010 at 8:14 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:
> This makes sense to me. DecimatePro removes cells and in doing so
> destroys the cell scalar data. Another alternative is to split the
> cubes generated polydata into separate polydata using vtkThreshold.
> Look at the example:
> http://www.vtk.org/Wiki/VTK/Examples/Medical/Cxx/GenerateModelsFromLabels
>
> Bill
>
> On Sat, Apr 17, 2010 at 6:09 AM, 朱文武 <cool.wenwu at gmail.com> wrote:
> > hey, bill, thanks very much ! I find the culprit !
> > Firstly, i try mapper->SetInput(cube->GetOutput()). And, the result is
> > satisfactory. I reach the destination. So, i think there are must be some
> > problems in the pipeline.
> > Secondely, i remove the vtkDecimatePr from the pipeline, and surprisedly
> > find that the the actor is colored correctly. And if this class is put
> back,
> > the result is opposite. However, i can not find the reason why this
> class
> > has a bad effect on the color of cells.
> >
> > In conclusion, i remove that class, and the program runs correctly. Your
> > think pattern in solving problems in the vtk programming style is great!
> > Have a good weekend!
> >
> >
> > Thanks
> > Wenwu
> >
> >
> > On Sat, Apr 17, 2010 at 9:49 AM, 朱文武 <cool.wenwu at gmail.com> wrote:
> >>
> >> thanks ,bill! i will try, then tell you the result .
> >>
> >> On Sat, Apr 17, 2010 at 3:53 AM, Bill Lorensen <bill.lorensen at gmail.com
> >
> >> wrote:
> >>>
> >>> Another idea. It seems that one pipeline piece is changing the cell
> >>> data. Try changing the mapper's input to determine which filter is the
> >>> culprit.
> >>>
> >>> Try
> >>> mapper->SetInput(cube->GetOutput());
> >>> first.
> >>>
> >>> Do you get the proper coloring?
> >>>
> >>> bill
> >>>
> >>>
> >>> On Fri, Apr 16, 2010 at 3:39 PM, Bill Lorensen <
> bill.lorensen at gmail.com>
> >>> wrote:
> >>> > Try,
> >>> > smoother->GenerateErrorScalarsOff() ;
> >>> >
> >>> > On Fri, Apr 16, 2010 at 1:30 AM, 朱文武 <cool.wenwu at gmail.com> wrote:
> >>> >> Bill, thanks very much !
> >>> >> Here are the all related codes:
> >>> >> vtkSmartPointer<vtkBMPReader> m_read =
> >>> >> vtkSmartPointer<vtkBMPReader>::New();
> >>> >> m_read->SetFilePrefix("C:/Data/brain/TCVH_");//
> >>> >> m_read->SetFilePattern("%s%d.bmp"); //
> >>> >> m_read->Allow8BitBMPOn();
> >>> >> m_read->SetDataByteOrderToLittleEndian();
> >>> >> m_read->SetFileNameSliceOffset(5);//
> >>> >> m_read->SetFileNameSliceSpacing(1);//
> >>> >> m_read->SetNumberOfScalarComponents(3);//
> >>> >> m_read->SetDataOrigin(0.0,0.0,0.0);//
> >>> >> m_read->SetDataSpacing(0.167*4,0.167*4,1);//
> >>> >> m_read->SetDataExtent(0,299,0,345,1300,1320);//
> >>> >> m_read->Update();
> >>> >>
> >>> >> vtkSmartPointer<vtkDiscreteMarchingCubes> cube =
> >>> >> vtkSmartPointer<vtkDiscreteMarchingCubes>::New() ;
> >>> >> cube->SetInput((vtkDataObject*) m_read->GetOutput() );
> >>> >> cube->SetValue(0, 111);
> >>> >> cube->SetValue(1, 121);
> >>> >> cube->Update() ;
> >>> >>
> >>> >> vtkSmartPointer<vtkDecimatePro> deci =
> >>> >> vtkSmartPointer<vtkDecimatePro>::New();
> >>> >> deci->SetInputConnection(cube->GetOutputPort());//
> >>> >> deci->SetTargetReduction(0.5); //
> >>> >> deci->PreserveTopologyOn(); //
> >>> >> deci->ReleaseDataFlagOn();
> >>> >>
> >>> >> vtkSmartPointer<vtkWindowedSincPolyDataFilter> smoother=
> >>> >> vtkSmartPointer<vtkWindowedSincPolyDataFilter>::New();
> >>> >> smoother->SetInput(deci->GetOutput());
> >>> >> smoother->SetNumberOfIterations(30) ;
> >>> >> smoother->NonManifoldSmoothingOn();
> >>> >> smoother->NormalizeCoordinatesOn();
> >>> >> smoother->GenerateErrorScalarsOn() ;
> >>> >> smoother->Update();
> >>> >>
> >>> >> vtkSmartPointer<vtkLookupTable> colorLookupTable=
> >>> >> vtkSmartPointer<vtkLookupTable>::New();
> >>> >>
> >>> >> colorLookupTable->SetTableRange(0, 122);
> >>> >> colorLookupTable->SetNumberOfTableValues(123);
> >>> >> colorLookupTable->Build();
> >>> >> for (int i =0; i < 111; i++)
> >>> >> {
> >>> >> colorLookupTable->SetTableValue(i , i/255.0, i/255.0,i/255.0);
> >>> >> }
> >>> >> colorLookupTable->SetTableValue(111, 1,0,0,1);
> >>> >> for (int j = 112; j <120; j++)
> >>> >> {
> >>> >> colorLookupTable->SetTableValue(j , j/255.0, j/255.0, j/255.0);
> >>> >>
> >>> >> }
> >>> >> colorLookupTable->SetTableValue(121, 0,1,1,1);
> >>> >> colorLookupTable->SetTableValue(122, 0,1,1,1);
> >>> >>
> >>> >> vtkSmartPointer<vtkPolyDataNormals> triangleCellNormals =
> >>> >> vtkSmartPointer<vtkPolyDataNormals>::New();
> >>> >> triangleCellNormals->SetInput(smoother->GetOutput());
> >>> >> triangleCellNormals->ComputeCellNormalsOn();
> >>> >> triangleCellNormals->ComputePointNormalsOff();
> >>> >> triangleCellNormals->ConsistencyOn();
> >>> >> triangleCellNormals->AutoOrientNormalsOn();
> >>> >> triangleCellNormals->Update() ;
> >>> >>
> >>> >> vtkSmartPointer<vtkPolyDataMapper> mapper =
> >>> >> vtkSmartPointer<vtkPolyDataMapper>::New();
> >>> >> mapper->SetInput(triangleCellNormals->GetOutput()); // #this is
> better
> >>> >> for
> >>> >> vis
> >>> >> mapper->ScalarVisibilityOn() ;//#show colour
> >>> >> mapper->SetScalarRange(colorLookupTable->GetTableRange());
> >>> >> mapper->SetScalarModeToUseCellData() ; // contains the label eg. 31
> >>> >> //mapper->SetScalarModeToUsePointData() ;//#the smoother error
> relates
> >>> >> to
> >>> >> the verts
> >>> >> mapper->SetLookupTable(colorLookupTable);
> >>> >>
> >>> >> vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
> >>> >> actor->SetMapper(mapper);
> >>> >>
> >>> >> Waiting for suggestion, thanks in advance !
> >>> >>
> >>> >> Wenwu
> >>> >>
> >>> >>
> >>> >>
> >>> >> On Fri, Apr 16, 2010 at 12:01 PM, Bill Lorensen
> >>> >> <bill.lorensen at gmail.com>
> >>> >> wrote:
> >>> >>>
> >>> >>> The lookup table and mapper look OK to me. Can you attach the
> entire
> >>> >>> program if it is not too large?
> >>> >>>
> >>> >>> Bill
> >>> >>>
> >>> >>> On Thu, Apr 15, 2010 at 9:00 PM, 朱文武 <cool.wenwu at gmail.com> wrote:
> >>> >>> > hi all,
> >>> >>> >
> >>> >>> > I sent the message last night! However, no one responded !
> >>> >>> > So, i
> >>> >>> > send
> >>> >>> > it again. Please forgive me, if it disrupts you!
> >>> >>> >
> >>> >>> > I use vtkDiscreteMarchingCubes to reconstruct anatomy structure,
> >>> >>> > and use
> >>> >>> > the
> >>> >>> > vtkLookupTable to map the color. Now, i design the color map as
> >>> >>> > follows:
> >>> >>> > gray value (111) to red,
> >>> >>> > gray value(121) to blue.
> >>> >>> > Other gray value I don't care.
> >>> >>> >
> >>> >>> > Also, the parameter I set in SetValue() of
> >>> >>> > vtkDiscreteMarchingCubes is:
> >>> >>> > SetValue(0, 111);
> >>> >>> > SetValue(1, 121);
> >>> >>> >
> >>> >>> > Then i set the lookup table as follows:
> >>> >>> > vtkSmartPointer<vtkLookupTable> colorLookupTable=
> >>> >>> > vtkSmartPointer<vtkLookupTable>::New();
> >>> >>> > colorLookupTable->SetTableRange(0, 122); //
> >>> >>> > colorLookupTable->SetNumberOfTableValues(123);
> >>> >>> > colorLookupTable->Build();
> >>> >>> >
> >>> >>> > for (int i =0; i < 111; i++)
> >>> >>> > {
> >>> >>> > colorLookupTable->SetTableValue(i , i/255.0,
> i/255.0,i/255.0);
> >>> >>> > // i
> >>> >>> > don't care this loop
> >>> >>> > }
> >>> >>> > colorLookupTable->SetTableValue(111, 1,0,0,1); // this is
> essential
> >>> >>> > for
> >>> >>> > me
> >>> >>> > for (int j = 112; j <120; j++)
> >>> >>> > {
> >>> >>> > colorLookupTable->SetTableValue(j , j/255.0, j/255.0,
> j/255.0);
> >>> >>> > // i
> >>> >>> > don't care this loop
> >>> >>> >
> >>> >>> > }
> >>> >>> > colorLookupTable->SetTableValue(121, 0,0,1,1);
> >>> >>> > colorLookupTable->SetTableValue(122, 0,0,1,1);
> >>> >>> >
> >>> >>> > vtkSmartPointer<vtkPolyDataMapper> mapper =
> >>> >>> > vtkSmartPointer<vtkPolyDataMapper>::New();
> >>> >>> > ...
> >>> >>> > mapper->ScalarVisibilityOn() ;//#show colour
> >>> >>> > mapper->SetScalarRange(colorLookupTable->GetTableRange());
> >>> >>> > mapper->SetScalarModeToUseCellData() ;
> >>> >>> > mapper->SetLookupTable(colorLookupTable);
> >>> >>> >
> >>> >>> > The result of construction is that two structures whose gray
> value
> >>> >>> > is
> >>> >>> > 111
> >>> >>> > and 121 were reconstructed.
> >>> >>> > However, the color of these actors is the same- white.
> >>> >>> > Ccould anyone tell me why and give some suggestions?
> >>> >>> >
> >>> >>> > Thanks
> >>> >>> > Wenwu
> >>> >>> > _______________________________________________
> >>> >>> > Powered by www.kitware.com
> >>> >>> >
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> >>> >>> >
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> >>> >>> >
> >>> >>> >
> >>> >>
> >>> >>
> >>> >>
> >>> >> --
> >>> >> 祝
> >>> >> 工作愉快，身体健康！
> >>> >>
> >>> >
> >>
> >>
> >>
> >> --
> >
> >
>
--
祝
工作愉快，身体健康！
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