[vtkusers] why the color of actor is white by seting the vtkLookupTable

[Bill Lorensen]

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
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>
>
>
> --
> 祝
> 工作愉快，身体健康！
>