[vtkusers] why the color of actor is white by seting the vtkLookupTable
朱文武
cool.wenwu at gmail.com
Sat Apr 17 06:09:22 EDT 2010
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
>> >>> > _______________________________________________
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>> >>> >
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>> >>> >
>> >>> >
>> >>
>> >>
>> >>
>> >> --
>> >> 祝
>> >> 工作愉快，身体健康！
>> >>
>> >
>>
>
>
>
> --
>
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