Hi, all <br><br>I use vtkDICOMImageReader read Medical image of DICOM format, and then use vtkDICOMImageReader::SetDataScalarTypeToUnsignedShort() to change the datatype,<br><br>but when I use vtkVolumeRayCastMapper, i got the follow message:
<br>vtkVolumeRayCastMapper(0x02AA83A8): Cannot volume render data of type short, only unsigned char or unsigned short.<br><br>It seems the function SetDataScalarTypeToUnsignedShort() did not work. why? and how can i change the data type into unsinged char? or some other methods to use vtkVolumeRayCastMapper?
<br><br>my code is,<br><br> pvtkDICOMImagereader = vtkDICOMImageReader::New();<br> pvtkDICOMImagereader->SetDirectoryName(directoryname);<br> pvtkDICOMImagereader->SetDataScalarTypeToUnsignedShort();<br> pvtkDICOMImagereader->Update();
<br><br> vtkPiecewiseFunction *opacityTFunc=vtkPiecewiseFunction::New();<br> opacityTFunc->AddPoint(0.0, 0.0);<br> opacityTFunc->AddPoint(scalar1, alphar1);<br> opacityTFunc->AddPoint(scalar2, alphar2);<br> opacityTFunc->AddPoint(scalar3, alphar3);
<br> opacityTFunc->AddPoint(scalar4, alphar4);<br><br><br> vtkVolumeProperty *volumeProperty=vtkVolumeProperty::New();<br> // volumeProperty->SetColor(colorTFunc);<br> volumeProperty->SetScalarOpacity(opacityTFunc);
<br> volumeProperty->SetInterpolationTypeToLinear();<br> volumeProperty->SetAmbient(1.8);//0.2<br> volumeProperty->SetDiffuse(1.0);<br> volumeProperty->SetSpecular(0.7);//0.2<br> volumeProperty->SetSpecularPower(30);
<br> volumeProperty->ShadeOn();<br><br> //<br> vtkVolumeRayCastMIPFunction <br> *compositeFunction=vtkVolumeRayCastMIPFunction::New();<br><br><br> vtkVolumeRayCastMapper *volumeMapper=vtkVolumeRayCastMapper::New();
<br> volumeMapper->SetInput(this->reader->GetOutput());<br> volumeMapper->SetVolumeRayCastFunction(compositeFunction);<br> volumeMapper->SetNumberOfThreads(3);<br> cerr<<volumeMapper->GetNumberOfThreads();
<br><br> vtkVolume *volume=vtkVolume::New();<br> volume->SetMapper(volumeMapper);<br> volume->SetProperty(volumeProperty);<br> this->pvtkRenderer->AddVolume(volume);<br><br><br clear="all"><br>-- <br>veelion