VTK中的体绘制

吧主，我用面绘想出肺部图像，结果出来一张灰度纸一样的东西可能是存在什么问题呢？

void main() //////////////////面绘////////////////
{
vtkRenderer *aRenderer = vtkRenderer::New();//建立绘制者
vtkRenderWindow *renWin = vtkRenderWindow::New(); //建立绘制窗口
renWin->AddRenderer(aRenderer); //将绘制者加入绘制窗口
renWin->SetSize(512, 512);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(renWin);
vtkVolume16Reader *reader = vtkVolume16Reader::New();
reader->SetDataDimensions(512, 512);//设置图像像素值
reader->SetImageRange(1,90); //设置图片数量
reader->SetDataByteOrderToLittleEndian();//不知道什么鬼
reader->SetFilePrefix("E:\\emphysema M66\\L00");//图片路径
reader->SetFilePattern("%s%d.bmp");
reader->SetDataSpacing(3,3,1);//像素间的间隔
vtkMarchingCubes *skinExtractor = vtkMarchingCubes::New(); //用MarchingCubes绘制曲面
skinExtractor->SetInputConnection(reader->GetOutputPort());
skinExtractor->SetValue(0, 10);//设置阈值，其实为二值图像重建
//vtkDecimatePro *deci = vtkDecimatePro::New(); //减少数据读取点，以牺牲数据量加速交互
//deci->SetTargetReduction(0.9);
//deci->SetInputConnection(skinExtractor->GetOutputPort());
//vtkSmoothPolyDataFilter *smooth = vtkSmoothPolyDataFilter::New(); //使图像更加光滑
//smooth->SetInputConnection(deci->GetOutputPort());
//smooth->SetNumberOfIterations(100);
//vtkPolyDataNormals *skinNormals = vtkPolyDataNormals::New();//绘制法线
//skinNormals->SetInputConnection(skinExtractor->GetOutputPort());
vtkStripper *skinStripper = vtkStripper::New(); //三角带连接
skinStripper->SetInputConnection(skinNormals->GetOutputPort());
vtkPolyDataMapper *skinMapper = vtkPolyDataMapper::New();
skinMapper->SetInputConnection(skinExtractor->GetOutputPort());
//skinMapper->ScalarVisibilityOff();
vtkActor *skin = vtkActor::New();
skin->SetMapper(skinMapper); //获得皮肤几何数据的属性
skin->GetProperty()->SetDiffuseColor(0.38, 0.54, 0.47); //设置皮肤颜色的属性
skin->GetProperty()->SetSpecular(0.4); //设置反射率
skin->GetProperty()->SetSpecularPower(20); //设置反射光强度
skin->GetProperty()->SetOpacity(0.8);//设置透明度
vtkCamera *aCamera = vtkCamera::New(); //定义摄像机
aCamera->SetViewUp(0, 0, -1); //取得摄像机方向
aCamera->SetPosition(0, 1, 0); //光源位置
aCamera->SetFocalPoint(0, 0, 0); //取焦点坐标
//aCamera->ComputeViewPlaneNormal();
aRenderer->AddActor(skin);
aRenderer->SetActiveCamera(aCamera);
aRenderer->ResetCamera();
aCamera->Dolly(1.5); //大于1向摄像机焦点移动小于1则向远离焦点的方向移动
aRenderer->SetBackground(0,0,0);
aRenderer->ResetCameraClippingRange();
/*vtkBoxWidget *boxWidget = vtkBoxWidget::New();
boxWidget->SetInteractor(iren);
boxWidget->SetPlaceFactor(1.25);
boxWidget->SetProp3D(skin);
boxWidget->PlaceWidget();*/
iren->Initialize();
iren->Start();

后来发现改变Y方向的像素间隔是没有反应的，Y轴被吃了！？怎么破

vtkSmartPointer<vtkFixedPointVolumeRayCastMapper> volumeMapper =
vtkSmartPointer<vtkFixedPointVolumeRayCastMapper>::New();
这一句就报错了，是vtk编译的问题吗？