[vtkusers] Volume rendering problems

[Massimo Ivani]

Dr. Avila,
 
I use vtk and Activiz since about one year reading RX images to create 3D
model using vtkContourFilter. Now I would like to use Volume Rendering but I
have some problem. I have axials in BMP format (8 Bit or 24 Bit) and I have
to read them and show them using volume rendering technique. If I read them
and create a contour all is ok and I got picture1; if I read them and I use
vtkOpenGLVolumeTextureMapper2D I got strange result as you can see in
picture2. If I use ironprot.vtk or "fullhead" demo file, it works well. Here
the source code...
 
Dim VOI As New vtkBMPReader
 
DimPX! = AxialDimPixelX
DimPY! = AxialDimPixelY
DimPZ! = AxialDimPixelZ
DimZ& = AxialDimZ
Wd$ = AxialPathName
Rt$ = AxialFilePrefix
Fp$ = AxialFilePattern
 
With VOI
    .SetDataByteOrderToLittleEndian
    .SetDataSpacing DimPX!, DimPY!, DimPZ!
    .SetFilePrefix Wd$ + Rt$
    .SetFilePattern Fp$
    .SetDataExtent 0, 0, 0, 0, 1, DimZ&
    .SetDataOrigin 0, 0, 0
    .Update
End With
   
Dim Pws As New vtkPiecewiseFunction
    Pws.SetMaximumNumberOfPieces 2
    Pws.AddPoint 0, 0
    Pws.AddPoint 255, 0.2
    Pws.Update
 
Dim CTF As New vtkColorTransferFunction
    CTF.AddRGBPoint 0, 0, 0, 0
    CTF.AddRGBPoint 64, 1, 0, 0
    CTF.AddRGBPoint 128, 0, 0, 1
    CTF.AddRGBPoint 192, 0, 1, 1
    CTF.AddRGBPoint 255, 0, 0.2, 0
 
Dim VolPr As New vtkVolumeProperty
    VolPr.SetColor_2 CTF
    VolPr.SetScalarOpacity Pws
    VolPr.SetInterpolationTypeToLinear
 
Dim VolMapper As New vtkOpenGLVolumeTextureMapper2D
    VolMapper.SetInput VOI.GetOutput
 
Dim Volume As New vtkVolume
    Volume.SetMapper VolMapper
    Volume.SetProperty VolPr
 
Ren1.AddProp Volume
'*************************************
 
 
Thank you in advance for your help.
 
 
Dr. Massimo Ivani
Media Lab Software
Ph. (+39) 0187517775
Fax (+39) 0187511833
 <mailto:massimo.ivani at mlsw.com> massimo.ivani at mlsw.com
 
 
 
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