[vtkusers] Problem of ScalarType after using vtkImageMathematics

[Amy Squillacote]

Hi Alfredo,

Try using vtkImageShiftScale rather than vtkImageCast. It will allow you 
to put the data in the correct range for the output scalar type.

- Amy

Aldredo Gourbish wrote:
> Hi everybody !
>
> I've got a problem after using vtkImageMathematics in order to subtract 2 vtk volumes.
> In fact, the result is quiet good when I render it with vtkOpenGLVolumeTextureMapper3D which supports short ScalarType.
> But when I render the result with vtkOpenGLVolumeTextureMapper2D, it is bad since this mapper only supports UnsignedShort or UnsignedChar ScalarType, and the volume is all white.
> I saw that in fact the ScalarRange of the vtkImageMathematics result is (-15, 35), so I think there is a problem of ScalarRange for vtkOpenGLVolumeTextureMapper2D. I tried to use a vtkImageCast in order to cast the ScalarType to UnsignedShort but there is always the problem.
>
> I hope you understand my problem, and somebody has an idea. I spend a long time searching a solution but with no results !
>
> Thanks in advance,
>
> Alfredo.
>
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-- 
Amy Squillacote
Kitware, Inc.
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