[vtkusers] vtkVolumeRayCastMapper with float or double scalar

[Jim]

Hi vktusers,
 
I am trying to volume-render a double-precision scalar with vtkVolumeRayCastMapper. 
My raw data (scalar data) are double-precision numbers and they can be negative. I created 
my vtkImageData from unstructured scalar data using vtkShepardMethod. My questions are
 
1) Do I have to scale my raw scalar data to the range of [0, 255] before creating my 
    vtkImageData?
2) What does vtkImageCast->SetOutputScalarTypeToUnsignedShort() do if my ImageData 
    is not scaled to the range of [0, 255]? Will it set any number less than 0 to 0, any 
    number greater than 255 to 255?
 
Thank you.
 
Jim

		
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