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