[vtkusers] Questions to render seismic data by volume render method

[李菲菲]

 I'm trying to render a 3D seismic data by volumetric ray casting. The data is stored in binary, and the data type is float. I read in the data with the class of vtkImageData2 and the dimension of the data is 100x100x201. There are two questions: 
 1 How to choose the points to set opacity and color ? 
 2 As vtkVolumeRayCastMapper can only deal with unsigned char or unsigned short , but the data read in is float. How to deal with this problem?
  
 Many thanks,
 Feifei Li @nscc-tj
  
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