[Paraview] How to do volume rendering of image data?

[Steve Huntley]

I tried a hackish solution to my problem by hand-crafting a version of 
my vtk file which moved all the rgb data to a lookup table, and 
converted the COLOR_SCALARS data set to a SCALARS set whose values are 
indexes into the lookup table.  I set the opacity of each color to 1.0, 
except black which was set to 0.0.  This in theory (as I currently 
understand it) should have given me what I want.

The file opens in ParaView without error; however, it appears that the 
lookup table is simply ignored, and the default color mapping is used 
instead.

The custom vtk file is attached, in case anyone cares to take a look at 
it and tell me if there's problem which causes ParaView to ignore the 
lookup values, or if the behavior in this case is a bug.

Thanks,
Steve H.

Steve Huntley wrote:
> Attached is a small sample vtk file that illustrates the problem. It 
> is a rough representation of a human molar composed originally of 13 
> jpeg image slices, processed into a raw file with ImageJ, then saved 
> to vtk by Paraview.
>
> When I open the file in Paraview 3.2 I see a black block when I choose 
> volume representation. The information tab describes it as a uniform 
> rectilinear grid and shows number of points and cells, just like the 
> info tab of the sample wavelet object described by Utkarsh does.
>
> When I open it in Paraview 3.8, the statistics entries in the 
> information tab are blank, and when I try to choose volume 
> representation I get the error mentioned below.
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