Hello,

I am a new plplot user and I am not an expert of this tool.

I am developing a tomographic application to reconstruct the zones, of a 
certain volume, where a certain substance is concentrated.
So I have a function defined on a three-dimensional space

        h(x,y,z)

that gives the concentration at each point (a 3D histogram of the 
concentration).
I want to plot it in a 4D plot with these characteristics:

- the plot space should be divided into voxels.
- each voxel should be colored following a palette, with a transparency that 
decreases with the raising of the concentration.

How can I do this?
I tried to look in the documentation but I found just an utility to plot a 2D 
histogram (exempla gratia a 3D plot of a surface over a cartesian plane).

        Thank you in advance,
        Cristiano
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