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/usr/share/dx/samples/scripts/ShowPositions is in dxsamples 4.2.0-1.

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   // Import the data
electrondensity = Import("watermolecule");
   // Partition the data
electrondensity = Partition(electrondensity);
   // Create a camera
camera = AutoCamera(electrondensity,"off-diagonal");
   // Show all the positions in the data
positions = ShowPositions(electrondensity);
   // Color the positions. 
colored = AutoColor(positions);
   // Display the result
Display(colored,camera);

   // Compare to true volume rendering
colored = AutoColor(electrondensity,intensity=3);
Display(colored,camera);