// Import the data
electrondensity = Import("watermolecule");
    // Partition the data
electrondensity = Partition(electrondensity);
    // Create a camera
camera = AutoCamera(electrondensity,width=3);
    // Create an isosurface at a value of 0.3
isosurface = Isosurface(electrondensity,0.3);
    // Create 2000 samples
samples = Sample(isosurface,200);
    // Show the positions of the samples
samples = ShowPositions(samples);
Display(samples,camera);

    // Compute the gradient of the data
gradient = Gradient(electrondensity);
    // Map the gradient onto the samples
mapped = Map(samples,gradient);
    // Use AutoGlyph to visualize the gradient
glyphs = AutoGlyph(mapped);
Display(glyphs,camera);