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This script creates a bunch of random points with random scalar data
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and then shows these as a "scatter" plot of points. The script
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1. create a dataset easily using tvtk and numpy,
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2. use a created dataset in Mayavi and visualize it.
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This example achieve the same functionnality as mlab's points3d
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creating the objects and adding them to the pipeline engine via the Mayavi
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core API. Compared to using mlab, this method has the advantage of giving
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more control on which objects are created, and there life cycle.