A resource for volume visualization in Matlab

As many engineers may already know, visualizing scalar or vector volume information is difficult. Examples include the heat distribution in a room (scalar) or the electromagnetic field around a complex-shaped scatterer (vector). There is a good set of resources on how to do so in Matlab here: http://blogs.mathworks.com/videos/2009/10/30/basics-volume-visualization-29-examples-of-scalar-and-vector-fields/. I haven't tried volume visualization with any Python packages (see Python x,y for a collection of useful scientific packages), but if I find the time to play with it, I'll compare and contrast the two.