I'm trying to visualize the propagation of heat in a discrete sphere surface. The sphere is hollow, only the voxels of the boundary have value.

Visualization in matlab using isosurface shows correct color over the surface.

I would like to show iso-contours over this visualization but this is difficult in matlab. Searching for alternatives to visualize the data I've found python + numpy + mayavi2 and immediately fell in love with them.

Playing with maiavi I can obtain my desired kind of plots with parametric surfaces but I cannot reproduce the same results with my volumetric, discrete sphere. The following code,

lines = [0.1, 0.3, 0.5, 0.7, 1, 1.5, 1.8, 2.3, 2.8, 3.0, 3.1]

only shows uniform color sphere. Enabling contours or not, does not change the result. No iso-heat lines nor even color over the surface

Anyone knows the correct approach to show the iso-heat contours?

  • $\begingroup$ What is the variable heatmap here? A scalar field? If so, you are seeing the sphere associated with the outermost isocontour. $\endgroup$
    – meawoppl
    Commented Jun 10, 2012 at 7:28

1 Answer 1


Probably you should have a look at the example in the Mayavi2 docs. This should help you.

I haven't done it in a while, but I remember that one of the important issues was to get the data into a useful structured grid.


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