[SciPy-User] Question about the position and orientation of the 2dcircle in Mayavi's quiver3d plotting function

[Martin van Leeuwen]

Dear Python users,

I am using the Mayavi toolkit quite a bit, because it is a very nicely
packaged 3D visualization toolkit. I use it mainly for displaying triangle
meshes and point cloud data, but recently I found it necessary to visualize
disks as well. The mayavi.mlab.quiver3d() function seems to be adequate for
this, however its '2dcircles' are oriented contrary to what I expected. I
expected that these 2dcircles would be oriented so that their normal
vectors would point in the direction that a normal '2darrow' would point
to, but it doesn't. Instead, the normal vector of the 2dcircle is
orthogonal to the direction of the 2darray. In addition the 2dcircle is not
centered on the 3D point (specified by the x,y,z input arrays), but touches
it. Is there a way around this? Or is there another function I overlooked
that centers the circles onto a 3D coordinate?

Thanks in advance! Any help is appreciated.

Martin
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