On Mon, Nov 22, 2010 at 11:44 AM, Miguel Costa <migueldiasco...@gmail.com>wrote:
> Hello all.
>
> I'm attempting to use bar3d to plot a packing solution but from some
> viewpoints the perspective is wrong (boxes seem overlapped), and with a
> large number of boxes the plot is always incoherent.
>
> (I'm using matplotlib 1.0.0 on fedora 14)
>
> Does anyone know how to fix this?
>
> Cheers,
> Miguel
>
>
Miguel,
This is a known issue with mplot3d. The issue is that the polygons are
essentially abstracted 2-D objects that are using the same backend
architecture as the core 2-D plotting software. I think your example script
is probably the *best* example of the problem that I have seen and does a
very good job of illustrating the problem.
The crux of the problem is that each polygon is assigned a z-order for
layering, and this z-order is determined by (i think) the center-of-mass
location of the polygon and how it relates the location of the centers of
mass of the other objects. In most graphing situations, this is a good
enough hack, but there are too many use-cases where it falls apart.
Because we are limited to a single z-order value for each object, and
compositing is done through a 2-D rendering engine, this problem will likely
not get solved any time soon, unfortunately. The fix would probably require
a complete rewrite of the mpl drawing engine or maybe the utilization of
OpenGL?
Sorry I can't be more helpful in fixing your problem, it has been a
aggravating issue for me as well. Thank you for your excellent example
script.
Ben Root
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