On Fri, Apr 15, 2011 at 3:54 PM, John Hunter <jdh2...@gmail.com> wrote:
>
>
> On Fri, Apr 15, 2011 at 3:42 PM, Benjamin Root <ben.r...@ou.edu> wrote:
>
>>
>> There might be a possible work-around, though. Maybe (and I am just
>> speculating here) if we can get the core part of matplotlib to specially
>> treat 3d collection objects in such a way that allows the collection to
>> return provide elements and z-order pairs. It is either that, or we finally
>> try to get OpenGL working again in matplotlib and allow ourselves to specify
>> coordinates in 3-D.
>>
>>
> It should be fairly easy to get a collections object to support multiple
> z-orders *within* the collection. Across artists, damn near impossible. I
> don't think you need to provide elements and z-order pairs per-se. The
> typical way a property is specified for a collection if you want it to vary
> over the elements of the collection is that the property is a sequence, and
> the property is accessed as prop[i%N] where i is the element number and N is
> the length of the property vector. So if we make zorder a len(elements)
> sequence of z-orders, we can order the collection by the zorder at draw
> time. Presumably external code would modify the zorder of the collection
> before each draw depending on the view.
>
Within a collection, this is already done correctly (or at least, as well as
one can except with a 2D rendering engine). It is when you have multiple
artists that exists over parts of the z-order "axis" that there are
problems. Essentially, if the 3-D bounding boxes overlap, then trouble
ensues.
Also, that speculation I had wouldn't work either, as the problem still
would exist for intersecting patches. No, what we really need is a 3D
rendering engine, and a logical separation between z-order for
sorting/layering and z-coordinates.
Ben Root
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