I have worked in highschool on a project "Beam tracing" where I had to
subdivide triangles from a certain point of view with z-ordering and with
such a subdivision how they are covered by the viewing beam. This means
this engine you want to write already exists. See the following ascii
graphics:
+------------+
| /
| 1 /
| /
| +-----/------+
| \ 2 / /
| \ / /
| / 3 /
| / \ /
| / \ /
| / \/
| /
|/
Say that 1 is in front of 2 + 3. Then the engine will leave 1 unchanged,
will discard 2, and will subdivide 3 into a number of sub-triangles, which
comprise 3 exactly.
Don't know whether you are interested in the tringles at all or only in the
pathes of their contours.
The engine assumes that the sets of points comprising the sufaces of the
triangles are disjoint.
Friedrich
2010/2/25 Reinier Heeres <rein...@heeres.eu>:
> Hi all,
>
> I'll mention again that I intend to continue supporting mplot3d,
> although help would be greatly appreciated.
>
> I think the z-ordering issues are in the end quite hard to tackle,
> especially since we can have different kinds of structures in a plot,
> e.g. polygons and lines (or rather: curves).
>
> John's suggestion of a global polygon list would indeed be a good way
> forward, and I will think about implementing this soon. However, the
> next step of finding intersecting polygons and breaking them properly
> could be quite slow if implemented in pure python. So I'm not sure
> whether our goal should be to create a full 3d engine...
>
> Cheers,
> Reinier
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