Let me see if I can grok your problem.

1. The data in the <points>...</points> element is a list of points in 3-space. You are only interested in the first two coordinates, so you are treating them as points in 2-space (or ordered pairs). These coordinates represent the vertices of a polygon (inferred by the name of your variable.)

2. Each <tag>...</tag> element specifies two polygons (or perhaps even more than two), and they are given names specified by the <name>...</name> element.

3. Given two polygons, p1 and p2, you want to call a function, f(e1, e2), on all pairs of edges where e1 is an edge of p1 and e2 is an edge of p2. An edge of a polygon is defined by two adjacent vertices of the polygon.

Is this essentially what you are trying to do?

In reply to Re: Subroutine Subtrefuge by pc88mxer
in thread Subroutine Subtrefuge by AF_One

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.