Adapter.xml

<?xml version="1.0" encoding="UTF-8"?>
<Adapter>
  <transform> 
    <!-- will fill out a static matrix in class Model
        can be translate:[x,y,z] 
        or rotate:[axis:char in {x,y,z}: angle in radians]
        transform multiplication will be matrix * position vector (i.e. a 1 column matrix) -->
    <translate>
      <x>100</x>
      <y>100</y>
      <z>0</z>
    </translate>
  </transform>

  <section id="bigcanouter" type="cylinder">
    <radius>6</radius>
    <norm>1</norm>
    <!-- the norm aligns the radius of the cylinder with the surface normal
        think of it as a scaler multiplied by the normalized radius vector
        that will equal the surface normal of the cylinder
        (probably not the normal of the approximating triangles)
        if [+]1 the surface is convex: it curves out, 
        if -1 the surface is concave: it curves in -->
    <error>.2</error>
    <first_circle>
      <ctr>
        <x>0</x>
        <y>0</y>
        <z>0</z>
      </ctr>
    </first_circle>
    <last_circle>    
      <ctr>
        <x>0</x>
        <y>0</y>
        <z>10</z>
      </ctr>
    </last_circle>
    <!-- 2 vectors from circles: axleHAT=(last-first)normalized, NHAT=-axleHAT 
        using NHAT(x,y,z) calculate: 1)w=sqrt(sqr(x)+sqr(z)), 2)X=x/w or 0, 3)Z=z/w or 1
        get 2 basis vectors: IHAT=(Z,0,-X), JHAT=(-yX,w,-yZ)
        by rotating i,j&k -alpha about x axis and then +phi about y axis -->
    <!-- the angles, if present, represent segments parallel to the axle
        if the angles are not included, the arcs will be full rotations
        the arc approximations will be along axleHAT separated by error units
        they will use an equilateral polygonal section with enough sides to keep the distance to 
        one of the circles described below less than the error value
        if the norm is [+]1 the circle used will be the circle circumscribing the polygon
        if the norm is -1 the circle used will be the circle inscribed in the polygon
        the arcs will be staggered along the axle so that the evens and odds start at delta_angle/N or delta_angle/2N-->
  </section>

  <section id="bigcaninner" type="cylinder">
    <radius>4</radius>
    <norm>-1</norm>
    <error>.2</error>
    <first_circle><ctr><x>0</x><y>0</y><z>0</z></ctr></first_circle>
    <last_circle><ctr><x>0</x><y>0</y><z>10</z></ctr></last_circle>
  </section>

  <section id="littlecanouter" type="cylinder">
    <radius>4.5</radius>
    <norm>1</norm>
    <error>.2</error>
    <first_circle><ctr><x>0</x><y>0</y><z>11</z></ctr></first_circle>
    <last_circle><ctr><x>0</x><y>0</y><z>21</z></ctr></last_circle>
  </section>

  <section id="littlecaninner" type="cylinder">
    <radius>2.5</radius>
    <norm>-1</norm>
    <error>.2</error>
    <first_circle><ctr><x>0</x><y>0</y><z>11</z></ctr></first_circle>
    <last_circle><ctr><x>0</x><y>0</y><z>21</z></ctr></last_circle>
  </section>

  <section id="bigcancover" type="plane">
    <norm>-k</norm>
    <multiplyer>0</multiplyer>
    <!-- the origin for the plane is multiplyer * norm -->
    <verts>
      <lookup>
          <section_from>bigcanouter</section_from>
          <section_part>first_circle</section_part>
      </lookup>
    </verts>
    <verts type="first">
      <lookup>
          <section_from>bigcaninner</section_from>
          <section_part>first_circle</section_part>
      </lookup>
    </verts>
  </section>

  <section id="littlecancover" type="plane">
    <norm>k</norm>
    <multiplyer>21</multiplyer>
    <!-- the origin for the plane is multiplyer * norm -->
    <verts>
      <lookup>
          <section_from>littlecanouter</section_from>
          <section_part>last_circle</section_part>
      </lookup>
    </verts>
    <verts type="first">
      <lookup>
          <section_from>littlecaninner</section_from>
          <section_part>last_circle</section_part>
      </lookup>
    </verts>
  </section>

  <section id="outer_patch" type="patch">
      <cylinder_from>bigcanouter</cylinder_from>
      <cylinder_part>last_circle</cylinder_part>
      <section_to>littlecanouter</section_to>
      <section_part>first_circle</section_part>
  </section>

  <section id="inner_patch" type="patch">
      <cylinder_from>bigcaninner</cylinder_from>
      <cylinder_part>last_circle</cylinder_part>
      <section_to>littlecaninner</section_to>
      <section_part>first_circle</section_part>
  </section>


</Adapter>