three.js/examples/models/collada/test/polygons_concave.dae

<?xml version="1.0" encoding="utf-8"?>
<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
  <asset>
    <created>2026-03-09T12:30:00Z</created>
    <modified>2026-03-09T12:30:00Z</modified>
    <unit name="meter" meter="1.0"/>
    <up_axis>Y_UP</up_axis>
  </asset>
  <library_geometries>
    <geometry id="ConcaveGeom" name="ConcaveL">
      <mesh>
        <source id="Concave-pos">
          <float_array id="Concave-pos-array" count="18">
             0.0 0.0 -1.0
            -1.0 0.0 -1.0
            -1.0 0.0  1.0
             2.0 0.0  1.0
             2.0 0.0  0.0
             0.0 0.0  0.0
          </float_array>
          <technique_common>
            <accessor source="#Concave-pos-array" count="6" stride="3">
              <param name="X" type="float"/>
              <param name="Y" type="float"/>
              <param name="Z" type="float"/>
            </accessor>
          </technique_common>
        </source>
        <vertices id="Concave-vertices">
          <input semantic="POSITION" source="#Concave-pos"/>
        </vertices>
        <polygons count="1">
          <input semantic="VERTEX" source="#Concave-vertices" offset="0"/>
          <p>0 1 2 3 4 5</p>
        </polygons>
      </mesh>
    </geometry>
  </library_geometries>
  <library_visual_scenes>
    <visual_scene id="Scene">
      <node id="ConcaveNode">
        <instance_geometry url="#ConcaveGeom"/>
      </node>
    </visual_scene>
  </library_visual_scenes>
  <scene>
    <instance_visual_scene url="#Scene"/>
  </scene>
</COLLADA>