An example Collada file

cube.dae

<?xml version="1.0" encoding="UTF-8"?>
<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
 <asset>
  <contributor>
   <authoring_tool>SceneKit Collada Exporter v1.0</authoring_tool>
  </contributor>
  <created>2018-10-25T16:29:03Z</created>
  <modified>2018-10-25T16:29:03Z</modified>
  <unit meter="1.000000"/>
  <up_axis>Y_UP</up_axis>
 </asset>

 <library_materials>
  <material id="Blue" name="Blue">
   <instance_effect url="#effect_Blue"/>
  </material>
 </library_materials>


 <library_effects>
  <effect id="effect_Blue">
   <profile_COMMON>
    <technique sid="common">
     <phong>
      <ambient>
       <color>0 0 0 1</color>
      </ambient>
      <diffuse>
       <color>0.137255 0.403922 0.870588 1</color>
      </diffuse>
      <specular>
       <color>0.5 0.5 0.5 1</color>
      </specular>
      <shininess>
       <float>16</float>
      </shininess>
      <transparent opaque="A_ONE">
       <color>0 0 0 1</color>
      </transparent>
      <transparency>
       <float>1</float>
      </transparency>
      <index_of_refraction>
       <float>1</float>
      </index_of_refraction>
     </phong>
    </technique>
   </profile_COMMON>
   <!-- <extra>
    <technique profile="SceneKit">
     <litPerPixel>1</litPerPixel>
     <ambient_diffuse_lock>1</ambient_diffuse_lock>
    </technique>
   </extra> -->
  </effect>
 </library_effects>


 <library_geometries>
  <geometry id="F1" name="Face1Geometry">
   <mesh>

    <source id="cube-vertex-positions">
     <float_array id="ID2-array" count="72">-50 50 50 -50 -50 50 50 -50 50 50 50 50 -50 50 50 50 50 50 50 50 -50 -50 50 -50 -50 -50 -50 50 -50 -50 50 -50 50 -50 -50 50 -50 50 50 -50 50 -50 -50 -50 -50 -50 -50 50 50 -50 50 50 -50 -50 50 50 -50 50 50 50 50 50 -50 50 -50 -50 -50 -50 -50 -50 50 -50 </float_array>
     <technique_common>
      <accessor source="#ID2-array" count="24" stride="3">
       <param name="X" type="float"/>
       <param name="Y" type="float"/>
       <param name="Z" type="float"/>
      </accessor>
     </technique_common>
    </source>

    <vertices id="cube-vertices">
     <input semantic="POSITION" source="#cube-vertex-positions"/>
    </vertices>

    <triangles count="12" material="geometryElement5">
     <input semantic="VERTEX" offset="0" source="#cube-vertices"/>
     <p>0 1 2 0 2 3 4 5 6 4 6 7 8 9 10 8 10 11 12 13 14 12 14 15 16 17 18 16 18 19 20 21 22 20 22 23 </p>
    </triangles>
    
   </mesh>
  </geometry>
 </library_geometries>
 <library_visual_scenes>


  <visual_scene id="reportScene">
  <!-- No Spaces allowed in Name -->
   <node id="F1" name="Face1">
    <instance_geometry url="#F1">
     <bind_material>
      <technique_common>
       <instance_material symbol="geometryElement5" target="#Blue"/>
      </technique_common>
     </bind_material>
    </instance_geometry>
   </node>
  </visual_scene>
 </library_visual_scenes>


 <scene>
  <instance_visual_scene url="#reportScene"/>
 </scene>


</COLLADA>