Parsing <source> with <int_array>

[EtaLoop]

Hello, I tried to parse this collada file with in mesh \, but Document::from_file return Other("parse error"). I visualized it on online viewer so I guess the file is correct.

File:

<?xml version="1.0" encoding="utf-8"?>
<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <asset>
    <contributor>
      <author>Blender User</author>
      <authoring_tool>Blender 2.79.0 commit date:2018-03-22, commit time:14:10, hash:f4dc9f9d68b</authoring_tool>
    </contributor>
    <created>2018-11-19T22:54:36</created>
    <modified>2018-11-19T22:54:36</modified>
    <unit name="meter" meter="1"/>
    <up_axis>Z_UP</up_axis>
  </asset>
  <library_images/>
  <library_effects>
    <effect id="Material-effect">
      <profile_COMMON>
        <technique sid="common">
          <phong>
            <emission>
              <color sid="emission">0 0 0 1</color>
            </emission>
            <ambient>
              <color sid="ambient">0 0 0 1</color>
            </ambient>
            <diffuse>
              <color sid="diffuse">0.64 0.64 0.64 1</color>
            </diffuse>
            <specular>
              <color sid="specular">0.5 0.5 0.5 1</color>
            </specular>
            <shininess>
              <float sid="shininess">50</float>
            </shininess>
            <index_of_refraction>
              <float sid="index_of_refraction">1</float>
            </index_of_refraction>
          </phong>
        </technique>
      </profile_COMMON>
    </effect>
  </library_effects>
  <library_materials>
    <material id="Material-material" name="Material">
      <instance_effect url="#Material-effect"/>
    </material>
  </library_materials>
  <library_geometries>
    <geometry id="Cube_001-mesh" name="Cube.001">
      <mesh>
        <source id="Cube_001-mesh-positions">
          <int_array id="Cube_001-mesh-positions-array" count="24">-1 -1 -1 -1 -1 0.5 -1 0.5 -1 -1 0.5 0.5 0.5 -1 -1 0.5 -1 0.5 0.5 0.5 -1 0 0 0</int_array>
          <technique_common>
            <accessor source="#Cube_001-mesh-positions-array" count="8" stride="3">
              <param name="X" type="float"/>
              <param name="Y" type="float"/>
              <param name="Z" type="float"/>
            </accessor>
          </technique_common>
        </source>
        <source id="Cube_001-mesh-normals">
          <int_array id="Cube_001-mesh-normals-array" count="18">-1 0 0 0 1 0 1 0 0 0 -1 0 0 0 -1 0 0 1</int_array>
          <technique_common>
            <accessor source="#Cube_001-mesh-normals-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="Cube_001-mesh-vertices">
          <input semantic="POSITION" source="#Cube_001-mesh-positions"/>
        </vertices>
        <triangles material="Material-material" count="12">
          <input semantic="VERTEX" source="#Cube_001-mesh-vertices" offset="0"/>
          <input semantic="NORMAL" source="#Cube_001-mesh-normals" offset="1"/>
          <p>1 0 2 0 0 0 3 1 6 1 2 1 7 2 4 2 6 2 5 3 0 3 4 3 6 4 0 4 2 4 3 5 5 5 7 5 1 0 3 0 2 0 3 1 7 1 6 1 7 2 5 2 4 2 5 3 1 3 0 3 6 4 4 4 0 4 3 5 1 5 5 5</p>
        </triangles>
      </mesh>
    </geometry>
  </library_geometries>
  <library_controllers/>
  <library_visual_scenes>
    <visual_scene id="Scene" name="Scene">
      <node id="Cube" name="Cube" type="NODE">
        <matrix sid="transform">1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1</matrix>
        <instance_geometry url="#Cube_001-mesh" name="Cube">
          <bind_material>
            <technique_common>
              <instance_material symbol="Material-material" target="#Material-material"/>
            </technique_common>
          </bind_material>
        </instance_geometry>
      </node>
    </visual_scene>
  </library_visual_scenes>
  <scene>
    <instance_visual_scene url="#Scene"/>
  </scene>
</COLLADA>

[digama0]

The parser is complaining that your int_array contains a -1 in it, which is arguably an integer... but the array also contains a 0.5 later, which doesn't look very integral. I think blender is in the wrong here.

I have some files generated from blender 2.93 and in the same position it will use <float_array> instead of <int_array>, and from both the data in the array and the type="float" references to it I'm quite sure this is a bug in blender, that appears to have since been fixed.

[EtaLoop]

I apologize, I was blinded by the fact that I could visualize it, so I thought it was correct. I replaced 0.5 by 0. As you said, the parser is complaining about -1 in the array (positive numbers works).

[digama0]

Unfortunately a lot of visualizers and importers are somewhat lax, which contributes to the sorry state of specification compliance in the wild. This crate is very near to a collada validator, although I have made some compromises when some "too big to fail" exporter is making wrong .dae files and bug reports to the exporter go nowhere (e.g. 3ds max).