The ATLAS robot COLLADA/DAE models have invalid texture references.

[keskival]

tero@LeCun:~/git/roboschool/roboschool/models_robot/atlas_description/meshes_unplugged$ grep png *
l_foot.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
l_lglut.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
l_lleg.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
l_talus.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
ltorso.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
l_uglut.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
l_uleg.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
mtorso.dae:    <image id="Map #0-image" name="Map #0"><init_from>../materials/textures/torso_diffuse.png</init_from></image>
r_clav.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
r_foot.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
r_lglut.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
r_lleg.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
r_scap.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
r_talus.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
r_uarm.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
r_uglut.dae:    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
tero@LeCun:~/git/roboschool/roboschool/models_robot/atlas_description/meshes_unplugged$ ls ../materials/textures/*.png
ls: cannot access '../materials/textures/*.png': No such file or directory

Additionally the texture references from inside diffuse tags reference the images in the library directly:

            <diffuse>
              <texture texture="Map #3-image" texcoord="CHANNEL0">

referencing directly to these element ids:

  <library_images>
    <image id="Map #2-image" name="Map #2"><init_from>../materials/textures/extremities_diffuse.png</init_from></image>
    <image id="Map #3-image" name="Map #3"><init_from>../materials/textures/extremities_diffuse_unplugged.jpg</init_from></image>
  </library_images>

This seems to be against COLLADA spec, as per this comment here: KhronosGroup/OpenCOLLADA#92 (comment)

The above two problems make it impossible to import the DAE model files to Blender. Fixing the above problems by removing the invalid texture references by hand makes the import possible without the textures of course.