Now actually fixed the bug with the normals.

pyassimp returned a list instead of a numpy array when the normals were
empty. This also applies to texture coordinates and other stuff which is
explicitly converted in _finalize_mesh.

port/PyAssimp/pyassimp/core.py

@@ -313,7 +313,7 @@ def _finalize_mesh(mesh, target):
             data = numpy.array([make_tuple(getattr(mesh, name)[i]) for i in range(nb_vertices)], dtype=numpy.float32)
             setattr(target, name[1:].lower(), data)
         else:
-            setattr(target, name[1:].lower(), [])
+            setattr(target, name[1:].lower(), numpy.array([], dtype="float32"))
 
     def fillarray(name):
         mAttr = getattr(mesh, name)

port/PyAssimp/scripts/sample.py

@@ -43,7 +43,7 @@ def main(filename=None):
         print("    material id:" + str(mesh.materialindex+1))
         print("    vertices:" + str(len(mesh.vertices)))
         print("    first 3 verts:\n" + str(mesh.vertices[:3]))
-        if mesh.normals:
+        if mesh.normals.any():
                 print("    first 3 normals:\n" + str(mesh.normals[:3]))
         else:
                 print("    no normals")