meshcat-python Collada loader texture/color hack

DaeMeshFileSetObject.py

class DaeMeshFileSetObject(object):
    def __init__(self, dae_file, meshcat_path_string):
        """
        Assumes that all images are in the same directory as the .dae file
        """
        self.file = pathlib.Path(dae_file).absolute().resolve()
        self.path = meshcat_path_string
        # -- we don't really need to hold on to these but for debugging it'll be nice to keep them
        self.dae_tree = None
        self.file_contents = None
        self.img_resource_names = None
        self.img_resources = {}
        
    def lower(self):
        """
        Shallow preparation of the dict that Meshcat expects from a SetObject 
        to be passed to Visualizer.window.send.
        
        Eventually this needs to make it into my Meshcat fork but I don't want to 
        figure out the object hierarchy yet.
        """
        with self.file.open('r') as daef:
            self.file_contents = daef.read()
        self.dae_tree = Et.parse(self.file)
        # -- parse the image resource filenames out of the .dae file ElementTree --
        img_lib_element = self.dae_tree.find('{http://www.collada.org/2005/11/COLLADASchema}library_images')
        if img_lib_element:
            self.img_resource_names = [e.text for e in img_lib_element.iter() if e.tag.count('init_from')]
        else:
            self.img_resource_names = []
        
        # -- base64 encode each of the images and make them into a URI that the Three.js ColladaLoader can consume --
        for img_name in self.img_resource_names:
            img_path = self.imgdir / img_name
            if not img_path.is_file():
                raise UserWarning(r'DaeMeshFileSetObject.lower() ERROR! Collada image reference {img_path} not found on disk, make sure texture images are in the same directory as .dae file')
            with img_path.open('rb') as imf:
                imdata = base64.b64encode(imf.read())
            imstr = imdata.decode('utf-8')
            imuri = f'data:image/png;base64,{imstr}'
            self.img_resources[img_name] = imuri
        
        #mat_uuid = str(uuid.uuid1())
        # -- pack this all manually into a dictionary of the right format --
        objd = {
                u'type':u'set_object', #this is a command I guess?
                u'path':self.path,
                u'object':{
                    u'metadata':{'version':4.5, u'type':u'Object'},
                    u'geometries':[],
                    u'materials': [],
                    u'object':{
                        u'uuid':str(uuid.uuid1()),
                        u'type':u'_meshfile_object',
                        u'format':u'dae',
                        u'data':self.file_contents,
                        #u'material':mat_uuid,
                        u'resources':self.img_resources
                              }

                         }
                }
        
        return objd