create first version of multiverse usd extractor

openpype/hosts/maya/plugins/publish/extract_multiverse_usd.py

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+import os
+
+import avalon.maya
+import openpype.api
+
+from maya import cmds
+
+
+class ExtractMultiverseUsd(openpype.api.Extractor):
+    """Extractor for USD by Multiverse."""
+
+    label = "Extract Multiverse USD"
+    hosts = ["maya"]
+    families = ["usd"]
+
+    def process(self, instance):
+        # Load plugin firstly
+        cmds.loadPlugin("MultiverseForMaya", quiet=True)
+
+        # Define output file path
+        staging_dir = self.staging_dir(instance)
+        file_name = "{}.usd".format(instance.name)
+        file_path = os.path.join(staging_dir, file_name)
+        file_path = file_path.replace('\\', '/')
+
+        # Perform extraction
+        self.log.info("Performing extraction ...")
+
+        with avalon.maya.maintained_selection():
+            members = instance.data("setMembers")
+            members = cmds.ls(members,
+                              dag=True,
+                              shapes=True,
+                              type=("mesh"),
+                              noIntermediate=True,
+                              long=True)
+
+            # TODO: Deal with asset, composition, overide with options.
+            import multiverse
+            options = multiverse.AssetWriteOptions()
+            multiverse.WriteAsset(file_path, members, options)
+
+        if "representations" not in instance.data:
+            instance.data["representations"] = []
+
+        representation = {
+            'name': 'usd',
+            'ext': 'usd',
+            'files': file_name,
+            "stagingDir": staging_dir
+        }
+        instance.data["representations"].append(representation)
+
+        self.log.info("Extracted {} to {}".format(instance, file_path))