Version 2.1.2: Python bindings, OBJ assets support, bugfixes.

PiperOrigin-RevId: 434731612
Change-Id: I0cfda3e7a3d1c72036764986efc252ffa1b8c6b0

unity/Runtime/Components/Joints/MjFreeJoint.cs

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+// Copyright 2019 DeepMind Technologies Limited
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using System;
+using System.Xml;
+using UnityEngine;
+
+namespace Mujoco {
+
+  // The component represents a joint with 6 degrees of freedom.
+  public class MjFreeJoint : MjBaseJoint {
+    protected override void OnParseMjcf(XmlElement mjcf) {}
+
+    protected override XmlElement OnGenerateMjcf(XmlDocument doc) {
+      return (XmlElement)doc.CreateElement("freejoint");
+    }
+  }
+}