Merge branch 'soccer-2v1' into asymm-envs

Project/Assets/ML-Agents/Examples/Tennis/Materials/Physic_Materials/ballMat.physicMaterial

 --- !u!134 &13400000
 PhysicMaterial:
   m_ObjectHideFlags: 0
-  m_PrefabParentObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
-  bounciness: 1
+  bounciness: 0.8
   frictionCombine: 1
   bounceCombine: 3

Project/Assets/ML-Agents/Examples/Tennis/Prefabs/TennisArea.prefab

     vectorActionSize: 03000000
     vectorActionDescriptions: []
     vectorActionSpaceType: 1
-  m_Model: {fileID: 11400000, guid: d6c5e749e4ceb4cf79640a5955706d3d, type: 3}
+  m_Model: {fileID: 11400000, guid: af0e636edb8584db08624f42c5f71f97, type: 3}
   m_InferenceDevice: 0
   m_BehaviorType: 0
   m_BehaviorName: Tennis
   m_GameObject: {fileID: 1273406647218856}
   serializedVersion: 2
   m_Mass: 0.75
-  m_Drag: 0.2
+  m_Drag: 0
   m_AngularDrag: 0.05
   m_UseGravity: 1
   m_IsKinematic: 0
     vectorActionSize: 03000000
     vectorActionDescriptions: []
     vectorActionSpaceType: 1
-  m_Model: {fileID: 11400000, guid: d6c5e749e4ceb4cf79640a5955706d3d, type: 3}
+  m_Model: {fileID: 11400000, guid: af0e636edb8584db08624f42c5f71f97, type: 3}
   m_InferenceDevice: 0
   m_BehaviorType: 0
   m_BehaviorName: Tennis

Project/Assets/ML-Agents/Examples/Tennis/Scripts/TennisArea.cs

     public GameObject agentB;
     Rigidbody m_BallRb;
     HitWall m_BallScript;
+    Vector3 down = new Vector3(0f, -15f, 0f);
+
     // Use this for initialization
     void Start()
     {
 
     void FixedUpdate()
     {
+        m_BallRb.AddForce(down);
-        //m_BallRb.velocity = new Vector3(Mathf.Clamp(rgV.x, -9f, 9f), Mathf.Clamp(rgV.y, -9f, 9f), rgV.z);
+        m_BallRb.velocity = new Vector3(Mathf.Clamp(rgV.x, -20f, 20f), Mathf.Clamp(rgV.y, -30f, 30f), rgV.z);
     }
 }