update model

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

+//Standardized movement controller for the Agent Cube
+using UnityEngine;
+
+public class TennisRacketMovement : MonoBehaviour
+{
+    [Header("RUNNING")] public ForceMode runningForceMode = ForceMode.Impulse;
+    //speed agent can run if grounded
+    public float agentRunSpeed = 20; 
+    //speed agent can run if not grounded
+    public float agentRunInAirSpeed = 10f; 
+    
+    [Header("IDLE")]
+    //coefficient used to dampen velocity when idle
+    //the purpose of this is to fine tune agent drag
+    //...and prevent the agent sliding around while grounded
+    //0 means it will instantly stop when grounded
+    //1 means no drag will be applied
+    public float agentIdleDragVelCoeff = .85f; 
+    
+    [Header("BODY ROTATION")]
+    //body rotation speed
+    public float agentRotationSpeed = 7f;
+
+    [Header("JUMPING")]
+    //upward jump velocity magnitude 
+    public float agentJumpVelocity = 15f;
+
+    [Header("FALLING FORCE")]
+    //force applied to agent while falling
+    public float agentFallingSpeed = 50f;
+
+    public void Jump(Rigidbody rb)
+    {
+        Vector3 velToUse = rb.velocity;
+        velToUse.y = agentJumpVelocity;
+        rb.velocity = velToUse;
+    }
+    
+    public void RotateBody(Rigidbody rb, Vector3 rotationAxis)
+    {
+        rb.MoveRotation(rb.rotation * Quaternion.AngleAxis(agentRotationSpeed, rotationAxis));
+    }
+
+    public void RunOnGround(Rigidbody rb, Vector3 dir)
+    {
+        var vel = rb.velocity.magnitude;
+        float adjustedSpeed = Mathf.Clamp(agentRunSpeed - vel, 0, agentRunSpeed);
+        rb.AddForce(dir.normalized * adjustedSpeed,
+            runningForceMode); 
+    }
+    
+    public void RunInAir(Rigidbody rb, Vector3 dir)
+    {
+        var vel = rb.velocity.magnitude;
+        float adjustedSpeed = Mathf.Clamp(agentRunInAirSpeed - vel, 0, agentRunInAirSpeed);
+        rb.AddForce(dir.normalized * adjustedSpeed,
+            runningForceMode); 
+    }
+
+    public void AddIdleDrag(Rigidbody rb)
+    {
+        rb.velocity *= agentIdleDragVelCoeff;
+    }
+    
+    public void AddFallingForce(Rigidbody rb)
+    {
+        rb.AddForce(
+            Vector3.down * agentFallingSpeed, ForceMode.Acceleration);
+    }
+}
+    

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