Replaced character controller with rigidbody and fixed all player controller script errors - player character can only spin in place

Assets/Scenes/Test Scene.unity

@@ -484,8 +484,7 @@ MeshRenderer:
   m_RayTracingMode: 2
   m_RenderingLayerMask: 1
   m_RendererPriority: 0
-  m_Materials:
-  - {fileID: 2100000, guid: 727f61c75f8320d4ab79aaf01ab76181, type: 2}
+  m_Materials: []
   m_StaticBatchInfo:
     firstSubMesh: 0
     subMeshCount: 0
@@ -542,29 +541,27 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   speed: 20
-  jumpHeight: 15
+  jumpSpeed: 20
   gravity: 5
   rotationSpeed: 20
   pivot: {fileID: 1402695046}
   playerModel: {fileID: 615882415}
---- !u!143 &741217458
-CharacterController:
+--- !u!54 &741217458
+Rigidbody:
   m_ObjectHideFlags: 0
   m_CorrespondingSourceObject: {fileID: 0}
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 741217452}
-  m_Material: {fileID: 0}
-  m_IsTrigger: 0
-  m_Enabled: 1
   serializedVersion: 2
-  m_Height: 2
-  m_Radius: 0.5
-  m_SlopeLimit: 45
-  m_StepOffset: 0.3
-  m_SkinWidth: 0.08
-  m_MinMoveDistance: 0.001
-  m_Center: {x: 0, y: 0, z: 0}
+  m_Mass: 1
+  m_Drag: 5
+  m_AngularDrag: 0.05
+  m_UseGravity: 1
+  m_IsKinematic: 0
+  m_Interpolate: 0
+  m_Constraints: 80
+  m_CollisionDetection: 0
 --- !u!1 &876326172
 GameObject:
   m_ObjectHideFlags: 0

Assets/Scripts/PlayerController.cs

@@ -9,31 +9,36 @@ using System.Collections;
 
 public class PlayerController : MonoBehaviour
 {
-    CharacterController characterController;
+    Rigidbody rb;
 
     public float speed;
-    public float jumpHeight;
+    public float jumpSpeed;
     public float gravity;
     public float rotationSpeed;
     public Transform pivot;
     public GameObject playerModel;
 
-    private int jump = 0;
+    private bool extraJump = true;
+    private float distToGround;
     private Vector3 moveDirection;
 
     void Start()
     {
-        characterController = GetComponent<CharacterController>();
+        rb = GetComponent<Rigidbody>();
     }
 
-    void Update()
+    bool IsGrounded(){
+        return Physics.Raycast(transform.position, -Vector3.up, distToGround + 0.1f);
+    }
+
+    void FixedUpdate()
     {
 
         float yStore = moveDirection.y;
         //Need to switch to 'raw' when using keyboard
         moveDirection = (transform.forward * Input.GetAxis("Vertical")) + (transform.right * Input.GetAxis("Horizontal"));
 
-        if (jump <= 1)
+        if (extraJump == true)
         {
             moveDirection = moveDirection.normalized * speed; //Remove this line to make running diagonal the fastest standard run
         } else
@@ -43,9 +48,9 @@ public class PlayerController : MonoBehaviour
 
         moveDirection.y = yStore;
 
-        if (characterController.isGrounded)
+        if (IsGrounded())
         {
-            jump = 0;
+            extraJump = true;
             moveDirection.y = 0.0f;
 
             if(Input.GetKey(KeyCode.LeftShift))
@@ -55,18 +60,24 @@ public class PlayerController : MonoBehaviour
                 moveDirection = moveDirection.normalized * speed;
             }
 
+            if (Input.GetButtonDown("Jump"))
+            {
+                moveDirection.y = jumpSpeed;
+            }
+
+        } else {
+            if (Input.GetButtonDown("Jump") && extraJump == true)
+            {
+                moveDirection.y = jumpSpeed;
+                extraJump = false;
+            }
+
         }
 
-        if (Input.GetButtonDown("Jump") && jump <= 1)
-        {
-            moveDirection.y = jumpHeight;
-            jump++;
-        }
-
-        moveDirection.y += Physics.gravity.y * gravity * Time.deltaTime;
+        moveDirection.y = moveDirection.y + (Physics.gravity.y * gravity * Time.deltaTime);
 
         // Move the controller
-        characterController.Move(moveDirection * Time.deltaTime);
+        rb.AddForce(moveDirection * Time.deltaTime);
 
         //Move the player in different directions based on camera look direction
         //Need to switch to 'raw' when using keyboard