Fixed steep surfaces bug

UOP1_Project/Assets/Scripts/Characters/Character.cs

     [Tooltip("Represents how fast gravityContributionMultiplier will go back to 1f. The higher, the faster")] public float gravityComebackMultiplier = 15f;
     [Tooltip("The maximum speed reached when falling (in units/frame)")] public float maxFallSpeed = 50f;
     [Tooltip("Each frame while jumping, gravity will be multiplied by this amount in an attempt to 'cancel it' (= jump higher)")] public float gravityDivider = .6f;
+    [Tooltip("Adjust the friction of the slope")] public float slideFriction = 0.3f;
+
 
     private float gravityContributionMultiplier = 0f; //The factor which determines how much gravity is affecting verticalMovement
     private bool isJumping = false; //If true, a jump is in effect and the player is holding the jump button
+    private Vector3 hitNormal; // ground normal
+    private bool shouldSlide; // Should player slide?
+    
+    
+        
+       
+        
+
         //Raises the multiplier to how much gravity will affect vertical movement when in mid-air
         //This is 0f at the beginning of a jump and will raise to maximum 1f
         if (!characterController.isGrounded)
         //Calculate the final verticalMovement
         if (!characterController.isGrounded)
         {
+
             //Less control in mid-air, conserving momentum from previous frame
             movementVector = inputVector * speed;
 
             }
         }
 
+        // if player has to slide then add sideways speed to make it go down
+        if (shouldSlide)
+        {
+            movementVector.x += (1f - hitNormal.y) * hitNormal.x * (speed - slideFriction);
+            movementVector.z += (1f - hitNormal.y) * hitNormal.z * (speed - slideFriction);
+        }
+        
+
+
+        // check if the controller is grounded and above slope limit
+        // if player is grounded and above slope limit
+        // player has to slide
+        shouldSlide = !(Vector3.Angle(Vector3.up, hitNormal) <= characterController.slopeLimit);
 
         //Rotate to the movement direction
         movementVector.y = 0f;
     
     private void OnControllerColliderHit(ControllerColliderHit hit)
     {
+        hitNormal = hit.normal;
         if (isJumping)
         {
             // Making sure the collision is near the top of the head
                 verticalMovement = 0f;
             }
         }
+
     }
 
     //---- COMMANDS ISSUED BY OTHER SCRIPTS ----
 
     public void Jump()
     {
-        if (characterController.isGrounded)
+        // Disable jumping if player has to slide
+        if (characterController.isGrounded && !shouldSlide)
         {
             isJumping = true;
             jumpBeginTime = Time.time;
     {
         isJumping = false; //This will stop the reduction to the gravity, which will then quickly pull down the character
     }
+
+   
 }