Unity에서 자체 중력을 사용하지 않고 점프하는 방법

        //    
        if (Input.GetButtonDown("Jump") &&nextJump)            //        
            if (currentBaseState.fullPathHash == walkingState|| 
                currentBaseState.fullPathHash == runningState||
                currentBaseState.fullPathHash == standingState)//          
            {
                nextJump = false;//         
                GameManager.isJumping = true;//      
                if (GameManager.isStanding)
                {
                    jumpV_x = 0;//             0
                    GameManager.isStanding = false;//            ，  
                }
                if (GameManager.isWalking)
                {
                    jumpV_x = Haxis * moveSpeed;
                    GameManager.isWalking = false;
                }
                if (GameManager.isRunning)                //    
                {
                    jumpV_x = Haxis * moveSpeed;
                    jumpVelocity = GameManager.jumpVelocity * GameManager.jumpMultiple;//             
                    GameManager.isRunning = false;
                }
            }

    private void LateUpdate()
    {
        transform.Translate(Vector3.right * Time.deltaTime * moveSpeed * Haxis); //      
        if (GameManager.isJumping)                   //    
        {

            jumpHight += jumpVelocity * Time.deltaTime * jumpSpeed;
            jumpVelocity = jumpVelocity - 9.8f * Time.deltaTime * jumpSpeed;
            currentPosition.y = jumpHight;
            currentPosition.x = privousPosition.x + Time.deltaTime * jumpV_x; //        
            transform.position = currentPosition;

        }

    void OnCollisionEnter(Collision collider)
    {
        //    
        if (collider.gameObject.tag == "Ground")
        {
            nextJump = true;
            GameManager.isGround = true;
            GameManager.isJumping = false;

            //      
            moveSpeed = GameManager.moveSpeed;           
            jumpVelocity = GameManager.jumpVelocity;
            jumpHight = 0;
            jumpV_x = 0;

            Debug.Log("ground!");
        }
    }
    void OnCollisionExit(Collision collider)
    {
        //    
        if (collider.gameObject.tag == "Ground")
            GameManager.isGround = false;
        Debug.Log("offground!");
    }