Wall detection in unity

DetectWall.cs

    // The distance where collision will be detected
    public float collisionDistance = 3f; ///valeur debut Default

    // Return available directions depending on player direction
    private Vector3 AvailableDirection()
    {
        var direction = Vector3.zero;

        if (ToucheMur(DirectionalRay(transform.forward)))
        {
            if (ToucheMur(DirectionalRay(transform.right)))
            {
                direction = -transform.right;
            } else if (ToucheMur(DirectionalRay(-transform.right)))
            {
                direction = transform.right;
            }
        } else
        {
            direction = transform.forward;
        }


        return direction;
    }

    // Check if the player is touching the wall
    private bool ToucheMur(Ray ray)
    {
        int layer_Mur = LayerMask.GetMask("Mur");
        return Physics.Raycast(ray, collisionDistance, layer_Mur, QueryTriggerInteraction.UseGlobal);
    }

    // Create a ray from the player to the specified direction
    private Ray DirectionalRay(Vector3 direction)
    {
        return new Ray(transform.position, direction);
    }