MonoBehaviour
{
    public Transform player;
    private Renderer wallRenderer;
    private Color originalColor;

    void Start()
    {
        wallRenderer = GetComponent<Renderer>();
        originalColor = wallRenderer.material.color;
    }

    void Update()
    {
        Vector3 direction = player.position - transform.position;
        RaycastHit hit;

        if (Physics.Raycast(transform.position, direction, out hit))
        {
            if (hit.transform == player)
            {
                Color transparentColor = originalColor;
                transparentColor.a = 0.3f; // Make it see-through
                wallRenderer.material.color = transparentColor;
            }
            else
            {
                wallRenderer.material.color = originalColor;
            }
        }
    }
}