如何清除LineRenderer路径来重画线条？

using UnityEngine;

public class LineRendererController : MonoBehaviour
{
    private LineRenderer lineRenderer;

    private void Start()
    {
        // 获取LineRenderer组件的引用
        lineRenderer = GetComponent<LineRenderer>();
    }

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space))
        {
            // 清除路径
            lineRenderer.positionCount = 0;
        }

        if (Input.GetMouseButton(0))
        {
            // 添加新的路径点
            Vector3 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            mousePosition.z = 0f;
            lineRenderer.positionCount++;
            lineRenderer.SetPosition(lineRenderer.positionCount - 1, mousePosition);
        }
    }
}