Unity射线检测（持续更新）

2d射线检测

RaycastHit2D hit2D = Physics2D.Raycast(GetComponent<Rigidbody2D>().position + Vector2.up * 0.2f, lookDir, 1.5f, LayerMask.GetMask("xxx"));
if (hit2D.collider)
{
Debug.DrawLine(hit2D.point, hit2D.point + lookDir, Color.red);
}