投影是否正交（true）或透视（false）？
当正交为 true 时，投影由 orthographicSize 定义。
当正交为 false 时，投影由 fieldOfView 定义。其他资源：投影组件。
using UnityEngine;
public class Example : MonoBehaviour { void Start() { Projector proj = GetComponent<Projector>(); proj.orthographic = true; } }
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