3D场景UNITY导出相机，怎么获取并使用

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child":[

		{
			"type":"Camera",
			"props":{
				"isStatic":false,
				"name":"AutoCamera",
				"clearFlag":1,
				"orthographic":false,
				"fieldOfView":60,
				"nearPlane":0.3,

"farPlane":90

			},


var camera= scene.getChildByName("AutoCamera");
        console.log(camera);

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camera打印显示NULL

183*****755

必须在场景加载完成的回调事件中获取子节点。