相机数据节点
The Camera Data node returns information about the shading point relative to the camera. This could be used for example to change the shading of objects further away from the camera, or make custom fog effects.
该节点没有输入项。
视图矢量
A normalized vector, in camera space, from the camera to the shading point.
从每个像素点到相机的距离。
视图距离