这不是一个主观的解决办法，因为当粒子块朝向摄像机时，他们与光源的角度会改变，他们的亮度也会随之而变。
This isn't a liable solution, because when the billboards turn to follow the camera, their Angle relative to the light source will change, and so will their brightness.
与物体表面亮度的主观感觉相对应的客观物理性质。
The objective physical property corresponding to the subjective sensation of the brightness of a surface.
与物体表面亮度的主观感觉相对应的客观物理性质。
The objective physical property corresponding to the subjective sensation of the brightness of a surface.
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