SSAO2D
参考：
SSAO2D | Unity Asset Store [Official]
L2D
参考：
L2D – 2D Lights, Shadows, and Hidden Objects | Unity Asset Store [Official]
Lumbra
参考：
Lumbra – 2D Dynamic Lights and Field of View | Unity Asset Store [Official]
Luma Based Ambient Occlusion
参考：
Luma Based Ambient Occlusion (SSAO 2D) | Unity Asset Store [Official]
Smart Lighting 2D
参考：
Smart Lighting 2D | Unity Asset Store [Official]
Smart Lighting 2D Showcase v1.2.0 – YouTube
SF Soft Shadow 2D
参考：