輪郭 (Outline / Highlight)
参考：
Object Highlight | Unity Asset Store [Official]
NPR Contour Drawing | Unity Asset Store [Official]
Selected Effect – Outline | Unity Asset Store [Official]
Easy Performant Outline 2D / 3D | Unity Asset Store [Official]
Highlight Plus | Unity Asset Store [Official]
Easy Performant Outline 2D / 3D
参考：
Easy Performant Outline 2D / 3D | Unity Asset Store [Official]
Easy Performant Outline 2.0 – YouTube
URP Setup and Outliner Component – YouTube
2D Outline Z-only Mode – YouTube
Configuring through C# – YouTube
Highlight Plus
参考：
Highlight Plus | Unity Asset Store [Official]
Ordered See-Through Effect with Highlight Plus | Kronnect (Medium)