[Unity] Anime-Style Perspective Correction

The problem this solves

3D anime characters look "off-model" the moment a camera gets close or wide-angle lensing kicks in noses stretch, cheeks bulge, the carefully art-directed face your character was designed around stops reading correctly. 

Vertices near the face compress along the camera's view axis in the vertex shader, pulling the silhouette back toward a flat, "on-model" 2D read. While the rest of the character stays fully 3D. The effect scales dynamically with camera distance and FOV, so close-ups and wide lenses get more correction automatically.

Model: https://sketchfab.com/3d-models/mahiro-oyama-onii-chan-wa-oshimai-f97ecef2a58b48... .from : ScarletJadeDream