Phong shading

ADS phong shading (opengl 3 backend)

Rather, it uses a more stylized, cartoon-like approach "heavily influenced by early 20th century commercial illustrations" and achieved with extensive use and manipulation of phong shading.

These contributions include: Gouraud shading, the Phong reflection model, the Phong shading method, and the rendering equation.

Phong shading is more computationally expensive than Gouraud shading since the reflection model must be computed at each pixel instead of at each vertex.

Before the advent of mass-marketed 3D acceleration hardware, democoders often focused on lighting and shading techniques in software 3D engines, including Gouraud shading, Phong shading, texture mapping, bump mapping, environment mapping, radiosity and even real-time ray tracing.