shading.md

Shading

Functions

• BSDF (bidirectional scattering distribution function)
• BRDF (bidirectional reflectance distribution function)
• BTDF (bidirectional transmittance distribution function)

models

• Lambertian reflectance
  • the ideal diffuse reflection model
  • https://en.wikipedia.org/wiki/Lambertian_reflectance
• Oren-Nayar reflectance model
  • https://en.wikipedia.org/wiki/Oren%E2%80%93Nayar_reflectance_model
  • takes account of rough surfaces
• Blinn-Phong reflectance model
  • https://en.wikipedia.org/wiki/Blinn%E2%80%93Phong_reflection_model
  • takes account of both diffuse and specular reflection
  • used in OpenGL and Direct3D's fixed-function pipeline (before Direct3D 10 and OpenGL 3.1)

References

• https://www.pbr-book.org/ ⭐
• https://therealmjp.github.io/posts/sg-series-part-1-a-brief-and-incomplete-history-of-baked-lighting-representations/