Lecture 08: Lighting and shadows
Computer graphics in Game development
Ivan Belyavtsev
6.11.2020
Rendering equation
\[L_o(X, \vec{\omega_o}) = L_e(X, \vec{\omega_o}) + \int_S L_i(X, \vec{\omega_o}) f_{X,\vec{n}}(\vec{\omega_i}, \vec{\omega_o}) |\vec{\omega_i} \cdot \vec{n} | d{\omega_i} \] [1]
Phong law
\[L(\vec{P}) = Ka + \sum_{lights}{[Kd\vec{N} \cdot \vec{L} + Ks(\vec{V} \cdot \vec{R})^{Ns}]}\]
\[\vec{R} = 2(\vec{N} \cdot \vec{L})\vec{N}−\vec{L}\]
[2]
“Lighting” experiment
TODO
- Load a scene from an OBJ file
- Intersect all triangles
- Add anisotropic light
- Apply a simplified Phong model
“Lighting” experiment
Reference
“Lighting” experiment
What is the new knowledge?
- Tinyobjlib usage
- How to bring BRDF to our code
Shadow rays
“Shadow rays” experiment
TODO
- Implement shadow ray casting
- Apply shadows to the final image
- Fix a shadow acne
“Shadow rays” experiment
Reference
“Shadow rays” experiment
What is the new knowledge?
- How to implement hard shadows
- How to fix shadow acne
References
1.
McGuire M. The graphics codex. 2.14 ed. Casual Effects, 2018.
2.
Phong B.T. Illumination for computer generated pictures // Commun. ACM. New York, NY, USA: Association for Computing Machinery, 1975. Vol. 18, № 6. P. 311–317.