CS 6610 Interactive Comp Graph

---

Final Project PBR

Name: Yongfeng Qiu & Zhongyi Jiang

Operating environment

• Windows10
• MacOS Monterey(12.0.1)

Library

• GLFW (GLFW provides a simple API for creating windows, contexts, and surfaces, receiving input and events.)
• GLAD (GLAD is a Multi-Language GL/GLES/EGL/GLX/WGL Loader-Generator based on the official specs.)
• ImGui (ImGui is a bloat-free graphical user interface library for C++.)
• GLM (OpenGL Mathematics (GLM) is a header-only C++ mathematics library for graphics software based on the OpenGL Shading Language (GLSL) specifications.
• stb_image (Decoding different type images like JPG, PNG)
• ASSIMP (A library to import and export various 3d-model-formats including scene-post-processing to generate missing render data.)

Compiling environment

• CMake
• In the Win10, I use CMake + VS2019.
• In the MacOS, I use CMake + Makefile + NeoVim

---

What I implemented

• Specular BRDF
  • Cook-Torrance
    • $F_r(v,l) = \frac{D(h,a)G(v,l,a)F(v,h,F_0)}{4(n \cdot v)(n \cdot l)}$
    • Normal distribution function
      • $D_{GGX}(h,a) = \frac{a^2}{\pi ((n \cdot h)^2(a^2-1)+1)^2}$
    • Smith geometric shadowing function
      • $G(v,l,a)=\frac{2(n \cdot l)}{n \cdot l + \sqrt{a^2 + (1-a^2)(n \cdot l)^2}} \frac{2(n \cdot v)}{n \cdot v + \sqrt{a^2 + (1-a^2)(n \cdot v)^2}}$
    • Fresnel
      • $F_{Schlick}(v,h,F_0, F_{90})=F_0+(F_{90}-F_0)(1-v \cdot h)^5$
  • Cloth specular BRDF (Ashikhminoo)
    • $D_{velvet}(v,h,a)=c_{norm}(1+4exp(\frac{-cot^2 \theta_h}{a^2}))$
    • $F_r(v,h,a) = \frac{1}{\pi (1+4a^2)}(1+4 \frac{exp(\frac{-cot^2 \theta_h}{a^2})}{sin^4 \theta_h})$
• Diffuse BRDF
  • Lambertian function
    • $F_d(v,l) = \frac{\sigma}{\pi}$
  • Disney diffuse BRDF (Burley)
    • $ F_d(v,l) = \frac{\sigma}{\pi}F_{Schlick}(n,l,1,F_{90})F_{Schlick}(n, v, 1,F_{90})$
• Physicall based camera
  • Position, Target, WorldUp, Pitch, Yaw
  • Aperture
  • Shutter speed
  • Sensitivity
• Texture
  • Procedural Texture
    • noise
  • Image Texture
    • AlbedoMap, NormalMap, RoughnessMap, DisplacementMap, AoMap, MetallicMap
  • Solid Texture
• Light
  • Theory light
    • Point Light, Spot Light, Directional Light
  • Area Light
  • Image Base Light
• UI
  • camera
  • light
• **Disney principle **

What I will implement

• Light
  • IBL
  • Area Light
• More detailed Disney rules
• Optimize, modify procedural Texture
• Optimize, modify cloth specular BRDF

How to use my implementation

• In Windows

1. Use CMake to compile the program
2. Set finalproj as startup item
3. Run the program

• In MacOS

cd /Project directory/CS6610_Final
rm build && mkdir build
cd build
cmake ..
make 
./Projectfinal
make clean

---

Result

Here are my result. I also submitted a video showing how I compiled and ran on Windows. It also has the running results of my program.

Material

• Image Texture(AlbedoMap, NormalMap, RoughnessMap, DisplacementMap, AoMap, MetallicMap)

• Solid Texture(Albedo, SheenColor, Metallic, Roughness, Ao)

• Procedural Texture

Physicall based camera

Light

• Theory Light

• Image base light

• Area light

Disney principle

References
[1] Burley B, Studios W D A. Physically-based shading at disney[C]//ACM SIGGRAPH. 2012
[2] Pharr M, Jakob W, Humphreys G. Physically based rendering: From theory to implementa- tion[M]. Morgan Kaufmann, 2016.