Concepts Practiced So Far

Cross-platform project configuration using CMake (Windows, macOS, Linux/Ubuntu)
Lua scripting
- Game settings
Rasterizing lines using Bresenham's line algorithm
Linear interpolation (lerping)
OBJ file loading
- Basic vertices and faces
3D mesh data structures
- Vertex/Face
Rendering a mesh in wireframe mode
Rasterizing triangles using old-school "line sweep"
Math library
- Vectors
  - Component-wise addition, subtraction, multiplication, division
  - Dot product
  - Magnitude
  - Normalizing
Flat shading
Gouraud shading
Gamma correction
Hidden faces removal via Z-Buffer
Texture mapping
Barycentric coordinates
- Triangle rasterizing
- Z-buffer interpolation
Templated math library for applicable elements
- Vectors
- Matrics
Matrices
- Addition, subtraction, multiplication
- Determinant
- Identity
- Inverse
  - Orthogonal matrix inverse
Projections
- Perspective
Camera
- Perspective projection
Transformations
- Translation
- Rotation

To Learn

This serves as a high-level TODO list, in no particular order.

Primitive 3D objects
- Cube
- Sphere
- Plane
Axis-aligned bounding box (AABB)
Camera
- View frustum culling
Triangle clipping
Projections
- Orthographic
- Axonometric
  - Isometric
  - Dimetric
  - Trimetric
Matrices
- Inverse
Quaternions
Transformations
- Translation
- Scaling
- Rotation
- Reflection
- Shearing
Scene graph of objects
Barycentric coordinates
Shaders
- Vertex shaders
- Fragment/Pixel shaders
Rays
Anti-aliasing
Perspective correct interpolation
Phong shading
Normal mapping
- Object space
- Tangent space
Shadows
- Hard
- Soft
Ambient Occlusion
Skybox
GUI
- Slider
- Dropdown menu
Animation
Lua scripting
- Scene definition

Crown jewel, if I get far enough:

Water rendering
- Flat
- Waves
Physically-Based Rendering (PBR)