LWJGL Physics Engine 2.0

A 3D game engine with OpenGL rendering, GLSL shaders, and Bullet Physics integration, built in Kotlin.

Note: This was an early project, created in January 2022 when I was 14. The code remains unchanged from the original - this README was added later for archival purposes.

Features

• OpenGL rendering via LWJGL
• GLSL shaders with Phong lighting model
• Bullet Physics integration for rigid body dynamics
• OBJ model loading
• Material system (ambient, diffuse, specular, reflectance)
• Lighting (directional + point lights with attenuation)
• Texture support
• First-person camera

Project Structure

game_engine/
├── graphics/
│   ├── Shader.kt          # Shader compilation & uniform management
│   ├── Mesh.kt            # VAO/VBO handling
│   ├── Model.kt           # Model with material & texture
│   ├── GameWindow.kt      # LWJGL window & render loop
│   ├── lighting/
│   │   ├── DirectionalLight.kt
│   │   ├── PointLight.kt
│   │   └── Material.kt
│   └── objects/
│       ├── GameObject.kt
│       └── OBJ.kt         # Wavefront OBJ loader
├── maths/
│   ├── Camera.kt
│   └── Transform.kt
└── input/
    └── Input.kt

physics_engine/
├── PhysicsWorld.kt        # Bullet dynamics world wrapper
└── RigidBody.kt

Shaders

The engine includes two shader sets:

• basic - Unlit rendering
• lit - Full Phong lighting with:
  • Ambient light
  • Directional light
  • Point lights with distance attenuation
  • Specular highlights

Dependencies

• LWJGL 3 (OpenGL, GLFW)
• JOML (math library)
• JBullet (Bullet Physics Java port)

Author

Oliver Seifert (@ImGajeed76) - January 2022