id Tech 3

This is a modernized id Tech 3 engine.

This repository does not contain any game content from Quake III Arena

Features

Rendering:

• OpenGL renderer
• Vulkan renderer
• Physically Based Rendering (PBR)
• Spherical Harmonics lighting support
• Screen Space Ambient Occlusion (SSAO)
• High-quality SDF HUD text rendering with UTF-8 glyph support
• Optional SVG asset rasterization backend (librsvg/cairo)
• Froxel-based Volumetric Lighting with 2D Navier–Stokes fluid solver
• MSAA and SMAA anti-aliasing

Audio:

• OpenAL backend with HRTF for 3D positional audio
• Real-time reverb and occlusion effects via OpenAL EFX (heuristic environmental acoustics)
• Audio codec support: mp3, ogg, wav, flac, webm, opus

Video:

• Video codec support: RoQ, WebM (VP8/VP9), Ogg Theora, MP4 (H.264)

Models:

• Model formats supported: MD3, MDR, IQM, OBJ, FBX, GLTF, USD (Universal Scene Description), Maya Ascii, Collada (DAE), STL
• Blend Shapes (IQM, GLTF)

Scripting:

• Support for Lua scripting
• Support for JavaScript scripting

Images:

• Image format support: PNG, JPEG, TGA, BMP, DDS, WebP, HDR, OpenEXR (EXR), KTX, PKM, PVR

Image Generation:

• FLUX.2/FLUX.1 C image generation (optional, text-to-image from console with real-time hot-reloading and device selection; supports flux1-schnell, flux1-dev, flux2-dev; requires model files in game directory; Metal, BLAS, or pure C backend, with graceful fallback)

Networking:

• Full IPv6 and IPv4 dual-stack support (host, client, server)
• NAT traversal (UDP hole punching with automatic fallback strategies)
• Server discovery: LAN broadcast and master-server queries
• Built-in rate limiting/DDoS mitigation (connection flood protection)
• Challenge/response protocol with replay/spoof resistance enhancements
• Reliable UDP virtual channel (sequenced/reliable message streams)
• Asynchronous non-blocking networking (epoll/kqueue/libsockets abstractions)
• Graceful automatic fallback to IPv4-only if stack or OS configuration requires
• DTLS (Datagram TLS) support for secure UDP channels
• Optional TLS-secured remote console (off by default)
• Console/logging for connection diagnostics and real-time network statistics

Systems:

• AIML chatbot scripting
• GOAP (AI planning)
• Flocking and boids (crowd AI)
• Finite State Machines (FSM) and Behavior Trees
• Navigation Mesh (NavMesh) pathfinding (A*, Dijkstra)
• Event scripting (Lua, JavaScript)
• Physics and collision (with optional Bullet Physics)
• Multithreaded scheduler/task system
• Entity-Component System (ECS, ENTT)
• Replay and deterministic timing
• Save/restore system
• Dynamic dialogue and quests
• Procedural/random systems
• Statistics/telemetry tracking
• Debugging tools and overlays

Platforms

• Windows
• Linux
• Android
• MacOS

Standards

• The engine aims to be C23-compatible, and modernization is ongoing where it improves safety and portability.
• Native C bool is preferred in new or modernized code, but qboolean remains in use where needed for backward compatibility.

Links

• https://idtech3.com
• https://github.com/jksunny/quake3e