This is a modernized id Tech 3 engine fork with PBR and ray tracing using C23 and C++23 standards.

Go to Releases section to download the latest binaries for your platform or follow Build Instructions.

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

Key features:

• C23 and C++23 standards
• Ray tracing
• Physically based rendering (PBR)
• Realtime global illumination
• Raymarching for volumetrics
• Material clearcoat, anisotropy, and subsurface scattering options
• Steamworks and Steam Deck compatible
• Modernized graphics options menu
• ImGui layer for in-engine tools and overlays
• SysCall registry
• QT Radiant world editor
• Job System and multi-threading
• Online and offline documentation
• Font Rendering with OTF, TTF, and Glyph support

Vulkan renderer

• Ray tracing (hardware-accelerated where available, DXR-compatible)
• High-quality per-pixel dynamic lighting
• Surfel-based indirect lighting and global illumination
• Physically correct area and spot lights
• Raymarching for volumetrics
• FSR and dynamic resolution
• Greatly reduced API overhead (call/dispatch ratio)
• Flexible vertex buffer memory management to allow loading huge maps
• Pipeline cache and incremental pipeline compilation for faster loading and less stutter
• Multiple command buffers to reduce processing bottlenecks
• Reversed depth buffer eliminates z-fighting on big maps
• Merged lightmaps (atlases)
• Multitexturing optimizations
• Static world surfaces cached in VBO (\r_vbo 1)
• Useful debug markers for RenderDoc
• Fixed framebuffer corruption on some Intel iGPUs
• Robust device lost & swapchain recreation handling
• Offscreen rendering, enabled with \r_fbo 1 (required for features below):
  • screenMap texture rendering for realistic environment reflections
  • Multisample anti-aliasing (\r_ext_multisample)
  • Supersample anti-aliasing (\r_ext_supersample)
  • Per-window gamma-correction (important for OBS/screen-capture tools)
  • High dynamic range render targets (\r_hdr 1), prevents color banding
  • Bloom post-processing effect
  • Arbitrary resolution rendering
  • Greyscale mode
• Triple-buffered V-Sync for low-latency and smooth frame pacing
• VRR (Adaptive Sync/G-SYNC/Freesync) support where available
• You can minimize the game window any time during \video or \video-pipe recording

OpenGL renderer

• OpenGL 1.1 compatible (uses features from newer versions when available)
• High-quality per-pixel dynamic lighting (\r_dlightMode)
• Merged lightmaps (atlases)
• Static world surfaces cached in VBO (\r_vbo 1)
• All offscreen rendering features available as in Vulkan renderer
• Bloom reflection post-processing effect

DirectX 12 renderer

• Modern Graphics API: Full DirectX 12 support (feature level 12.0+)
• Triple buffering for smooth frame presentation
• Command lists and descriptor heaps for optimized resource and command management
• Root signatures and pre-compiled pipeline state objects
• Resource barriers and fence-based GPU sync
• Multiple render target (MRT) and 32-bit depth buffer support
• DXGI swap chain with flip discard model
• Optional D3D12 debug layer (in debug builds)
• Automatic detection of supported Feature Levels (12.2, 12.1, 12.0, 11.1, 11.0 fallback)
• Support for Resource Binding Tiers 1, 2, and 3
• Ray Tracing (DXR):
  • GPU-accelerated ray tracing (where supported)
  • Realistic ray-traced lighting and effects
  • Hardware-dependent

Metal renderer

• Modern Metal API support (macOS/iOS)
• Triple buffering for efficient presentation
• Command buffers and encoders for rendering
• Render pipeline state objects for shaders
• Depth stencil state management
• Metal 2.0+ features: argument buffers, indirect command buffers
• Metal 3.0+ ray tracing support (macOS/iOS, where available)
• Automatic feature detection and capability queries
• iOS and macOS support with a unified codebase
• Metal Shading Language (MSL) shader compilation
• Efficient Metal resource allocation

Requirements:

• macOS 10.13+ or iOS 11.0+
• Metal-compatible GPU
• Xcode with Metal development tools

Platform Support:

• Full iOS app lifecycle management (UIApplicationDelegate)
• macOS window management (NSWindow)
• Unified platform abstraction layer for both iOS and macOS
• Automatic Metal feature detection/capability queries
• Retina display support
• Variable refresh rate (ProMotion) support
• High-DPI menu and input support on all platforms

Build Instructions

Links

• https://idtech3.com
• https://github.com/timfox/idTech3Radiant
• https://bitbucket.org/CPMADevs/cnq3
• https://github.com/ioquake/ioq3
• https://github.com/kennyalive/Quake-III-Arena-Kenny-Edition
• https://github.com/OpenArena/engine
• https://github.com/tomkidd/Quake3-iOS
• https://github.com/NVIDIA/Q2RTX
• https://github.com/TTimo/GtkRadiant
• https://github.com/JKSunny/Quake3e