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Chimera provides extensive features and enhancements to Halo: Combat Evolved PC. These features are designed to fix bugs, improve performance, enhance visuals, and provide modern functionality that should have been in the PC release.

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Feature Philosophy

To preserve the base game experience as much as possible, most features are not turned on by default. The ones that are enabled by default only exist to enhance or fix the game without changing core gameplay.
Chimera is designed to make Halo PC what it should have been - a proper, polished PC port with modern features and bug fixes.

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Core Feature Categories

Interpolation

Smooth object movement beyond 30 FPS tick rate limitation

Bug Fixes

Fixes for camera shake, descope, checkpoints, and many more issues

Visual Enhancements

Shader fixes, improved rendering, and visual quality improvements

Custom Chat

Replacement for the broken Keystone chat system

Map Support

Custom Edition maps on retail, compressed maps, and more

Lua Scripting

Powerful Lua scripting API for advanced customization

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Passive Features

These features are always enabled and provide fundamental improvements:
  • Interpolation - Smooth movement at high frame rates
  • Limit Increases - BSP polygon limit (32767), visible objects (1024), draw distance (2250 wu)
  • Compressed Maps - Support for zstd-compressed map files
  • Fast Loading - CRC32 on map load instead of startup
  • Fast Server Listing - Improved master server query performance
  • 128 MiB Map Leak Fix - Prevents file descriptor leaks with large maps
  • Model LOD Fix - Prevents “4K headless chief” glitch
  • FOV Fix - Consistent FOV across different resolutions
  • Custom Chat - Stable replacement for crashy Keystone chat

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Configurable Features

Many features can be customized through:
The chimera.ini file provides extensive customization options including:
  • Video mode settings (resolution, refresh rate, vsync)
  • Custom chat appearance and behavior
  • Font overrides with system fonts
  • Memory settings for map loading
  • Controller configuration
  • Hotkey bindings
Chimera provides over 60 console commands starting with chimera_ prefix:
  • Field of view adjustment
  • Visual toggles and tweaks
  • Quality of life features
  • Multiplayer enhancements
  • Debugging tools

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Performance Impact

Most features have minimal to zero performance impact:
  • Limit increases only affect performance if maps exceed the original limits
  • Interpolation is highly optimized and runs on modern hardware with negligible overhead
  • Optional features can be disabled if needed
While Chimera isn’t too taxing on modern systems, it can make Halo harder to run on extremely ancient hardware.

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Compatibility

Chimera works with:
  • Halo PC (Retail) - Full support
  • Halo Custom Edition - Full support
  • Halo Trial - Full support
Chimera can enable Custom Edition map support on retail Halo PC by adding custom_bitmaps.map, custom_loc.map, and custom_sounds.map to your maps folder.

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Next Steps

Installation

Get started with installing Chimera

Configuration

Learn how to configure Chimera

Commands

Explore available console commands

Lua Scripting

Extend functionality with Lua scripts

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