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Controller commands allow you to configure gamepad behavior, including aim assist, deadzones, and analog stick movement.

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Aim Assist

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chimera_aim_assist

Enable Halo’s fixed aim assist for analog sticks. The PC release broke aim assist, and Chimera fixes it.
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enabled
boolean
true to enable aim assist, false to disable
chimera_aim_assist true
Aim assist only works with analog stick input, not mouse and keyboard.

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Analog Input Configuration

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chimera_deadzones

Set deadzones for analog stick input to prevent drift and unwanted movement.
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value
number
Deadzone amount (0.0 to 1.0)
chimera_deadzones 0.15    # 15% deadzone (recommended starting point)
chimera_deadzones 0.25    # Larger deadzone for worn controllers
Start with a value around 0.15 and adjust based on your controller’s condition. Increase if you experience drift, decrease if the controller feels unresponsive.

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chimera_diagonals

Set diagonal sensitivity for analog stick movement. This compensates for Halo converting analog input to digital movement (the netcode doesn’t support analog movement).
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value
number
Diagonal sensitivity (0.0 to 1.0)
chimera_diagonals 0.75    # Recommended value
chimera_diagonals 0.85    # More sensitive diagonals
A value of 0.75 provides good diagonal movement while maintaining accuracy.

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Auto-centering

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chimera_block_auto_center

Disable automatic view centering in vehicles.
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enabled
boolean
true to disable auto-centering, false to enable it
chimera_block_auto_center true
Chimera fixes the frame-rate dependent auto-centering bug, so this command is primarily for user preference.

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Mouse Settings

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chimera_block_mouse_acceleration

Disable Halo’s built-in mouse acceleration. Halo uses raw input but adds its own acceleration on top.
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enabled
boolean
true to disable acceleration, false to enable it
chimera_block_mouse_acceleration true
This only affects Halo’s internal acceleration. Your operating system’s mouse settings (bypassed by raw input) are not affected unless running in Wine.

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chimera_mouse_sensitivity

Set mouse sensitivity with more granular control than Halo’s built-in settings.
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horizontal
number | 'off'
Horizontal sensitivity multiplier, or “off” to disable
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vertical
number
Vertical sensitivity multiplier (required if horizontal is set)
chimera_mouse_sensitivity 2 1       # Double horizontal, normal vertical
chimera_mouse_sensitivity 1.5 0.75  # Custom ratio
chimera_mouse_sensitivity off       # Use Halo's default settings
It’s recommended to disable mouse acceleration when using low sensitivity values.

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Sensitivity Reference Table

Equivalent values for Halo’s built-in sensitivity settings:
Halo SettingHorizontalVertical
104.02.0
94.02.0
83.01.5
72.01.0
61.50.75
51.250.625
41.00.5
30.750.375
20.50.25
10.250.125

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Controller Configuration Files

For advanced controller configuration, edit the controller settings in chimera.ini. Chimera supports extensive gamepad customization including:
  • Button remapping
  • Trigger deadzones
  • Stick curve adjustments
  • Multiple controller profiles
See the Controller Configuration section for detailed information.
Premade controller configurations are available in the Chimera repository.

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Auto Uncrouching

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chimera_auto_uncrouch

Control whether the game automatically uncrouches when running at full speed (original Halo PC behavior).
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enabled
boolean
true to re-enable auto-uncrouching, false to allow crouching while running
chimera_auto_uncrouch false  # Allow crouch-running (default)
chimera_auto_uncrouch true   # Original behavior

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