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# Interface: mental_ray_Preferences

Interfaces > Core Interfaces > mental_ray_Preferences

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The mental_ray_Preferences Core Interface lets you enable and disable the mental ray Extensions.

Properties:

    mental_ray_Preferences.mrExtensionsActive : bool : Read|Write

Enable / disable the mental ray Extensions.

The Extensions include the additional "mental ray Connection" rollout in the Material Editor and the "mental ray Light Shader" rollout in the UI of 3ds Max Lights.

#### See Also

- MAXScript Extensions for mental ray

- Mental_Ray_Renderer : RendererClass