Version: 2019.2
Texture Streaming
Texture Streaming API

Streaming Controller

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The Streaming Controller component is part of the Texture Streaming system. Add a Streaming Controller to GameObjectsThe fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more. A GameObject’s functionality is defined by the Components attached to it. More info
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if you want to use Texture Streaming to load their mip maps into Unity at run time.

For more details on how to use the Streaming Controller component, see the documentation page Texture Streaming API: Control Cameras for Texture Streaming

The Streaming Controller component
The Streaming Controller component
PropertyA generic term for the editable fields, buttons, checkboxes, or menus that comprise a component. An editable property is also referred to as a field. More info
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Description
Mip Map Bias Use this setting to force Unity to load smaller or larger mipmap levels than the one that the Texture Streaming system has chosen for those Textures. Use the numerical field to set the offset that Unity applies to the mipmap level. Unity adds this offset to all Textures visible from this Camera.

To control this via API, use StreamingController.streamingMipmapBias.
Texture Streaming
Texture Streaming API