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The Background Render Element includes just the background as set in the scene, with the rest of the image rendered as black. 

 

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Overview

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The Background Render Element stores an image of the texture used in the background behind geometry in a scene as seen from the camera. Geometry that blocks the background image renders as black.

This render element interprets a background textures as the background; other types of manually created backgrounds, such as a plane object mapped with a texture set outside a window, will not interpreted to be the "background" for the purposes of this render element.

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The Background Render Element is primarily used for layering the the Beauty element (or combined render elements) on top of the background image. The render's Alpha channel can be used to create a matte for such a composite. In the following example the atmosphere and depth of field have been turned off for the sake of clarity.

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