1. A method comprising: generating, for display on one or more display devices in a virtual-reality environment, an image comprising a visual representation of a 3-D virtual scene rendered from the perspective of a subject located in the virtual-reality environment; modifying the image to further comprise a chroma-key background inserted into the visual representation of the 3-D virtual scene, wherein the chroma-key background is positioned in the image such that when the image is displayed on the one or more display devices, the subject is seen against the chroma-key background from the view of a camera recording the subject; displaying, on the one or more display devices, the image comprising the visual representation of the 3-D virtual scene with the chroma-key background inserted, such that the chroma-key background is visible on the one or more display devices; and recording, using the camera, an image of the subject in the virtual-reality environment against the chroma-key background along with at least a portion of the one or more display devices.