1. A method comprising: accessing a first silhouette image of a person in a living unit, the first silhouette image based on a first video signal recorded by a first video camera; accessing a second silhouette image of the person in the living unit, the second silhouette image being of a different view of the person than the first silhouette image, the second silhouette image based on a second video signal recorded by a second video camera, the second video camera being a different video camera than the first video camera, the first video camera and the second video camera being positioned to record an area of the living unit from a different position in the living unit; and generating a three-dimensional model of the person in voxel space based on the first silhouette image, the second silhouette image, and viewing conditions of the first video camera and the second video camera.