Abstract: In an example embodiment, a reflective inclined surface is used as a calibration object. During a calibration process, the relative 3D position between a light source and a camera may be determined by activating the light source and capturing an image of how the light source bounces off the reflective calibration object. This may be repeated multiple times with the reflective inclined surface turned ninety degrees, along the z-axis, each time, essentially spinning the reflective inclined surface so that the highest edge is perpendicular to where it was previously with each capture of the camera. This allows the angle at which the light source strikes the reflective inclined surface in each repetition to be calculated, and these angles can then be used to determine the 3D position of the light source relative to the camera. The same technique with the same calibration object can be used to perform camera calibration.