In environments where holographic models will be frequently displayed in the same location (e.g. production lines or workshop benches), registration codes should be placed approximately 4000mm apart to cover the work area for optimal precision. When deciding where to place codes, consider the positions of codes if they were projected in 2D to the ground plane, as Twinbuild uses only this 2D projection to calculate which codes are near the headset and how to interpolate between code positions. Avoid placing codes directly above one another. These codes can be placed in an ad-hoc fashion and later digitized using LIDAR scans or professional surveying equipment. After defining the position of these codes in the Twinbuild web application (or using the TwinbuildQR command in Rhino) they can be shared between published models to simplify the registration process.