Introduction
These requirements describe how and where to place control points for scanning with NavVis devices.
Requirements for NavVis Devices
To achieve the best possible results in terms of overall accuracy, spread control points across the full planned scanning area.
Do not add control points in a single straight line, change the height on walls. At least one control point must be offset to the side, not all on a single center line.
Control point locations should be kept as consistent as possible between levels (similar relative position per floor).
Control points must use surveyed coordinates that match the survey file IDs written next to the markers.
Add control points at:
The ends of long runs (e.g. corridors, façades, production lines), and
Major transitions (e.g. zone changes, floor changes, geometry changes).
Near corners, columns, or other wall breaks / perimeter features.
On stable features (e.g. structural columns, permanent walls).
At stair landings
Near stair and elevator entrances on each level.
Place control points near:
Zone boundaries, and floor boundaries
Near both ends of the corridor or linear run.
At mid‑span in long corridors / façades (add more if needed for length/complexity).
Place control points at a working height that:
Is easy to see from typical scanner positions
Is easy to reach for capturing using a NavVis device.
Do not place control points in the following:
Swinging door areas
Tight turning areas.
High foot traffic areas where they can be covered (e.g. posters) or damaged.
Highly reflective surfaces
Patterned backgrounds that reduce visibility.
Control points must be:
High‑contrast
Matte (non‑reflective)