Check with WorldViz engineers for suggestions on camera placement based on the dimensions of the physical space and your requirements.
Camera Placement Guidelines
The optimal height of the cameras depends on your application. Higher camera placement with steeper downward pitch can help reduce tracking error. This reduces the possibility of two markers falling within the same intersection ray of a given camera. The downside of increased pitch is a reduction in the camera range.
Determine the extreme limits of the tracking space and orient cameras (yaw and pitch) to see the light at those extremes.
For effective PPT tracking, a marker must be visible to at least 2 cameras. Try to arrange your cameras to maximize the overlap of their field-of-views.
The ideal angle between your cameras is 90 degrees (perpendicular). Two adjacent cameras directed at angles that are at similar angles (near parallel) will result in poor triangulation accuracy. However, sometimes 90 degree angles between cameras can reduce the tracked volume and you should adopt a compromise.
The PPT wand can be obscured by a person's body more easily than PPT Eyes or head tracker. Make sure there is sufficient camera coverage to account for these types of obscurations.
Example: Square workspace
Two camera arrangements are shown below. Orange indicates tracking by 2 cameras, yellow indicates 3 cameras, and green indicates 4 cameras.
Image 1: Cameras are adjusted to maximize the trackable footprint (camera views are flush against opposite walls).
Image 2: Cameras are adjusted to maximize the high-quality tracking region (yellow and green) at the cost of a few holes in the tracking coverage.
Tracking Quality vs Tracking Coverage
As shown in the images above, there can be a trade-off between optimizing tracking quality and maximizing the tracking space.