No depth information computed at the boundaries of large depth discontinuities

This article explains why you may be seeing dropouts or artifacting (i.e. no depth or 3D data) at large depth discontinuities.

If you are seeing dropouts or artifacting (i.e. no depth or 3D data) at large depth discontinuities, this may be a result of occlusions i.e. object 2 is between you and object 1, preventing you from seeing object 1. Occlusions are likely to happen at large depth discontinuities i.e. if there is something really close, it is likely to block something that is far away.

In this case, something that is visible in one of the Bumblebee2's (or XB3) cameras may be occluded in another camera. In order to determine the distance to an object, you need to be able to see it in at least 2 cameras.

Our only suggestion to avoid this happening is to ensure you can see the object in 2 of the 3 cameras (actually you need to see it in at least one of the left/right or top/right pairs).