3. The size of the Zone of View and the occlusion factor.¶
The Optimal Zone of View size depends on the scene.
A bigger Zone of View conveys more information, if pushed too hard it might overwhelm the system at playback time. The relationship between the size of the Zone of View and the quantity of information is linked to the occlusion factor. This is the amount of surfaces that appear or disappear when the viewer is moving. When the viewer changes his point of view at playback, he might see a background that was previously occluded.
A scene in the sky ,with mountains far away, will have a very low occlusion factor. You might in that case be able to create a very big zone of view, of several meters long, without any issues.
A scene with a lot of nearby vegetation will have a very high occlusion factor, and might force a small zone of view. Maybe even smaller than the default one.
Now for a scene like this, with a very high occlusion factor, you can still get a large space for the viewer to move around. For this you can use multi-boxing, basically creating multiple zones of view located one next to the other .