4.9.7.2 Visibility Cullers

With a sector there is always an associated visibility culler. Currently Crystal Space supports two cullers:

• `frustvis': This is the default visibility culler that is used if no other is specified. It only does frustum culling. It is the best culler to use for simple sectors that don't have a lot of objects or else for sectors that are big but where all objects are small. For such sectors it doesn't make much sense to try to do more complicated visibility culling so frustum cullling (testing if an object is visible in the current view) is more than enough.
• `dynavis': This is a more advanced visibility culler that does frustum culling in addition to trying to avoid rendering objects that are obscured by other objects. This culler is mainly useful when you have big complex sectors with lots of objects and when objects have a good chance of occluding (hiding) other objects.

This document will mainly discuss `Dynavis'.

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