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Occluder is a box-shaped object that is used to cull objects' surfaces, bounds of which are not visible behind it. The surfaces behind the Occluder are not sent to the GPU, thereby saving performance.
Depending on the Back Face parameter value, the front or back faces of Occluder are used to cull surfaces. The front faces of Occluder are the sides of the Occluder that face the camera. The back faces of Occluder are the sides that are behind the front faces.
Schematically, the Occluder faces can be shown as follows:
Front faces of Occluder
Back faces of Occluder
To create Occluder via UnigineEditor:
On the Node tab of the Parameters window, you can adjust the following parameters of Occluder: