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An 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.

By default, shadows from the occluded objects remain visible. To disable shadows rendering, go to Windows -> Settings -> Occlusion Culling and enable Shadows Culling or run the console command render_occluders_shadows 1.

Depending on the Back face parameter value, the front or back faces of the occluder are used to cull surfaces. the front faces of the occluder include all of the occluder sides that face the camera. The back faces of the occluder include the sides that are behind the front faces.

Schematically, the occluder faces can be shown as follows:

Front faces of the occluder
Back faces of the occluder

If any part of the bound of the object's surface is visible behind the occluder, the surface will not be culled.

See also#

  • General information on occluders
  • The WorldOccluder class to manage occluders via API
  • The sample <UnigineSDK>/data/samples/worlds/occluder_00

Creating Occluder#

To create an occluder via UnigineEditor:

  1. Run the project with UnigineEditor.
  2. On the Menu bar, click Create -> Optimization -> Occluder.

  3. Place the occluder in the world and specify the required parameters for it.

To display the buffer that is used for occluders displayed in the viewport, pass 1 to the render_show_occluder console command.

Editing Occluder#

On the Node tab of the Parameters window, you can adjust the following parameters of the occluder:

Edit Size Toggles the editing mode for the world occluder node on and off. When enabled, the occluder box sides that can be resized are highlighted with the colored rectangles. To change the size of a side, drag the corresponding rectangle.

Back Face Indicates whether the back faces of the occluder box are used instead of front faces to occlude objects. If unchecked, the front faces will be used.
Back face is unchecked
Back face is checked
Size Size of the occluder along the axes.
Distance Distance between the camera and the bounding box of the occluder, at which the occluder becomes disabled (it isn't processed by the CPU, hence it isn't rendered). For example, you should disable the occluder at a certain distance if it stops hiding the objects and their surfaces in order to increase performance. By default, the inf value is used.
Last update: 2019-02-14