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World Trigger

A world trigger is a cuboid shaped object, which fires callbacks when any node (physical or not) gets inside or outside of it. The trigger can detect a node of any type by its bound object and can be used to access node's components and parameters.

Notice
Some "abstract" objects do not have bounds; therefore, they do not interact with World Trigger (regardless of the Triggers Interaction option state):

World Trigger affecting meshes

See also#

  • WorldTrigger class to manage World Trigger via API
  • A set of samples located in the data/samples/worlds folder:

    1. trigger_01
    2. trigger_02

Creating a World Trigger#

To create World Trigger via UnigineEditor:

  1. On the Menu bar, choose Create -> Logic -> World Trigger

  2. Place the node in the scene.

Editing a World Trigger#

In the Node tab of the Parameters window, you can adjust the following parameters of World Trigger:

Node tab of the World Trigger node

Bounding Box Parameters#

A set of bounding box parameters:

Edit Size

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

Touch Toggles the touch mode for World Trigger on and off. With this mode on, World Trigger reacts to the node at a partial contact. Otherwise, World Trigger reacts only if the whole bounding box gets inside it.
Size The size of the World Trigger bounding box along the X, Y, and Z axes, in units.

Setting Up Callbacks#

To add an enter or leave callback, write a callback function that receives a Node as its first argument. Then use the addEnterCallback or addLeaveCallback method to specify the function to be called.

Source code (C++)
// add the enter callback to be fired when a node enters World Trigger
worldTrigger->addEnterCallback(MakeCallback(this, &AppWorldLogic::enter_callback));
// add the leave callback to be fired when a node leaves World Trigger
worldTrigger->addLeaveCallback(MakeCallback(this, &AppWorldLogic::leave_callback));
Source code (C#)
// add the enter callback to be fired when a node enters World Trigger
worldTrigger.AddEnterCallback(enter_callback);
// add the leave callback to be fired when a node leaves World Trigger
worldTrigger.AddLeaveCallback(leave_callback);
Last update: 2021-05-26
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