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  Relations include groups and constraints.

You use groups to organize objects and reactions in complex projects.

You use constraints to link objects together or to specify where objects can or cannot go in your World. Here are some examples of constraints:

  • A door turning on a hinge
  • A train moving along the tracks
  • A spot light following a character on stage

In this lesson, you add two types of constraints: a bounding box and a direction constraint.

Note: To make room for the lesson instructions, the Sequencer and Interaction Editor are hidden. You work in Single-view mode therefore only the WebCam viewport is visible. Starting on the next page, the instructions appear next to the 3D World in the WebCam viewport.

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