This section is about MotionBuilder constraints. In the real world, we are surrounded by constraints; for example gravity constrains us to the ground, or a dog is constrained by the length of his leash.

To simulate these limits in the 3D animation world, these relationships between objects must be established by the animator.

Constraints are tools used to create relationships between objects. You can use constraints to make a character pick up an object, have a camera follow a character, manipulate other objects in relation to each other or use the keyboard or mouse to trigger events.

This section covers MotionBuilder constraints, their settings, properties, and how you can use them to create relationships with models and animation.