how to use constraints

To use constraints in Reality Composer Pro, you can follow these steps:

1. Define Constraints for the Rig:

   • Parent Constraint: Constrains a joint's position and orientation.
   • Point Constraint: Constrains a joint's position.

   For example, you can set up two parent constraints and a point constraint to control the movement of a joint. This is useful for ensuring that the joint moves in a natural way and doesn't bend in unrealistic directions.

   Compose interactive 3D content in Reality Composer Pro (21:12)

2. Create and Configure an IK Rig:

   • Instantiate an IK rig and define how the inverse kinematics solver should work.
   • Add constraints to prevent unnatural movements, such as bending an elbow in the wrong direction.
   • Create an IK resource from the IK rig and add it to an entity.

   Compose interactive 3D content in Reality Composer Pro (19:12)

3. Use Physics Joints:

   • Joints connect two physics bodies together through constraints.
   • For example, a fixed joint disallows both translation and rotation, while a spherical joint allows for limited rotation around certain axes but no translation.

   Discover RealityKit APIs for iOS, macOS and visionOS (14:09)

4. Custom Joints:

   • If built-in joints do not meet your needs, you can create custom joints to constrain angular and linear motion separately.
   • For instance, you can create a custom joint that restricts angular motion around the X axis more than other axes to prevent excessive rotation.

   Discover RealityKit APIs for iOS, macOS and visionOS (17:11)

By following these steps, you can effectively use constraints to control the movement and interaction of 3D entities in Reality Composer Pro.