Class

SCNLookAtConstraint

A constraint that orients a node to always point toward a specified other node.

Declaration

@interface SCNLookAtConstraint : SCNConstraint

Overview

For example, you can use a look-at constraint to ensure that a camera or spotlight always follows the movement of a game character. To attach constraints to an SCNNode object, use its constraints property.

A node points in the direction of the negative z-axis of its local coordinate system. This axis defines the view direction for nodes containing cameras and the lighting direction for nodes containing spotlights or directional lights, as well as the orientation of the node’s geometry and child nodes. When Scene Kit evaluates a look-at constraint, it updates the constrained node’s transform property so that the node’s negative z-axis points toward the constraint’s target node.

Topics

Creating a Look-At Constraint

+ lookAtConstraintWithTarget:

Creates a look-at constraint for a specified target node.

Modifying a Constraint

gimbalLockEnabled

A Boolean value that specifies whether constrained nodes are allowed to rotate.

- target

The node toward which constrained nodes will point after being reoriented.

Instance Methods

Relationships

Inherits From

See Also

Orientation Constraints

SCNBillboardConstraint

A constraint that orients a node to always point toward the current camera.