SCNTransformConstraint
A constraint that runs a specified closure, block in Objective-C, to compute a new transform (position, rotation, and scale) for each node that the constraint affects.
Declaration
class SCNTransformConstraintOverview
To attach constraints to an SCNNode object, use its constraints property.
When Scene Kit prepares to render a scene, it evaluates the list of constraints attached to each node to determine the transformation for that node, then applies the new transformation before rendering. To evaluate a transform constraint, Scene Kit runs the block you provided when creating the constraint. In this block, your app computes a new transformation to be applied to the node. Optionally, your app may reference the node’s current transformation in computing the new transformation.