Call-back from the hit test: register an AR anchor at this position through Amazon Sumerian's ArSystem.

AnchorPositioning.js

// Hit test callback. If the hit test was successful (i.e., detected a
// point in the real world), registers an anchor with that point.
hitTestCallback(anchorTransform) {
	if (anchorTransform) {
		console.log("Transform from hit test: " + anchorTransform + ". Registering anchor...");
		this.arSystem.registerAnchor(anchorTransform, (anchorId) => this.registerAnchorCallback(anchorId));
	} else {
		console.log("No transform received from hit test");
	}
}