Sceneform SDK for Android was open sourced and archived (github.com/google-ar/sceneform-android-sdk) with version 1.16.0.
This site (developers.google.com/sceneform) serves as the documentation archive for the previous version, Sceneform SDK for Android 1.15.0.
Do not use version 1.17.0 of the Sceneform Maven artifacts.
The 1.17.1 Maven artifacts can be used. Other than the version, however, the 1.17.1 artifacts are identical to the 1.15.0 artifacts.

HitTestResult

Page Summary

HitTestResult stores the results of Scene hit tests, providing information about the hit.
It contains data about the hit node, distance to the hit, and the hit location in world-space.
You can access this information via getNode(), getDistance(), and getPoint() methods respectively.
Primarily used with Scene.hitTest and Scene.hitTestAll for detecting collisions in AR scenes.

public class HitTestResult

Stores the results of calls to Scene.hitTest and Scene.hitTestAll. Contains a node that was hit by the hit test, and associated information.

HitTestResult()

float	getDistance() Get the distance along the ray to the impact point on the surface of the collision shape.
Node	getNode() The node that was hit by the hit test.
Vector3	getPoint() Get the position in world-space where the ray hit the collision shape.

From class java.lang.Object

Get the distance along the ray to the impact point on the surface of the collision shape.

The node that was hit by the hit test. Null when there is no hit.

Get the position in world-space where the ray hit the collision shape.

a new vector that represents the position in world-space that the hit occurred at