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.

FrameTime

AI-generated Key Takeaways

FrameTime provides time information for the current frame, such as start time and duration.
It offers methods to get the time elapsed since the last frame (getDeltaSeconds, getDeltaTime).
It also provides methods to get the starting time of the current frame (getStartSeconds, getStartTime).
Time values can be retrieved in seconds or other units using TimeUnit.

public class FrameTime

Provides time information for the current frame.

float	getDeltaSeconds() Get the time in seconds between this frame and the last frame.
long	getDeltaTime(TimeUnit unit) Get the time between this frame and the last frame.
float	getStartSeconds() Get the time in seconds when this frame started.
long	getStartTime(TimeUnit unit) Get the time when this frame started.

From class java.lang.Object

Get the time in seconds between this frame and the last frame.

Get the time between this frame and the last frame.

unit	The unit time will be returned in

Get the time in seconds when this frame started.

Get the time when this frame started.

unit	The unit time will be returned in