Can ARCore be used to measure object, room, structure or distances between points in an area that aren't in the same frame?

Question

I understand that the below quote is very correct for the Project Google Tango:

By combining Depth Perception with Motion Tracking, the device can measure distances between points in an area that aren't in the same frame.

Based on the above, below are a few questions:

1. Can ARCore be used to measure the distance as the Project Google Tango does?

2. How accurate is the result in comparison to the Project Google Tango?

Answer 1

Ian M partially answers the first part of your question with this answer. Here's how you might do it:

Pose startPose = startAnchor.getPose();
Pose endPose = hitResult.getHitPose();

// Clean up the anchor
session.removeAnchors(Collections.singleton(startAnchor));
startAnchor = null;

// Compute the difference vector between the two hit locations.
float dx = startPose.tx() - endPose.tx();
float dy = startPose.ty() - endPose.ty();
float dz = startPose.tz() - endPose.tz();

// Compute the straight-line distance.
float distanceMeters = (float) Math.sqrt(dx*dx + dy*dy + dz*dz);