AR Playground

Checking AR support…

Use it on an Android phone or tablet, in Chrome with ARCore.
Enter virtual world with calibration by placing a flat square of known side length on a textured floor, entering its side length in millimeters and tapping three consecutive corners with the center reticle in perimeter order, or let it recognize the square by itself under good conditions. The square sets scale and origin.
Widget shows compass with directions (north, south, east, west, up).
Place more entry squares (anchors) around a home, and jump into the virtual world at any of them.
Drop breadcrumbs as you walk, then look back through the camera to see the line you moved along.
Tap anywhere (the center circle is the pointer) to add a virtual point: tap again from a spot at least 15 cm away to triangulate it, and see its distance from the anchor.
Add more points to measure the distance between two points, and add up the distance along a series of points.
Project planes through three points, see where they meet the floor, and project further points onto them with one ray, or place them freely with a second view.
Close a series of points on a plane into a loop to get its area; close a solid 3D shape to get its volume.
Create 3D objects from points: three points make a triangle; join more points into sides and triangles to build a mesh of any shape.
Save a point as an object, with a photo and a name, to remember where you put things (which drawer holds what) and see it again through the phone.
Turn on object recognition to have the camera mark what it sees, in about 80 categories such as bottle, bin, car, person, oven, microwave, TV, phone and chair; turn on Auto log to save what it sees to the catalog.
Fetch shops, pubs, petrol stations, parks, libraries and so on (or all of them) within a chosen radius from the internet, see where they are through the camera, and save them among your objects.
See on a map where you are and where your objects are.
Keep separate worlds (one flat, another flat, a garage, a shop); when two are found to be connected by shared objects and the like, link or merge them into one.
Choose the voice, and have objects read aloud during recognition when you approach one and/or point the reticle at it.
Export a world to a JSON file, then open, inspect and edit it on a big screen in the desktop Viewer.
Use it to remember where you put things away, or to take stock in a company: enter a product code and an arrow leads you to it.
How it works: ARCore keeps tracking the phone after the square leaves view. Adjacent sides of the square should be equal and meet at a right angle; the fourth corner is derived, not tapped.
Axes extend 50 m in each direction, with marks every 10 cm. The 10 cm floor grid, with heavier lines every 0.5 m and heavier still every meter, continues without limit, drawn as a 50 m x 50 m window around you.
The trace keeps every sample; when 3,000 are drawn it is thinned to 2,000 evenly spread ones, then grows again.
Tapping offers Add point, or the actions for a point or object under the circle. Free-space points are triangulated with two views each, with no limit on their number. Plane shows a 100 mm grid. Every section is labelled section / up to here / total.
Everything else is under Menu (Virtual points, World, Features, View, Data). Clear points or recalibration removes the points and measured geometry; physical AR accuracy requires device testing.