sleight | etc | Runtime Evironment library

I'm using the offcanvas experiment code from Bootstrap 4 documentation, but it's not designed to close when you click outside the menu, which is something I would really like it to do.

I've tried several of the jquery snippets around the web, but they utilize bootstrap's .collapse and don't work when I edit them to contain the custom .offcanvas-collapse class.

TL;DR;

Google's new AR animals appear as if they are AR on the web (like AR.js or 8thWall), but are actually native ARCore applications. The sleight of hand is that a link in a browser (actually a button with a very obfuscated event handler chain) launches the ARCore app itself without any prompt for the user to install anything. How does Google do this? I want to do it too.

Detail

Recently Google introduced a search feature that allows users to view animals in AR by clicking a link from a search info card.

This is true plane-sensing, SLAM-tracking AR, no markers required. Viewing examples on my own phone (Pixel 2 running Android 9), the location and angle fidelity is impressive. I can move the phone around, walk around, and the tiger's foot (for example) stays anchored within a few inches. Likewise the AR objects have excellent visual stability, avoiding the shake that plagues most of the marker-based AR.js apps I've seen, or the mediocre object anchoring I see in 8th Wall's non-marker examples.

As a developer working on AR delivered over the web, I'm mighty curious how they pulled off such a high-quality result. Do they have far superior proprietary tech they're not sharing with the THREE.js / ARKit / AR.js open source projects?

No. Debugging into the the tiger example using USB remote inspection of my phone from my laptop, plus some circumstantial clues, I've concluded that they look so good because they are not web AR, but native AR using ARCore. Somehow Google causes the user's phone to load a native ARCore application (system logs make it appear is ARCore itself is being launched as an application) without any install prompt. Attempting to switch to another app causes the AR app to automatically close, making it difficult to debug or inspect it.

Google's own ARCore docs generally imply that you need to publish an app to the Play store to actually get ARCore enabled software into the hands of users. So, does anyone know how Google does what they're doing here?

All images are my original work

Info card link:

Prompt to grant app permissions to ARCore:

ARCore was just used:

I'm using com.tom_roush:pdfbox-android:1.8.10.1 version of PDFBox.

I have the following code.

I'm designing a Character Sheet from Dungeons & Dragons in Python, using Tkinter to take care of the graphical interface. However, I wanted to add an element (in this case a "proficiency" in a skill) to a list, if the checkbox corresponding to the same skill is active. The checkbox buttons are working for some commands like exit ("root.destroy") but this in particulary doesn't seem to do anything. I created a class Character, this Character has an empty Proficencies list and to add a proficiency to it, I created a function that did it whenever the matching checkbox value was set to True ("1")

Being a long-time Matlab user, I am accustomed to getting a caution whenever I build a list/array/anything with multiple elements in a loop such that it changes size every time, because that slows things down.

As I teach myself Python 2.7, I'm wondering if such a rule applies here to strings. I know exactly how long I want my string to be, and I have a specific list of the characters I want to build it from, but otherwise I want it to be random. My favorite code I've written so far is:

How do I move Spritz box to the top of page when it loads? Or, how do I remove all text from the page after Spritz gets the text? And, how can I make it so that anyone who visits the page can upload a .txt file for Spritz to read?

I'm trying to code a very simple web page in HTML, but I'm having some problems.

The end result of what I'm trying to do is that when my page finishes loading, nothing shows up except for the Spritz Box (see code below) which I want to start showing the words from the book (again, see code below).

The problems I am having is that the text is taking up too much space on the page (were talking about a couple hundred thousand words here, I removed a bunch for sake of this question). This causes problems with the area that Spritz shows up in (usually at the bottom of the massive page of text).