Learn Anything: Defining Interactive 3D Environments and Customization
This article explores the concept of "learn anything" in the context of interactive 3D environments, specifically within platforms like Rooms.xyz. It delves into the fundamentals of customizing object behavior through programming, offering a shallow yet insightful tour of the programming model and Lua scripting basics.
Introduction to Interactive 3D Environments
A room is a small interactive 3D environment. If you're not into rooms or interactive 3D environments, oh boy, you're not going to enjoy Rooms.xyz. These environments offer a space for creativity and interaction, allowing users to build and explore virtual worlds. Within these rooms exist "Things," which are the objects that populate the environment.
What is a Thing?
A Thing is an object. Each of the objects in the room is a Thing. In essence, everything within the room is a Thing, including seemingly fundamental elements like the walls and floor. Understanding what makes a Thing behave the way it does is crucial to customizing these interactive spaces.
The Power of Code: Customizing Thing Behavior
Spoiler alert: it's code. The behavior of each Thing is dictated by code, specifically Lua scripting. By accessing the code editor for a Thing, users can input Lua code to define its actions and reactions within the environment. Lua is a lovely scripting language created by a Brazilian. Think of Lua as Javascript without the annoying parts.
Getting Started with Lua Scripting
When first accessing the code editor, users are prompted to select a template to avoid starting from scratch. The "Hello" template provides a basic example of how to make an object interactive.
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Saying Hello: A Simple Interaction
The "Hello" template contains a simple script that makes the object say “Hello” when clicked. The code looks like this:
-- This function runs when the user clicks.function onClick() say("Hello")endBy modifying the string within the say() function, users can customize the object's response to a click.
Handlers: Predefined Functions for Interaction
Handlers are predefined functions that trigger specific actions within the environment. The onClick() function, as seen in the "Hello" template, is one such handler that executes when a user clicks on a Thing. Every Thing can have its own onClick function.
Examples of Handler Functions
Some other examples of handler functions are:
onStart(): gets called when the room starts.onCollision(): gets called when the Thing collides against another Thing.onButtonDown(): gets called when a virtual joystick button is pressed.onButtonUp(): gets called when a virtual joystick button is released.onUpdate(): gets called once per frame (60 times per second).
These handlers allow for a wide range of interactive behaviors, from responding to collisions to updating animations.
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The onStart() Function: Initializing Behavior
The onStart() function is useful if you want to do something when the room starts independently of user action. For example:
-- This function runs when the room starts.function onStart() say("Click me!")end-- This function runs when the user clicks.function onClick() say("Thanks for clicking")endThis code will make the object say "Click me!" when the room starts and "Thanks for clicking" when the user clicks on it.
Moving Things Around: Physics and Coordinate Systems
To manipulate objects within the 3D environment, it's important to understand the physics and coordinate system.
Kinematic vs. Dynamic Physics
Make sure the object you're working on is set to Kinematic as its Physics type. Kinematic objects do what you want. Dynamic (non-kinematic) objects do what they want. Kinematic objects allow for precise control over movement, while dynamic objects are influenced by physics simulations.
Coordinate System
The Room coordinate system is:
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- +Z is towards the left wall
- +X is towards the right wall
- +Y is upwards
The cardinal directions are:
- "north" means towards +Z
- "east" means towards +X
- "south" means towards -Z
- "west" means towards -X
- "up" means towards +Y
- "down" means towards -Y
The center of the room is (0, 0, 0). That's the point on the floor at the center of the room.
The startMoveBy() Function
The startMoveBy() function takes a delta (x, y, z) and a total time and moves the object as requested. For example:
-- This function runs when the user clicks.function onClick() say("Here we go") -- Move 30 units south in 1 second. startMoveBy(0, 0, -30, 1)endThis code will make the object move 30 units south in 1 second when clicked.
Stopping Movement
The stopMove() function will stop a motion started by startMoveBy().
Toggling Movement
This example illustrates how to call stopMove() to stop a motion started by startMoveBy(), and also shows how to have a boolean variable that lets us keep track of the state of the car (moving or not moving). Here's the code:
moving = false-- This function runs when the user clicks.function onClick() if moving then stopMove() moving = false else startMoveBy(0, 0, -48, 10) moving = true endendThis code will make the object move south when clicked, and stop moving when clicked again.
Sequencing: Controlling the Order of Events
To execute multiple actions in a specific order, the wait() function is used. It will wait for a given number of seconds and then call another function.
Example of Sequencing
function onClick() -- Move 20 units south, in 1 second. startMoveBy(0, 0, -20, 1) -- This waits 1 second (the time it takes to move) -- and then calls moveWest wait(1, moveWest)endfunction moveWest() -- Move 20 units west, in 1 second. startMoveBy(-20, 0, 0, 1) -- This waits 1 second (the time it takes to move) -- and then calls sayDone wait(1, sayDone)endfunction sayDone() say("Done") -- Start to spin around. startSpin()endThis code will first move the object south, then west, then say "Done", and then start to spin.
The every() Function: Repeating Actions
The every() function allows you to call a function repeatedly at a set interval.
Example of every() Function
c = 0function onStart() -- Call the count() function every 1 second. every(1, count)endfunction count() c = c + 1 say(c .. " sheep")endThis code will make the object say "1 sheep", then "2 sheep", then "3 sheep", and so on, every second.
Meta-Learning and Accelerated Skill Acquisition
The principles of "learn anything" extend beyond the realm of interactive 3D environments. Meta-learning, the process of learning how to learn, allows individuals to rapidly acquire new skills.
DiSSS: Deconstruction, Selection, Sequencing, Stakes
- Deconstruction: Identify the minimal learnable units to begin with.
- Selection: Determine the most critical 20% of the information to focus on.
- Sequencing: Establish the optimal order for learning the blocks.
- Stakes: Create real consequences to guarantee adherence to the program.
CaFE: Compression, Frequency, Encoding
- Compression: Encapsulate the most important information into an easily graspable format.
- Frequency: Determine the minimum effective dose (MED) for practice volume.
- Encoding: Anchor new material to existing knowledge for rapid recall.
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