Vue (pronounced /vjuː/, like view) is a progressive framework for building user interfaces. Unlike other monolithic frameworks, Vue is designed from the ground up to be incrementally adoptable. The core library is focused on the view layer only, and is very easy to pick up and integrate with other libraries or existing projects. On the other hand, Vue is also perfectly capable of powering sophisticated Single-Page Applications when used in combination with modern tooling and supporting libraries.

Learn Vue

There are several components from the `@tresjs/cientos` that you can use to enhance your **TresJS 3D scenes**.

- `ContactShadows` for performant fake shadows
- Wrap models with `Levioso` for subtle floating animations
- Add real HTML markup to your animations with `HTML`

Using these abstractions from `@tresjs/cientos`, you can create polished **3D experiences**.

Enhance Your TresJS Scenes with the @tresjs/cientos Package

In this **TresJS** lesson you will see how to connect a 3D model to your application state. You'll learn to:

- Access your model's material colors using the `materials` property from `useGLTF`
- Use Vue's `watch` function to update the model's colors when the user changes the selection in the UI

This allows you to create an interactive 3D experience that responds to user input.

Connect a TresJS Model with Vue State

In this lesson, you'll learn how to create a reactive color selector in Vue using the `useState` composable function. We'll cover:

- Creating a shared state that contains base colors and a selected base color
- Using the `toRefs` utility to convert reactive properties to refs
- Importing and using the `useState` composable in components
- Iterating through colors to create buttons
- Assigning click event handlers to update the selected color reactively

Create a Reactive Color Selector in Vue with useState

In this **TresJS** tutorial, we'll explore how to find and use free 3D models in GLTF format from sites like:

- [poly.pizza](https://poly.pizza/)
- [Sketchfab](https://sketchfab.com/)
- [pmndrs Market](https://market.pmnd.rs/)

We'll then cover using the `useGLTF` composable from `drei-sfc` to load models asynchronously, handling it gracefully with Vue's `<Suspense>` component. 

Once loaded, you will see how to explore the object and get the model node you're looking for. Then, you'll pass that node to the Vue `primitive` component's `:object` prop to render the model. 

By the end of the lesson, you'll be ready to start adding awesome 3D models to your own TresJS projects!

Load Models with useGLTF and the TresJS primitive Component

This is an overview of the [TresJS project template](https://github.com/alvarosabu/egghead-tres-3D-product-configurator/tree/main/lessons/starter).

The template is styled with the atomic CSS framework, [UnoCSS](https://unocss.dev), and comes with a default TresJS scene setup, including:

- a perspective camera
- ambient light
- directional light

There is also a color selector initially implemented using an array of colors and a `ref` variable for the selected color. Each color is rendered as a circle. 

Project Overview of the TresJS Product Template

In this **TresJS** lesson you will learn how to use `OrbitControls` from the [@tresjs/cientos](https://cientos.tresjs.org/) package to add interactivity to your scenes by:

- Importing `OrbitControls`
- Adding it below your `TresPerspectiveCamera` component

The `@tresjs/cientos` package is part of the TresJS ecosystem and provides useful abstractions and composables to extend the core framework. 


Use OrbitControls to Interact with your TresJS Scene

In this **TresJS** lesson, we explore how to animate 3D objects in a scene using the render loop. 

We'll cover:

- Using the `useRenderLoop` composable and `onLoop` callback to run code every frame
- Creating refs with `useRef` to reference and modify 3D object properties like position and rotation
- Handling varying device frame rates with `delta` or `elapsed` time for consistent animation speed

By the end of the video, you'll be ready to create smooth animations in your own TresJS scenes.

Animate TresJS Objects with the useRenderLoop Composable

In this **TresJS** lesson, you'll learn how to **enable shadows** in your 3D scenes. 

We'll cover: 
- the `shadows` prop to turn on shadows
- the `cast-shadow` property for lights
- and the `cast-shadow` and `receive-shadow` properties for meshes. 

You will see how to adjust light intensity, position, and object placement to **control the appearance of shadows**. By the end, you'll understand the key aspects of configuring shadows in TresJS scenes.

Enable Shadows in Your TresJS Scene

This TresJS lesson teaches you the basics of lighting 3D scenes. 

You'll learn how to:

- add ambient lights for overall lighting `<TresAmbientLight />`
- add directional lights for light from a specific direction `<TresDirectionalLight />`
- change light color and intensity using theprops. 

You will also see how materials, such as the `<TresMeshStandardMaterial>`, work with the lights in your scene.

Add Ambient and Directional Lighting to Your TresJS Scene

This TresJS lesson shows you how to transform 3D objects in your scene. You'll learn how to:

*   Adjust an object's position with `TresMesh`'s `position`, `scale`, and `rotation` props   
*   Use the `TresAxesHelper` component to guide object transformations in 3D space
    

Transform TresJS Objects Using Props

Learn how to add a 3D cube to your TresJS scene using the `TresMeshComponent`, `TresBoxGeometry`, and `TresMeshNormalMaterial` components. 

This lesson shows TresJS's declarative approach that makes 3D rendering simpler than using plain Three.js.

Add a Cube to Your TresJS 3D Scene

[TresCanvas](https://docs.tresjs.org/api/tres-canvas) is a Vue.js component that wraps the Three.js renderer. 

It can be imported, added to templates, and customized with props like background color and window size.

Add a TresCanvas to Your Vue App

[Link to the course repo](https://github.com/alvarosabu/egghead-tres-3D-product-configurator)

Our goal is to create an application that allows the user to customize a 3D product with different color materials visually. The first step is setting up the starter to follow up during the course

In this first lesson, we will download the course repo ‣. The repo is a monorepo containing all the lessons available for this course. When you clone it you are going to find

Getting Started with the TresJS Product Course Repo

Create Interactive 3D Experiences with TresJS

Some components render differently based on the route they are rendered on. To use router within component tests, it is best to define its default values in `cy.mount()` function. Since we can customize this in any way we’d like, we can create a custom `path` attribute where we can pass our own routes and test our component behavior against them.

Test a Component Rendering Within Different Router Locations in Cypress Component Test

Every component test that uses Pinia needs to have Pinia imported and initialized. Instead of doing this separately for each test you can customize your `cy.mount()` command to automatically use a default store. You can further then customize it to use your own store in case you want to change its state.

Rewrite Cypress mount() Command to Provide a Default Store to all Components

Instead of calling an action function to change the state, we can choose to change it directly by importing the attributes from our store. In order to not loose reactivity while destructuring properties we can use `storeToRefs()` function.

Mutate Application State Properties Directly with Pinia’s storeToRefs()

Fast, easy and reliable testing for anything that runs in a browser.

cypress

When component uses a state management tool like Pinia, it needs to be defined within the test. To use Pinia inside the Cypress component test, we need to create a Pinia instance and pass it into our store. For changing the state we can call our actions directly from within our test and assert different attributes of the component with Cypress commands

Call Pinia Store Actions From Within a Cypress Component Test

`emit()` function enables components to communicate with one another. While this communication is a good candidate for end to end test, we can also test this in isolation within component. To do this, we’ll use `cy.spy()` function that will watch for the defined function call. Using this, we can confirm that our emitted event was actually invoked.

Use Cypress cy.spy() Function to Test a Vue 3 Component’s Emitted Events

By passing a `slots` option to our `cy.mount()` function, we can define content to be rendered inside our current component. We can use default or named components and eve use Vue’s `h()` function to create element and pass components with desired properties.

Render a Vue 3 Component with <slot /> and Test its Content Properties

Some components can have properties passed into them, For these, we can use an options parameter in our `cy.mount()` function and pass `props` attribute which will define the properties we want to pass into our component. This way we can test whether different properties correctly render out in our component.

Pass Properties Into a Vue 3 Component Within a Cypress Test

Mock Service Worker is an API mocking library that allows you to write client-agnostic mocks and reuse them across any frameworks, tools, and environments.



Mocking WebSocket APIs with Mock Service Worker


When attempting to load the same module twice in JavaScript you'll hit a cache and code won't re-run. In scenarios where you actually do want to have state in your modules, you'll have to use a cache-busting technique by passing a query parameter to a dynamic import. This lesson walks through how to add a query parameter, how to add the appropriate types for loading dynamic modules in TypeScript, and when these techniques are valuable.

Import the Same JavaScript Module Multiple Times with Cache Busting



The include keyword in GitHub Actions empowers you to add custom variables to your matrix strategy, providing flexibility beyond standard configurations. In this video, we'll explore how include allows you to define specific combinations of variables, enhancing control over your workflow runs. You'll see how this feature enables you to tailor jobs for unique environments or scenarios not covered by the default matrix options. By leveraging include, you can efficiently manage complex build processes with greater precision. This technique helps you streamline your CI/CD pipeline, making it more adaptable to your project's evolving needs.

Use GitHub Actions Matrix Include for Complex Job Configurations

While running `zod` schema validation agains domain-rich objects, the error message saying that _a string is not a number_ might not be really useful.

Especially, when you need to provide a meaningful feeback to the user, e.g. after they have submitted a form with lots of data.

`zod` allows to customize messages on a very granular level. We can also extract repeatable customization to `zod` error maps.

Finally, in order to process an error message further (e.g. display it to the user), we need to handle the `zod` validation errors effectively. Especially, when a big object validation has failed and we could receive a handful of errors.

That's what we learn in this lesson. 🔥

Customize zod Error Messages and Handle zod Errors Effectively

customize zod validation messages, customize zod schema property messages, reuse error maps across different schemas, navigate through zod error objects

You might want to run `zod` schema checks in different styles.

Sometimes you prefer to conditionally throw the error - that's what `parse` does. But another time you'd prefer to receive a `boolean` property that determines whether the validation was successful or not - and perform further actions accordingly.

Additionally, the error-throwing API of `parse` works extremely well with [TypeScript assertion functions](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#assertion-functions). Their combination is just... perfect! 👌

That's what we learn in this lesson.

Use parse and safeParse Runtime Type-checks with zod

use zod parse function to conditionally throw ZodError, use zod safeParse to get a boolean value and run typescript type guard over success property

In this lesson we learn that TypeScript cannot guarantee correct shapes of responses. That's due to TS performing checks in compile-time, while the response will be availbale in runtime - when TS doesn't exist anymore.

In some situations, such as HTTP requests, runtime type checks such as `zod` are essential for providing quick feedback around data-related errors.

Understand where are the possible mistakes to make while using TypeScript with HTTP calls. Use `fetch` and `axios` along with `zod` schema checks.

Also, note that similar mistakes or mistakes could happen while using web storage (e.g. `localStorage`)

Validate HTTP API Response with zod, fetch and axios

use zod as an HTTP response validation tool along with fetch and axios in order to make sure that the response has expected data structure

In this lesson we learn that the `zod` schemas become the single source of truth.

We shall not update TypeScript types manually, since they are generated automatically from the schema.

Same with validation functions.

Whenever the schema changes, all the rest will update accordingly. It's an important mind shift.

Treat zod Schemas as Single Source of Truth

Zod Schemas are the single source of truth for both typescript types, and interfaces - and runtime validation functions. Schemas should be updated first.

`zod` is powerful, but writing the schemas manually for existing JSON objects, especially big ones, can be time-consuming.

But that's what `quicktype` is for! You can get 80% work done instantly! 🥳

Depending on your need - whether you want to automate the process, or do it just one time, you can:
- use an online app
- use an IDE extension
- run a CLI script
- generate a script to be executed within CI/CD environment/tooling

And this is what we learn in this lesson! 🔥🔥🔥

Get started with zod quickly!

Generate zod Schemas Automatically using Quicktype App, Extensions and Scripts

Use quicktype app, extension or scripts to automatically generate zod schemas from existing json files. Save time and get started with zod quickly!

`zod` is a powerful library allowing to run runtime type-checks.

It's complementary to TypeScript, which does type checks in compile time.

In this lesson we create few schemas that represent primitive type values, along with `zod` utilities which make these more precise. We also create object schemas and nest one inside another.

All schemas are being validated against example values. We analyze how to interpret error messages in case of failures.

Perform Runtime Type-checks on Primitives and Objects with zod

Create zod schemas to validate primitive type and object type values in runtime. Analyze the errors to see how a value doesn't correspond to schema expectations


Using Cursor Chat, you can easily reference an entire directory of files and ask it to generate anything based on those files. This opens up the possibility of using your current code as a reference guide to create new code that follows existing patterns. With this approach, the result can be a polished prompt you can use with any AI to generate consistent and reliable output.

Focus less on crafting the perfect prompt upfront - what matters most is testing and iterating based on the AI's responses. The more results you see from the prompt, the more you can reinforce the good results and prune out the bad results until your prompt is polished enough that you can rely on the prompt to give you consistent quality results.


Vue.js

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