Lecture 6: Unity

# Creación de Videojuegos

### Unity

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# Unity - Introduction

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# Unity

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# Unity

Used for:

* Hearthstone
  
  * Pokemon Go
  
  * realMyst: Masterpiece Edition
  
  * Temple Run
  
  * Rust
  
  * SYNTHIA
  
  * etc.

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# Unity - Scene view

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# Unity - Scene hierarchy

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# Unity - Inspector

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# Unity - Project

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# Unity - Basics

* A "level" in Unity is called a *Scene*
  
  * A scene consists of *Game Objects* in a hierarchy
  
  * Each game object has multiple *Components*
  
     - Transform
     - Geometry
     - Physics
     - Scripts
     
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# Physics

Remember physics?

$$
\vec{v} = \int \vec{a} \cdot \operatorname{d}t
$$

$$
\vec{s} = \int \vec{v} \cdot \operatorname{d}t
$$

$$
\vec{a} = 9.81 \frac{m}{s^2} \cdot \operatorname{down}
$$

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# Discretized Physics

What if we have a loop that increments time by some small amount?

$$
\vec{v} = \sum \vec{a} \cdot \Delta t
$$

$$
\vec{s} = \sum \vec{v} \cdot \Delta t
$$

$$
\vec{a} = 9.81 \frac{m}{s^2} \cdot \operatorname{down}
$$

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# Discretized Physics in code

Very easy to do in Unity:

```C#
acceleration = -9.81 * Vector3.up;

velocity += acceleration * Time.deltaTime;

transform.position += velocity * Time.deltaTime;
```

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# Discretized Physics in code

Problems to solve:

* 2D?

* Set acceleration to a better value
   
   * Handle user input (move sideways?)
   
   * Collisions?
     
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# Demo time

## Get the demo project on github: <br/><a href="https://github.com/yawgmoth/UnityDemo2D"> https://github.com/yawgmoth/UnityDemo2D</a>

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# Assets

* <a href="https://assetstore.unity.com/packages/essentials/asset-packs/standard-assets-32351">Unity Standard Assets</a> (terrain textures, water, vehicles, a 2D character, code samples, etc. You probably want this)
  * <a href="https://assetstore.unity.com/packages/2d/environments/free-platform-game-assets-85838">2D platform assets</a> (character, blocks, enemies, coins, etc.)
  * <a href="https://assetstore.unity.com/packages/2d/characters/sunny-land-103349">Another pack of 2D platform assets</a>
  * <a href="https://assetstore.unity.com/packages/3d/characters/easyroads3d-free-v3-987">Roads</a> (Free package with some restrictions; should work well for a racing game)
  * <a href="https://assetstore.unity.com/packages/3d/environments/fantasy/mega-fantasy-props-pack-87811">Fantasy props</a> (walls, benches, etc.)
  * <a href="https://assetstore.unity.com/packages/3d/environments/fantasy/medieval-town-exteriors-free-27026">Medieval town exterior</a> (buildings, well, buckets, etc.)
  * <a href="https://assetstore.unity.com/packages/3d/characters/humanoids/fantasy-monster-skeleton-35635">Animated 3D Skeleton</a>
  * Search with "price:0" to find free assets!
  
  * My recommendation: Use art assets, but don't use code. You'll have to debug it when something goes wrong.

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# References

* <a href="https://unity3d.com">Unity 3D</a>
  
  * <a href="https://unity3d.com/es/learn/tutorials">Unity Tutorials</a>
  
  * <a href="https://github.com/Unity-Technologies/2d-extras">Unity 2D Extras</a> (Tilemap extensions)
  
  * <a href="https://unity3d.com/es/learn/tutorials/topics/2d-game-creation/intro-2d-world-building-w-tilemap">Unity 2D Tilemap Video Tutorial</a>