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<!DOCTYPE html><html lang="en-US"><head><title>Unity Cookbook. 2D Basics</title><meta property="og:title" content="Unity Cookbook. 2D Basics"><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container 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/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
* @size 4:3 960px 720px
*/div#\:\$p>svg>foreignObject>section,div#\:\$p>svg>foreignObject>section 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class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id=":$p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="1" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="11">
<h1 id="2d-basics">2D Basics</h1>
</section>
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<h2 id="using-unity-for-2d-games">Using Unity for 2D games</h2>
<ul>
<li data-marpit-fragment="1"><a href="https://docs.unity3d.com/Manual/2Dor3D.html">Manual: 2D or 3D</a></li>
<li data-marpit-fragment="2"><a href="https://docs.unity3d.com/Manual/2DAnd3DModeSettings.html">Manual: 2D and 3D Mode settings</a></li>
<li data-marpit-fragment="3"><a href="https://docs.unity3d.com/Manual/Quickstart2D.html">Manual: 2D Game Development Quickstart Guide</a>
<ul>
<li data-marpit-fragment="4"><a href="https://docs.unity3d.com/Manual/Quickstart2DSetup.html">Manual: Initial Setup for 2D Games</a></li>
</ul>
</li>
<li data-marpit-fragment="5">Unity is first and foremost a 3D engine (x, y, z)
<ul>
<li data-marpit-fragment="6">there is no dedicated 2D (x, y) mode</li>
</ul>
</li>
<li data-marpit-fragment="7">There is a dedicated <code>Vector2</code> class for 2D vectors
<ul>
<li data-marpit-fragment="8">Some vectors used in 2D, like <code>transform</code> are still <code>Vector3</code></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="3" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="11">
<h2 id="2d-project-template">2D Project template</h2>
<ul>
<li data-marpit-fragment="1">When creating a new project, you can choose a 2D project template</li>
<li data-marpit-fragment="2"><em><strong>IT'S STILL SECRETLY 3D</strong></em>, the z axis is just disregarded</li>
<li data-marpit-fragment="3">It basically just adjusts the Unity UI
<ul>
<li data-marpit-fragment="4">some 2D GameObject templates, like sprites and tilemaps available</li>
</ul>
</li>
<li data-marpit-fragment="5">You can change between 3D and 2D view modes by pressing the <em>2D</em> button in the Scene view</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-marpit-fragments="9" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="4" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="11">
<h2 id="useful-2d-gameobjects">Useful 2D GameObjects</h2>
<ul>
<li data-marpit-fragment="1">Sprites
<ul>
<li data-marpit-fragment="2"><a href="https://docs.unity3d.com/Manual/Sprites.html">Manual: Sprites</a></li>
<li data-marpit-fragment="3">See <a href="#sprite-renderer-component">Sprite Renderer component</a></li>
</ul>
</li>
<li data-marpit-fragment="4">2D Primitives
<ul>
<li data-marpit-fragment="5">For drawing basic shapes in 2D</li>
<li data-marpit-fragment="6"><a href="https://docs.unity3d.com/2020.3/Documentation/Manual/2DPrimitiveObjects.html">Manual: 2D Primitives</a></li>
</ul>
</li>
<li data-marpit-fragment="7">Sprite Shape Asset
<ul>
<li data-marpit-fragment="8">Curve-based graphics & collision</li>
<li data-marpit-fragment="9"><a href="https://docs.unity3d.com/Packages/[email protected]/manual/index.html">Manual: Sprite Shape</a></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="5" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="11">
<h2 id="camera-component">Camera component</h2>
<ul>
<li data-marpit-fragment="1">2D camera needs to be orthographic<br />
<img src="imgs/camera.png" alt="" /></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-marpit-fragments="8" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="6" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="11">
<h2 id="collision--physics-components">Collision & Physics components</h2>
<ul>
<li data-marpit-fragment="1">Colliders
<ul>
<li data-marpit-fragment="2">See: <a href="collision">Collision</a></li>
<li data-marpit-fragment="3">Remember to use the 2D versions of colliders:
<ul>
<li data-marpit-fragment="4">PolygonCollider <strong>2D</strong>, CircleCollider <strong>2D</strong>, ...</li>
</ul>
</li>
</ul>
</li>
<li data-marpit-fragment="5">RigidBody 2D
<ul>
<li data-marpit-fragment="6">See: <a href="physics">Physics</a></li>
</ul>
</li>
<li data-marpit-fragment="7">Effectors
<ul>
<li data-marpit-fragment="8"><a href="https://docs.unity3d.com/Manual/Effectors2D.html">Manual: Effectors 2D</a></li>
</ul>
</li>
</ul>
</section>
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<h2 id="sprite-renderer-component">Sprite Renderer component</h2>
<ul>
<li data-marpit-fragment="1">
<p>2d images in games are called <em><strong>sprites</strong></em></p>
</li>
<li data-marpit-fragment="2">
<p>They're drawn on screen with the <em><strong>Sprite Renderer</strong></em> component</p>
<p><img src="imgs/sprite-renderer.png" alt="" /></p>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-marpit-fragments="9" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="8" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="11">
<h3 id="example-using-sprite-assets">Example: Using Sprite Assets</h3>
<ol>
<li data-marpit-fragment="1">Create a .png image file</li>
<li data-marpit-fragment="2">Add it to your Assets folder</li>
<li data-marpit-fragment="3">Click it once to see its properties in the Inspector. Set the values:
<ul>
<li data-marpit-fragment="4">Set <em><strong>Texture type</strong></em> to <em>Sprite (2D and UI)</em></li>
<li data-marpit-fragment="5"><em><strong>Pixels per unit</strong></em> value tells how big the sprite should be on screen</li>
<li data-marpit-fragment="6">If you're using pixelart, you need to take some more things into consideration
<ul>
<li data-marpit-fragment="7">See: <a href="2d-animation#pixelart-in-unity">Pixelart in Unity</a></li>
</ul>
</li>
<li data-marpit-fragment="8">Click <em><strong>Apply</strong></em></li>
</ul>
</li>
<li data-marpit-fragment="9">Drag it from the Project window into the Sprite field in the Sprite Renderer component</li>
</ol>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-marpit-fragments="9" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="9" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="11">
<h2 id="other-renderer-components">Other renderer components</h2>
<ul>
<li data-marpit-fragment="1">Line Renderer
<ul>
<li data-marpit-fragment="2">Use for drawing a line on screen</li>
<li data-marpit-fragment="3"><a href="https://docs.unity3d.com/Manual/class-LineRenderer.html">Manual: Line Renderer</a></li>
</ul>
</li>
<li data-marpit-fragment="4">Trail Renderer
<ul>
<li data-marpit-fragment="5">For drawing trails</li>
<li data-marpit-fragment="6"><a href="https://docs.unity3d.com/Manual/class-TrailRenderer.html">Manual: Trail Renderer</a></li>
</ul>
</li>
<li data-marpit-fragment="7">Sprite Shape Renderer
<ul>
<li data-marpit-fragment="8">Draw images along a path, or just paths</li>
<li data-marpit-fragment="9"><a href="https://docs.unity3d.com/Manual/class-SpriteShapeRenderer.html">Sprite Shape Renderer</a></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-marpit-fragments="3" data-paginate="true" data-class="invert" data-background-color="#5d275d" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="10" style="--paginate:true;--class:invert;--background-color:#5d275d;--heading-divider:3;background-color:#5d275d;background-image:none;" data-marpit-pagination-total="11">
<h2 id="extra-two-ways-for-2d-shooting">Extra: Two ways for 2D shooting</h2>
<ul>
<li data-marpit-fragment="1"><a href="https://www.youtube.com/watch?v=wkKsl1Mfp5M">Brackeys video: 2D shooting</a></li>
<li data-marpit-fragment="2">For slow bullets: Instantiate a bullet prefab</li>
<li data-marpit-fragment="3">For instant hit: Raycasting (see example below)<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#">RaycastHit2D hit = Physics2D.Raycast(line.transform.position,
line.transform.up,
lineDistance);
</code></pre>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-paginate="true" data-class="invert" data-background-color="#5d275d" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="11" style="--paginate:true;--class:invert;--background-color:#5d275d;--heading-divider:3;background-color:#5d275d;background-image:none;" data-marpit-pagination-total="11">
<h2 id="extra-moving-on-a-grid">Extra: Moving on a grid</h2>
<p>For grid-based movement, see this thread: <a href="https://answers.unity.com/questions/1760651/how-to-make-a-grid-movement-tile-per-tile-1.html">Unity answers: Moving on a grid</a></p>
</section>
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