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  <section id="using-a-prefab-as-a-black-box">
<h1>Using a prefab as a black box<a class="headerlink" href="#using-a-prefab-as-a-black-box" title="Link to this heading"></a></h1>
<p>At this moment, the <a class="reference external" href="../scene-editor/index.html">Scene Editor</a> supports a small subset of the object types present in the <a class="reference external" href="https://photonstorm.github.io/phaser3-docs/">Phaser API</a>. Eventually, we will implement support for all the built-in object types.</p>
<p>However, if you need to add to the scene an object of an unsupported type (a <a class="reference external" href="https://phaser.io">Phaser</a> object type or any other no fully supported by <a class="reference external" href="https://phaser.io">Phaser</a>) you can “cheat” the <a class="reference external" href="../scene-editor/index.html">Scene Editor</a> using a <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> as a black box.</p>
<p>A <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> as a black box is a very simple concept: it is a <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> that is not compiled by the <a class="reference external" href="../scene-editor/scene-compiler.html">scene compiler</a>, so you should write the code of the <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> class manually.</p>
<p>For example, let’s say you want to add to the scene some objects with a texture that is generated on the fly, with shapes of random colors and positions. Let’s name them “doodles”.</p>
<p>First, create a texture similar to what you want, at least, with the same dimensions (100x100 in this example).</p>
<p>Something like this:</p>
<img alt="A reference image for the custom object." src="../_images/scene-editor-prefab-black-box-doodle.webp" />
<p>It is a reference texture. Upload it to the project and add it to the <a class="reference external" href="../asset-pack-editor/asset-pack-file.html">Asset Pack file</a>. You can create a new <a class="reference external" href="../asset-pack-editor/asset-pack-file.html">Asset Pack file</a> that will be used only by the editor, so you can exclude it from the distribution build of the game.</p>
<p>So, create a <strong>Doodle</strong> <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> with the <strong>doodle</strong> texture:</p>
<img alt="Add the doodle image to the prefab file." src="../_images/scene-editor-prefab-black-box-1.webp" />
<p>We have our <a class="reference external" href="../scene-editor/prefabs.html">prefab</a>. But you want to generate the texture on the fly. To do this, first disable the compilation of the scene, in the <a class="reference external" href="scene-compiler-general-settings.html">Scene compiler settings</a>:</p>
<img alt="Disable code generation." src="../_images/scene-editor-prefab-black-box-2.webp" />
<p>Now that you disabled the code compilation, you have to write the <code class="docutils literal notranslate"><span class="pre">Doodle</span></code> class in the <code class="docutils literal notranslate"><span class="pre">Doodle.js</span></code> file. It is a simple class, it extends the <a class="reference external" href="https://photonstorm.github.io/phaser3-docs/Phaser.GameObjects.Image.html">Phaser.GameObjects.Image</a> but instead of a real image texture it will generate its texture, on the fly:</p>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">class</span><span class="w"> </span><span class="nx">Doodle</span><span class="w"> </span><span class="k">extends</span><span class="w"> </span><span class="nx">Phaser</span><span class="p">.</span><span class="nx">GameObjects</span><span class="p">.</span><span class="nx">Image</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="k">static</span><span class="w"> </span><span class="nx">ID</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0</span><span class="p">;</span>
<span class="w">    </span><span class="k">static</span><span class="w"> </span><span class="nx">COLORS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="s2">&quot;red&quot;</span><span class="p">,</span><span class="w"> </span><span class="s2">&quot;blue&quot;</span><span class="p">,</span><span class="w"> </span><span class="s2">&quot;orange&quot;</span><span class="p">];</span>

<span class="w">    </span><span class="cm">/**</span>
<span class="cm">     * @param scene {Phaser.Scene}</span>
<span class="cm">     */</span>
<span class="w">    </span><span class="kr">constructor</span><span class="p">(</span><span class="nx">scene</span><span class="p">,</span><span class="w"> </span><span class="nx">x</span><span class="p">,</span><span class="w"> </span><span class="nx">y</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">super</span><span class="p">(</span><span class="nx">scene</span><span class="p">,</span><span class="w"> </span><span class="nx">x</span><span class="p">,</span><span class="w"> </span><span class="nx">y</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// create a new texture key</span>
<span class="w">        </span><span class="nx">Doodle</span><span class="p">.</span><span class="nx">ID</span><span class="o">++</span><span class="p">;</span>
<span class="w">        </span><span class="kd">const</span><span class="w"> </span><span class="nx">key</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;doodle-&quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="nx">Doodle</span><span class="p">.</span><span class="nx">ID</span><span class="p">;</span>

<span class="w">        </span><span class="c1">// create a new canvas-based texture and add it</span>
<span class="w">        </span><span class="c1">// to the TextureManager with the new key</span>
<span class="w">        </span><span class="kd">const</span><span class="w"> </span><span class="nx">texture</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">scene</span><span class="p">.</span><span class="nx">textures</span><span class="p">.</span><span class="nx">createCanvas</span><span class="p">(</span><span class="nx">key</span><span class="p">,</span><span class="w"> </span><span class="mf">200</span><span class="p">,</span><span class="w"> </span><span class="mf">200</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// get the context of the texture and draw the random doodle</span>
<span class="w">        </span><span class="kd">const</span><span class="w"> </span><span class="nx">ctx</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">texture</span><span class="p">.</span><span class="nx">getContext</span><span class="p">();</span>

<span class="w">        </span><span class="nx">ctx</span><span class="p">.</span><span class="nx">strokeStyle</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;black&quot;</span><span class="p">;</span>

<span class="w">        </span><span class="c1">// draw 5 shapes</span>
<span class="w">        </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kd">let</span><span class="w"> </span><span class="nx">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0</span><span class="p">;</span><span class="w"> </span><span class="nx">i</span><span class="w"> </span><span class="o">&lt;</span><span class="w"> </span><span class="mf">5</span><span class="p">;</span><span class="w"> </span><span class="nx">i</span><span class="o">++</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>

<span class="w">            </span><span class="nx">ctx</span><span class="p">.</span><span class="nx">save</span><span class="p">();</span>

<span class="w">            </span><span class="c1">// add a little rotation to the shape</span>
<span class="w">            </span><span class="kd">const</span><span class="w"> </span><span class="nx">angle</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">Phaser</span><span class="p">.</span><span class="nb">Math</span><span class="p">.</span><span class="nx">RND</span><span class="p">.</span><span class="nx">integerInRange</span><span class="p">(</span><span class="o">-</span><span class="mf">10</span><span class="p">,</span><span class="w"> </span><span class="mf">10</span><span class="p">);</span>
<span class="w">            </span><span class="nx">ctx</span><span class="p">.</span><span class="nx">rotate</span><span class="p">(</span><span class="nx">Phaser</span><span class="p">.</span><span class="nb">Math</span><span class="p">.</span><span class="nx">DegToRad</span><span class="p">(</span><span class="nx">angle</span><span class="p">));</span>

<span class="w">            </span><span class="nx">ctx</span><span class="p">.</span><span class="nx">beginPath</span><span class="p">();</span>

<span class="w">            </span><span class="c1">// draw a rect, at a random position with a random size</span>
<span class="w">            </span><span class="nx">ctx</span><span class="p">.</span><span class="nx">rect</span><span class="p">(</span>
<span class="w">                </span><span class="nx">Phaser</span><span class="p">.</span><span class="nb">Math</span><span class="p">.</span><span class="nx">RND</span><span class="p">.</span><span class="nx">integerInRange</span><span class="p">(</span><span class="mf">0</span><span class="p">,</span><span class="w"> </span><span class="mf">50</span><span class="p">),</span>
<span class="w">                </span><span class="nx">Phaser</span><span class="p">.</span><span class="nb">Math</span><span class="p">.</span><span class="nx">RND</span><span class="p">.</span><span class="nx">integerInRange</span><span class="p">(</span><span class="mf">0</span><span class="p">,</span><span class="w"> </span><span class="mf">50</span><span class="p">),</span>
<span class="w">                </span><span class="nx">Phaser</span><span class="p">.</span><span class="nb">Math</span><span class="p">.</span><span class="nx">RND</span><span class="p">.</span><span class="nx">integerInRange</span><span class="p">(</span><span class="mf">20</span><span class="p">,</span><span class="w"> </span><span class="mf">50</span><span class="p">),</span>
<span class="w">                </span><span class="nx">Phaser</span><span class="p">.</span><span class="nb">Math</span><span class="p">.</span><span class="nx">RND</span><span class="p">.</span><span class="nx">integerInRange</span><span class="p">(</span><span class="mf">20</span><span class="p">,</span><span class="w"> </span><span class="mf">50</span><span class="p">));</span>

<span class="w">            </span><span class="c1">// fill it with a random color</span>
<span class="w">            </span><span class="kd">const</span><span class="w"> </span><span class="nx">color</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">Phaser</span><span class="p">.</span><span class="nb">Math</span><span class="p">.</span><span class="nx">RND</span><span class="p">.</span><span class="nx">pick</span><span class="p">(</span><span class="nx">Doodle</span><span class="p">.</span><span class="nx">COLORS</span><span class="p">);</span>
<span class="w">            </span><span class="nx">ctx</span><span class="p">.</span><span class="nx">fillStyle</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">color</span><span class="p">;</span>

<span class="w">            </span><span class="nx">ctx</span><span class="p">.</span><span class="nx">fill</span><span class="p">();</span>
<span class="w">            </span><span class="nx">ctx</span><span class="p">.</span><span class="nx">stroke</span><span class="p">();</span>

<span class="w">            </span><span class="nx">ctx</span><span class="p">.</span><span class="nx">restore</span><span class="p">();</span>
<span class="w">        </span><span class="p">}</span>

<span class="w">        </span><span class="c1">// needed if the game is using the WebGL renderer</span>
<span class="w">        </span><span class="nx">texture</span><span class="p">.</span><span class="nx">refresh</span><span class="p">();</span>

<span class="w">        </span><span class="c1">// set the new texture to the object</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">setTexture</span><span class="p">(</span><span class="nx">key</span><span class="p">);</span>
<span class="w">    </span><span class="p">}</span>

<span class="p">}</span>
</pre></div>
</div>
<p>The <strong>Doodle</strong> <a class="reference external" href="../scene-editor/prefabs.html">prefab</a> is ready. Open the <strong>Level</strong> scene file and add a couple of <strong>Doodle</strong> <a class="reference external" href="../scene-editor/prefab-create-instance.html">prefab instances</a> to it:</p>
<img alt="The Doodle prefab instances in the level scene." src="../_images/scene-editor-prefab-black-box-3.webp" />
<p>Note all <strong>Doodle</strong> instances look the same. The custom code you wrote is executed in the game, not in the editor. The editor is using the <code class="docutils literal notranslate"><span class="pre">doodle.png</span></code> image you created as a reference.</p>
<p>Look in the <code class="docutils literal notranslate"><span class="pre">Level.js</span></code> file: the <a class="reference external" href="../scene-editor/prefab-create-instance.html">prefab instances</a> are created as expected.  The trick here is that the code inside the <strong>Doodle</strong> constructor is your code, not the code generated by the <a class="reference external" href="../scene-editor/scene-compiler.html">scene compiler</a>. You only need to write a constructor signature that is compatible with the code of the <code class="docutils literal notranslate"><span class="pre">Level.js</span></code> file:</p>
<div class="highlight-javascript notranslate"><div class="highlight"><pre><span></span><span class="kd">class</span><span class="w"> </span><span class="nx">Level</span><span class="w"> </span><span class="k">extends</span><span class="w"> </span><span class="nx">Phaser</span><span class="p">.</span><span class="nx">Scene</span><span class="w"> </span><span class="p">{</span>

<span class="w">    </span><span class="kr">constructor</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w">        </span><span class="k">super</span><span class="p">(</span><span class="s2">&quot;Level&quot;</span><span class="p">);</span>

<span class="w">    </span><span class="p">}</span>

<span class="w">    </span><span class="nx">create</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>

<span class="w">        </span><span class="c1">// ...</span>

<span class="w">        </span><span class="c1">// doodle</span>
<span class="w">        </span><span class="kd">const</span><span class="w"> </span><span class="nx">doodle</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ow">new</span><span class="w"> </span><span class="nx">Doodle</span><span class="p">(</span><span class="k">this</span><span class="p">,</span><span class="w"> </span><span class="mf">388</span><span class="p">,</span><span class="w"> </span><span class="mf">105</span><span class="p">);</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">add</span><span class="p">.</span><span class="nx">existing</span><span class="p">(</span><span class="nx">doodle</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// doodle_1</span>
<span class="w">        </span><span class="kd">const</span><span class="w"> </span><span class="nx">doodle_1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ow">new</span><span class="w"> </span><span class="nx">Doodle</span><span class="p">(</span><span class="k">this</span><span class="p">,</span><span class="w"> </span><span class="mf">380</span><span class="p">,</span><span class="w"> </span><span class="mf">240</span><span class="p">);</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">add</span><span class="p">.</span><span class="nx">existing</span><span class="p">(</span><span class="nx">doodle_1</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// doodle_2</span>
<span class="w">        </span><span class="kd">const</span><span class="w"> </span><span class="nx">doodle_2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="ow">new</span><span class="w"> </span><span class="nx">Doodle</span><span class="p">(</span><span class="k">this</span><span class="p">,</span><span class="w"> </span><span class="mf">530</span><span class="p">,</span><span class="w"> </span><span class="mf">170</span><span class="p">);</span>
<span class="w">        </span><span class="k">this</span><span class="p">.</span><span class="nx">add</span><span class="p">.</span><span class="nx">existing</span><span class="p">(</span><span class="nx">doodle_2</span><span class="p">);</span>

<span class="w">        </span><span class="c1">// ...</span>
<span class="w">    </span><span class="p">}</span>

<span class="p">}</span>
</pre></div>
</div>
<p>So, run the game now: you will see the <strong>Doodle</strong> instances are rendered with random shapes and colors. The instances are using your custom code and your way to create the textures:</p>
<img alt="The different doodles in the game." src="../_images/scene-editor-prefab-black-box-4.webp" />
<p>This “black box” trick is not perfect. An ideal editor should run your <strong>Doodle</strong> custom code and show the <a class="reference external" href="../scene-editor/prefab-create-instance.html">prefab instances</a> in the <a class="reference external" href="../scene-editor/index.html">Scene Editor</a> with the custom textures. But it is something very complex to implement.</p>
<p>With a black box <a class="reference external" href="../scene-editor/prefabs.html">prefab</a>, you can do “black magic”. Think that using it you can place 3D objects in the scene, by using a third-party framework and the <a class="reference external" href="https://photonstorm.github.io/phaser3-docs/Phaser.GameObjects.Extern.html">Extern game object</a>. Or complex 2D objects modeled by animation tools. Or tile-maps created with a <a class="reference external" href="https://phaser.io">Phaser</a> unsupported format.</p>
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