Navigate to the installation folder of Unreal Engine 4. If you don't want to constantly navigate inside the Engine folder and would rather have this Skeletal Mesh copied into your project follow these steps. Left-click and drag this Skeletal Mesh into your map. Navigate inside the Engine folder to 'Engine > Content > Tutorial > SubEditors > TutorialAssets > Character > TutorialTPP.uasset':

Inside the Content Browser, click on 'View Options' and enable 'Show Engine Content': To use this Skeletal Mesh, launch the level editor and any of your projects. You will find this Skeletal Mesh Reference inside Engine folder, within the installation directory of UE4. This is the option I use Option #2: Orange Dude Better yet, you will learn how to always have this scale reference with any project. In this tutorial I will show you two ways you can use Skeletal Mesh Reference that is included with Unreal Engine 4. You would then place this mesh around the level, ensuring that your environment is being built to correct proportion. You can judge scale a lot better with anatomical features as part of the mesh than a simple box. The best option is to use a character/skeletal mesh. Primitive shape human model (Static Mesh character made up from simple geometric shapes).The character scale reference must have the same dimensions as the player in-game. This will help to create your level to proper scale and proportion. The first thing you should do when creating a game environment is place a character reference.

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