Simple versus complex collision

In Unreal Engine 4, we will be able to autogenerate collisions for our meshes that can be used in our game. There are two different types of collision that exist in Unreal Engine 4: simple and complex collision. Each type of collision serves its own unique purpose, and in this section, we will simply define each collision type and provide examples of each. Later on in this chapter, we will work on how to apply these collisions to our objects. We will also test these collisions in our game. Let's begin with simple collision.

A simple collision is a collision mesh that uses basic shapes, such as boxes, spheres, capsules, and convex shapes, to define the bounds of our object. Convex shapes are ones that have one or more interior angles that are less than 180 degrees, whereas concave shapes are ones that possess one or more interior angles that are more than 180 degrees, as shown in the following image:

In addition to these basic shapes, we can generate a...