There are times where, to get the visual effect we want, we need a complex 3D object. One option is to create our own using the ProBuilder modeling tools built into Unity, which we will explore later in the Creating geometry with ProBuilder recipe. However, another option is to use a 3D model that's been created by a third party. The Unity Asset Store is just one source for models, and they are already prepared for importing into Unity as  FBX models or even Unity Prefabs. However, there are thousands of free 3D models available online that have been made with third-party 3D modeling applications, and all we need to do is open them in their applications and export them as FBX models, ready to be imported into Unity.
In this recipe, we'll convert a free 3D model of some pumpkin Jack-o'lanterns and other items into an .fbx file, which we can then import and use in a Unity project:
