The first method, which is the method Epic recommends, is to use the LOD Group presets, which automatically creates LODs based on pre-configured settings. There are two different ways in which LODs can be generated. In the following section, we will create a new project that has Starter Content, and then open up a Static Mesh asset to work with.
In the following guide, we'll show you how-to setup and use the automatic LOD generation system in your UE4 projects. It will continue to collapse edges until it reaches the requested target number of triangles. When this happens, the tool will pick the best place to put the newly merged vertex, removing any triangles that have also collapsed along with the edge. It then picks the edge with the least amount of visual impact and collapses it. Quadratic mesh simplification works by calculating the amount of visual difference that collapsing an edge (by merging two vertices) would generate. Automatic LOD generation uses what is called quadratic mesh simplification to help generate the LODs for Static Meshes.
The Automatic LOD generation system allows you to automatically reduce the polygon count of your Static Meshes to create LODs with the Unreal Engine 4 (UE4) Editor.
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