That being the shooter moves current and known rendering techniques on the assembly line that would be there (selection): Screen-Space Ambient Occlusion, lens flares, depth of field, bloom, motion blur by Gaussian filter, soft shadows, soft particles, refractions , reflections and a dynamic lighting and various Kantenglättungsmodi. Edit this shadow polygon edges (MSAA), alpha-like foliage, respectively shader tests (FXAA) or the entire image (SGSSAA). The latter replaces the "pixel ratio" of HD parts, but says the same thing: supersampling improves the appearance and makes clear from Serious Sam 3 is a circular thing. On top of the pack "triple" or various downsampling filter like Lanczos.