https://wccftech.com/call-of-duty-modern-warfare-rt-shadows-performance-will-have-you-keeping-rtx-on/

When Call of Duty Modern Warfare announced that it was going to be featuring RTX Ray Tracing through DXR Ray Traced Shadows I was a bit thrown off as I would have expected something more prominent like the use of Ray Traced Reflections like what Battlefield V pulled off. This isn't the first time we've seen a game use DXR based Ray Traced Shadows as it was introduced in Shadow of the Tomb Raider some time back. The problem was it was a really computationally expensive feature and that worried me a bit with Modern Warfare, but that concern was quickly laid to rest when I started playing on my personal system to get a feel for the game using the Ryzen 9 3900X and GeForce RTX 2080 at 1440p with maximum detail levels and never once saw a hitch.

Call of Duty Modern Warfare is featuring more than one source for shadows. They are using Point Light Shadows and Spot Light Shadows. Point Light Shadows typically come from light bulbs or flames and scatter shadows in all directions, when using traditional shadow maps these can seem really odd and harsh but the Point Light Shadows are able to be cast as objects move around them in a more natural way. Spot Light Shadows, by contrast, are emitted from a cone-shaped light source like a headlight or even a flashlight and this causes the distance of the shadow from the object creating the shadow to either be sharp and well defined at closer distances but softer and more obscure as the shadow falls further from the object.