Dynamic Muzzle Shadows is a mod for the popular game Fallout 4. It allows you to create real-time shadow effects for your characters and weapons to give them a more immersive, lifelike look.

The effect is created by taking the light from the sun and the explosions and guns you're shooting at and calculating the time it'll take for the light to reach your character. It then uses that information to create the effect.

The result is a more realistic-looking character that looks as if they're in the real world. The shadows look real, and they're created with the same camera and lighting as the rest of the game.