For instance, the fact that one of the cubes is floating above the others is only really noticeable when we have shadows. You can see that with shadows it becomes much more obvious how the objects relate to each other. For example, take a look at the following image of a scene with and without shadows: They give a greater sense of depth to our scene and objects. Shadows add a great deal of realism to a lit scene and make it easier for a viewer to observe spatial relationships between objects. When a light source's light rays do not hit an object because it gets occluded by some other object, the object is in shadow. Shadows are a result of the absence of light due to occlusion. Shadow Mapping Advanced-Lighting/Shadows/Shadow-Mapping
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