If you want your scene to have a more realistic look, you can create shadows that appear to be cast by the objects in your scene. Shadows can make all the difference in a scene: a lack of them can create a sterile environment, whereas the right amount can make the same scene delightfully moody.
Shadows are controlled independently for each light source. This means that a scene can have some lights casting shadows and others not.
To create a shadow, you must set up three things: a light that generates shadows; objects that cast and receive shadows; and rendering options that render shadows.
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