What do you add to the composition to create shadows in Adobe After Effects?

Adding lights to the composition allows you to create shadows in Adobe After Effects because light sources interact with 3D layers in the scene. When a light is applied, it casts shadows based on the positioning and intensity of the light source, as well as the properties of the 3D layers. This interaction can create a realistic sense of depth and dimension within your composition.

Furthermore, After Effects provides various light types such as point, spot, and parallel lights, each producing different shadow effects based on their placement and attributes. To utilize shadows effectively, it's essential for layers to be set as 3D layers, which will enable the shadow-casting feature to work correctly in harmony with the light sources added.

In contrast, adjusting contrast settings or adding texture layers does not directly create shadows. While these methods can enhance visual quality or simulate depth, they do not produce the dynamic shadow effects achievable through the precise placement of light sources. Applying shadow effects will add a shadow appearance but lacks the complexity and realism that comes from lighting interactions in a 3D space.