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The property responsible for controlling how light interacts with microsurface details is smoothness. Smoothness affects how light reflects off an object’s surface, especially when considering the finer details that may not be visually apparent. A smoother surface allows for clearer and more defined reflections, resulting in a more polished appearance where light can spread more uniformly across the surface. In contrast, surfaces with less smoothness or increased roughness will scatter light in different directions, leading to a more diffused reflection that does not showcase the fine surface textures as effectively.

This characteristic plays a significant role in how materials appear in a scene, impacting the visual realism of objects in a game. For instance, a highly smooth surface like polished metal would reflect light sharply and clearly due to its minimal microsurface detail, whereas a rough or matte finish would diffuse light, blurring and softening the details. Thus, understanding and manipulating the smoothness property is essential for achieving desired visual outcomes in Unity and other game development environments.