Lookdev artists apply UV maps to 3D models by unwrapping 3D geometry into 2D layouts to accurately map textures, shaders, and materials onto the model’s surfaces.
The 2D UV layout acts as a "guide" for textures (like color, normal, or roughness maps) to align with the model’s shape without stretching—critical for visual realism, such as a character’s skin following facial contours or a prop’s metal texture wrapping seamlessly around edges.
For new lookdev artists, start with simple models (like a cube or sphere) to practice unwrapping and testing texture alignment—this builds intuition for how UVs affect final material work without overwhelming complexity.