You are setting up an outdoor scene with realistic lighting and want to simulate the...

The correct UsdLux light type is DistantLight . NVIDIA’s Learn OpenUSD lighting guide identifies UsdLux.DistantLight as a schema where light is emitted from a distant source along the negative Z axis, commonly known as a directional light. This makes it the most appropriate light type for representing sunlight in an outdoor scene.

Option C is correct because sunlight is effectively modeled as coming from an extremely distant source, so its rays are treated as broadly parallel across the scene. The OpenUSD DistantLight schema documentation explicitly describes it as typically used for distant, broad light sources like sunlight, where rays affect the entire scene and are roughly parallel. It also notes that the inputs:angle attribute controls angular diameter; the fallback value approximates the Sun’s apparent angular size from Earth.

Option A , RectLight, is better suited for rectangular area emitters such as panels or windows. Option B , DomeLight, is commonly used for environment or HDRI lighting. Option D , SphereLight, represents local emission from a spherical source, such as a bulb. This aligns with Visualization → UsdLux, Lighting Schemas, DistantLight, Directional Lighting, and Outdoor Illumination .