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| Section | Weight | Objectives |
|---|---|---|
| Data Modeling | - Built-in schemas and data organization - Prims, properties, primvars, time samples - USD and Sdf data structures | |
| Composition | 23% | - Composition arcs (LIVERPS) - References, payloads, sublayers, variants - Composition strategies and debugging |
| Pipeline Development | - Workflow design and implementation - Collaborative pipeline setup - Version control integration | |
| Visualization | - UsdGeom, UsdShade, UsdLux domains - Rendering and display workflows - Geometry, materials, cameras, lights | |
| Content Aggregation | - Instancing and scene assembly - Asset overriding and reuse - Modular asset building | |
| Customizing USD | 6% | - Plugin development - Custom schemas - File format extensions |
| Debugging and Troubleshooting | - Stage introspection - Composition error resolution - Performance and data quality optimization | |
| Data Exchange | - Data translation and conversion - Interoperability between tools - Import/export workflows |
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31. Frage
What does prim.HasAuthoredChildren() check?
Antwort: A
Begründung:
It checks if child prims were explicitly authored.
32. Frage
In OpenUSD, which USDA snippet correctly uses a payload to reference an external asset while allowing deferred loading?
Antwort: B
Begründung:
Option A is the correct USDA pattern because a payload is authored as prim metadata using the singular payload keyword with a list-editing operation such as prepend. NVIDIA's Learn OpenUSD payload exercise shows the canonical USDA form: prepend payload = @./red_cube.usd@, authored on the prim declaration. It further explains that payloads are similar to references in USDA, with the important distinction that the keyword is payload rather than references.
The key technical purpose of a payload is deferred loading. NVIDIA explains that payloads can compose scene description when loaded, or unload the targeted scene description beneath the payloaded prim. It also contrasts this with references, which are always composed and present on the stage, while payloads can be opened unloaded and selectively loaded later.
Option B is incorrect because payloads is not the USDA keyword and it is not authored as a property inside the prim body. Option C uses a reference, not a payload, so it does not provide payload load/unload behavior.
Option D is not the canonical list-op form expected here. This aligns with Composition # References and Payloads # Working With Payloads .
33. Frage
Which transformation order is most commonly used?
Antwort: B
Begründung:
Translate → Rotate → Scale (T→R→S) is the typical transformation order.
34. Frage
You are setting up an outdoor scene with realistic lighting and want to simulate the effect of the sun. Which UsdLux light type is most appropriate for this purpose, providing a directional light source with parallel rays?
Antwort: A
Begründung:
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 .
35. Frage
What does the "Unload" operation in usdview confirm about payloads?
Antwort: C
Begründung:
Unloading shows that payloads can be temporarily removed from memory and reloaded, confirming their non-destructive nature.
36. Frage
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