Authored opinions are explicit values set by the user with Set().
Question 42
What is a key difference between referencing and sublayering?
Correct Answer: D
The key distinction is the scope of what each composition arc contributes. Sublayering composes the contents of one layer into another layer stack, bringing in the layer's scene description as a whole. It is commonly used to combine broad workstream layers such as modeling, layout, animation, lighting, or shot overrides. Referencing , by contrast, is authored on a prim and brings scene description from an external layer, typically rooted at a selected prim or the referenced layer's default prim. This makes references ideal for asset composition, where a model, prop, environment element, or component is introduced at a specific namespace location. Option D is correct because it precisely captures this namespace behavior: references target and compose a prim hierarchy, while sublayers contribute all layer contents into the layer stack. Option A is incorrect because reference list operations can also be ordered and edited. Option B is misleading because composition strength is governed by USD's LIVERPS ordering and layer-stack strength, not a simple statement that references are always stronger. Option C is incorrect because a prim can have multiple references through list editing. This aligns with Composition # Sublayers, References, Layer Stacks, Namespace Composition, and LIVERPS Strength Ordering .
Question 43
How does an inherits arc differ from directly editing the referenced asset file?
Correct Answer: B
Direct edits ripple everywhere; inherits allow local context-specific changes.
Question 44
What does usdchecker do?
Correct Answer: B
usdchecker enforces structural and interchange rules for robust rendering and sharing.
Question 45
What is an instance proxy in USD?
Correct Answer: C
An instance proxy represents a prim inside an instance, even though it does not actually exist in the scenegraph. It behaves like the prototype's prim but appears under the instance path.
