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NEW QUESTION # 19
If you call stage.GetPrimAtPath("/Library/Book_1/Cover"), and Book_1 is an instance(๏ผ/Library/Book_1/Cover๏ผ.
What is returned?
Answer: A
Explanation:
When you access a descendant of an instance, USD returns an instance proxy prim if that prim exists in the prototype.
NEW QUESTION # 20
Why is separating geometry.usd and shading.usd useful?
Answer: D
Explanation:
Separation allows different teams (modelers, surfacing artists) to work independently without blocking each other.
NEW QUESTION # 21
You are debugging a complex scene composed of multiple layers. You notice that a property on a prim has an unexpected value. To understand where this value is coming from, you need to inspect the composition arcs affecting this prim. Which API would be most helpful in visualizing and analyzing the composition arcs for a specific prim?
Answer: C
Explanation:
Usd.Property.GetPropertyStack() is the most appropriate choice because the debugging goal is to determine where a composed property value is coming from. In USD, a final property value can be affected by multiple authored opinions across sublayers, references, payloads, variants, inherits, specializes, and local overrides.
NVIDIA's Learn OpenUSD glossary defines a property stack as the ordered list of property specs that contribute values or metadata for a composed property, and notes that UsdProperty::GetPropertyStack() is specifically useful for debugging, not as the primary value-resolution mechanism. It also explains that USD resolves values by traversing composition information in strength order.
Option C is therefore correct because it exposes the contributing property specs and their layer origins, helping identify why a stronger opinion produced an unexpected result. Option A only traverses prims on the composed stage and does not explain value provenance. Option B reports aggregate stage statistics, not composition-source details. Option D exports the stage or layer contents but does not provide targeted diagnostic ordering for a property. This aligns with Debugging and Troubleshooting # Value Resolution, Property Stack, Composition Debugging, and Layer Opinion Inspection .
NEW QUESTION # 22
When developing a custom USD schema, what statements are true regarding API schemas versus typed schemas? Choose two.
Answer: A,C
Explanation:
API schemas and typed schemas serve different modeling roles in OpenUSD. NVIDIA's Learn OpenUSD schema guidance states that IsA, or typed, schemas define what a prim fundamentally is by assigning a typeName, while API schemas define what capabilities a prim has by adding optional properties or behaviors to an already-typed prim. API schemas do not assign a typeName; instead, they are list-edited through the apiSchemas metadata and queried with HasAPI. ( docs.nvidia.com ) Option A is correct because API schemas can be applied across different prim types, while a typed schema defines a specific prim type such as Mesh, Camera, or Xform. Option B is also correct because one prim has a single typed schema identity, but multiple API schemas can be applied to enrich that prim with additional behaviors. NVIDIA further notes that API schemas may be single-apply or multiple-apply, where multiple- apply schemas can be applied more than once to the same prim using different instance names. ( docs.nvidia.
com )
Option C is incorrect because API schemas can define attributes and relationships. Option D is incorrect because Python binding policy is not the distinguishing factor between API and typed schemas. This aligns with Customizing USD # Schemas, IsA Schemas, API Schemas, typeName, apiSchemas Metadata .
NEW QUESTION # 23
What is the fundamental data type in USD that enables API schemas to be non-destructively removed in stronger layers?
Answer: B
Explanation:
The correct answer is list ops . API schemas are not encoded as a simple boolean flag on a prim. Instead, applied API schemas are stored in the apiSchemas metadata as token-valued listOp data. OpenUSD's UsdPrim::ApplyAPI() documentation states that applying an API schema stores the schema name by adding it to the token-valued listOp metadata apiSchemas. Its RemoveAPI() documentation states that removing an API schema authors an explicit deletion of that schema name from the same listOp metadata.
This is what enables non-destructive removal in stronger layers. A weaker layer may apply an API schema, while a stronger layer can delete that schema token from the composed list without modifying the weaker source layer. NVIDIA's OpenUSD glossary describes list editing as sparse ordered-list composition using operations such as prepend, append, delete, and explicit replacement, allowing stronger layers to modify lists contributed by weaker layers.
Option B is incorrect because arrays store values but do not provide list-edit composition semantics. Option C is incorrect because booleans cannot represent ordered additive and subtractive composition. This aligns with Customizing USD # API Schemas, apiSchemas Metadata, List Editing, and Non-Destructive Layering .
NEW QUESTION # 24
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