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NEW QUESTION # 82
Which file format is optimized for I/O performance in OpenUSD?
- A. .usda
- B. .usdc
Answer: B
Explanation:
(.usdc) is binary and optimized for efficient read/write operations.
NEW QUESTION # 83
What is the best prim type for organizing hierarchies without adding transform semantics?
- A. Xform
- B. Scope
- C. Mesh
- D. Material
Answer: B
Explanation:
Scope prims provide logical grouping without introducing transformations like Xforms.
NEW QUESTION # 84
What is an instance proxy in USD?
- A. A temporary prim created during flattening
- B. A hidden layer containing instance data
- C. A duplicate of the prototype prim stored in memory
- D. A virtual prim representing a descendant beneath an instance
Answer: D
Explanation:
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.
NEW QUESTION # 85
Which of the following is NOT allowed with instance proxies?
- A. Accessing the corresponding prototype prim
- B. Traversing to parent or children prims
- C. Computing transforms (e.g., ComputeLocalToWorldTransform)
- D. Editing attributes or adding new prims
Answer: D
Explanation:
Instance proxies are read-only. You cannot author changes (add/remove/override) through them, but they can be used for queries and computations.
NEW QUESTION # 86
Where do prototype prims exist?
- A. Explicitly written in the .usd scene description
- B. Generated and managed internally by UsdStage
- C. Inside each instance prim definition
- D. Stored in a separate prototype.usd file
Answer: B
Explanation:
Prototype prims do not exist in the .usd file. They are created dynamically by UsdStage and updated automatically as the scene changes.
NEW QUESTION # 87
Regarding --up-axis export option:
- A. Is a transform option; may also apply a corrective rotate op on the defaultPrim for visual continuity
- B. Is unsupported in OpenUSD
- C. Only changes metadata; geometry never needs a corrective transform
- D. Should always run during extraction
Answer: A
Explanation:
Up-axis is best applied in Transform; a corrective rotation keeps the asset visually upright.
NEW QUESTION # 88
Which function is used to make a prim instanceable in Python?
- A. UsdGeom.Xform.SetInstanceable(True)
- B. UsdPrim.SetInstanceable(True)
- C. UsdStage.CreateInstance(
Answer: B
Explanation:
In Python, you can mark a prim as instanceable using prim.SetInstanceable(True). This tells UsdStage that the prim should participate in instancing.
NEW QUESTION # 89
How do you bind a material to a mesh prim?
- A. UsdShade.Material.Apply(prim)
- B. UsdShade.MaterialBindingAPI(prim).Bind(material)
- C. prim.SetMaterial(material
- D. UsdGeom.Bind(material)
Answer: B
Explanation:
Binding API is the canonical mechanism.
NEW QUESTION # 90
Which is a valid transformation opportunity?
- A. Pruning unneeded prims for a target workflow
- B. Rewriting the OBJ spec
- C. Changing USD file extension rules
- D. Editing the Hydra renderer
Answer: A
Explanation:
Transformation can remove irrelevant data for specific clients.
NEW QUESTION # 91
What is the primary role of an inherits arc in USD?
- A. To broadcast uniform changes to many prims with a single override
- B. To enable deferred loading of assets
- C. To compress geometry data
- D. To duplicate assets without path translation
Answer: A
Explanation:
Inherits arcs allow one authored change to propagate across all prims that inherit from the source.
NEW QUESTION # 92
What is the effect of cube.GetSizeAttr().Set(2.0)?
- A. Removes the size attribute
- B. Changes the schema default
- C. Authors the cube's size to 2.0
- D. Creates a new prim
Answer: C
Explanation:
This authors the size attribute of the cube to 2.0.
NEW QUESTION # 93
Which is not a typical benefit of faithful extraction?
- A. Common foundation for later transforms
- B. Easier debugging/legibility
- C. Automatic performance optimization
- D. Simpler round-tripping
Answer: C
Explanation:
Performance tuning is a transform concern, not extraction.
NEW QUESTION # 94
Which API can move multiple prims into /World in one shot?
- A. Sdf.BatchNamespaceEdit
- B. Usd.Stage.ReparentAll()
- C. UsdGeom.MoveAll()
Answer: A
Explanation:
Batch namespace edits support safe repathing/reparenting.
NEW QUESTION # 95
Why use Tf.MakeValidIdentifier for prim/material names?
- A. To guarantee USD-legal identifiers
- B. For compression
- C. To shuffle order
Answer: B
Explanation:
It fixes invalid characters and leading digits.
NEW QUESTION # 96
For round-trip workflows you should:
- A. Prefer minimal, reversible transforms and layering
- B. Always triangulate and merge
- C. Apply heavy destructive transforms early
- D. Bake everything to textures
Answer: A
Explanation:
Minimizing transforms preserves reversibility and fidelity.
NEW QUESTION # 97
What does the NamespaceEditor.ReparentPrim() function do?
- A. Deletes a prim
- B. Moves a prim under a new parent prim
- C. Creates a new layer
- D. Renames a prim
Answer: B
Explanation:
ReparentPrim moves an existing prim under a new parent, updating relationships automatically.
NEW QUESTION # 98
What is returned if you call Get() on a non-existent attribute?
- A. Fallback value
- B. Empty string
- C. Error
- D. None
Answer: C
Explanation:
Attempting to Get() on a non-existent attribute raises an error.
NEW QUESTION # 99
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