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NEW QUESTION # 124
Where do prototype prims exist?
- A. Stored in a separate prototype.usd file
- B. Generated and managed internally by UsdStage
- C. Explicitly written in the .usd scene description
- D. Inside each instance prim definition
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 # 125
Which Python API is used to add a reference to a prim?
- A. prim.CreateReference()
- B. prim.AppendVariant()
- C. prim.GetReferences().AddReference()
- D. prim.AddPayload()
Answer: C
Explanation:
GetReferences().AddReference() is the standard Python API to add a reference to a prim.
NEW QUESTION # 126
What is the benefit of using geometric and shading variant sets separately?
- A. It forces encapsulation automatically
- B. It eliminates the need for payloads
- C. It changes the default prim
- D. Independent control allows flexible combinations of geometry and materials
Answer: D
Explanation:
Separate sets let geometry and shading be controlled independently for more flexibility.
NEW QUESTION # 127
What type does stage.Traverse() return?
- A. A list of strings
- B. A dictionary of prims
- C. Usd.Stage object
- D. A Usd.PrimRange iterator
Answer: D
Explanation:
stage.Traverse() returns a Usd.PrimRange which acts as an iterator over all prims in the stage.
NEW QUESTION # 128
In USD, OBJ faces map to:
- A. primvars:st
- B. extent
- C. points only
- D. faceVertexIndices + faceVertexCounts
Answer: D
Explanation:
USD stores flattened indices with per-face vertex counts.
NEW QUESTION # 129
Why set a defaultPrim?
- A. To pack into USDZ
- B. To enable time sampling
- C. To enable subdivision
- D. To reference a stage without specifying a target prim
Answer: D
Explanation:
defaultPrim lets external references target the stage without explicit prim paths.
NEW QUESTION # 130
What command saves changes made to a USD stage?
- A. stage.Commit()
- B. stage.Write()
- C. stage.Save()
- D. stage.Store()
Answer: C
Explanation:
stage.Save() persists changes to disk.
NEW QUESTION # 131
Why is it useful to separate shading and geometry into different workstreams even for a single artist?
- A. Because shading layers cannot be referenced
- B. Because materials are always heavier than geometry
- C. Because different DCC tools might be used for each
- D. Because USD forbids combining them
Answer: C
Explanation:
Even a single user might use different DCC tools for modeling and surfacing, so separating them simplifies integration.
NEW QUESTION # 132
Normals interpolation guidance:
- A. Interpolation doesn't matter
- B. Always vertex
- C. Choose vertex if one normal per point; faceVarying if per face-vertex
- D. Always faceVarying
Answer: C
Explanation:
Match interpolation to the data's granularity.
NEW QUESTION # 133
Which of the following best describes the benefit of the instanced Library example compared to the uninstanced version?
- A. The scenegraph hierarchy is smaller, reducing load time and memory usage
- B. Each Book prim contains its own unique geometry data
- C. Instances can override properties inside the prototype independently
- D. UsdStage saves a new .usda file for each prototype prim
Answer: A
Explanation:
By sharing a single prototype prim, the instanced version avoids duplicating the Book hierarchy for each instance. This reduces both scene size and computation overhead.
NEW QUESTION # 134
Which metadata defines the default entry point in an asset?
- A. rootPrim
- B. primaryPrim
- C. entryPrim
- D. defaultPrim
Answer: D
Explanation:
The defaultPrim metadata tells OpenUSD which prim should be used as the main entry point.
NEW QUESTION # 135
What is the main purpose of a variant set in USD?
- A. To generate default prims
- B. To compress geometry data
- C. To automatically create payloads
- D. To define multiple variations of an asset or scene element within a single USD file
Answer: B
Explanation:
Variant sets allow authors to provide multiple alternative configurations for the same prim.
NEW QUESTION # 136
Why is timeSamples considered good for interchange?
- A. It ensures reproducibility of baked animations
- B. It uses binary encoding
- C. It automatically compresses USD files
- D. It links to external data
Answer: A
Explanation:
TimeSamples provide baked, linear animation data that is reproducible across tools.
NEW QUESTION # 137
What is the role of SetStartTimeCode() and SetEndTimeCode() in a USD stage?
- A. To control rendering resolution
- B. To specify the animation timeline range
- C. To define object material properties
- D. To attach metadata to the stage
Answer: B
Explanation:
These methods define the start and end frames of the animation timeline.
NEW QUESTION # 138
What is the role of a prototype prim?
- A. It stores time samples for all instances
- B. It serves as the root of the shared scenegraph for instances
- C. It duplicates geometry for each instance
- D. It manages materials for each instance
Answer: B
Explanation:
It serves as the root of the shared scenegraph for instances
NEW QUESTION # 139
Which method sets object scaling over time?
- A. SetScale()
- B. SetTimeCode()
- C. SetExtent()
- D. SetRotate()
Answer: A
Explanation:
SetScale() applies scale transformations with optional time parameters.
NEW QUESTION # 140
What is the main purpose of using model kinds in OpenUSD?
- A. To replace shading networks
- B. To compress file sizes
- C. To categorize and organize scene elements hierarchically
- D. To increase the rendering frame rate
Answer: C
Explanation:
Model kinds are metadata used to logically organize and categorize scene elements.
NEW QUESTION # 141
When sublayerB is listed before sublayerA, which opinions are stronger?
- A. Both equal
- B. sublayerA
- C. sublayerB
Answer: C
Explanation:
Earlier sublayers in the list always provide stronger opinions.
NEW QUESTION # 142
What does unloading a payload in usdview demonstrate?
- A. Primvars no longer exist in the file
- B. Materials are permanently deleted
- C. Variant sets stop working
- D. Descendant prims disappear until reloaded
Answer: D
Explanation:
Unloading a payload hides its descendant prims from the scene graph until it is reloaded.
NEW QUESTION # 143
How is opinion strength determined between sublayers?
- A. Randomly at runtime
- B. By their order in the subLayerPaths list
- C. File size order
- D. Alphabetically
Answer: B
Explanation:
Sublayers earlier in the list are stronger than those that appear later.
NEW QUESTION # 144
What role does the default prim play in an encapsulated asset when referenced?
- A. It converts all references to payloads
- B. It forces all sublayers to unload
- C. It disables variant sets by default
- D. It serves as the entry point that gets grafted
Answer: D
Explanation:
The default prim is the root prim grafted when the file is referenced or payloaded.
NEW QUESTION # 145
After switching upAxis Y→Z, why add xformOp:rotateX on /World?
- A. To pack USDZ
- B. To recompute normals
- C. To preserve visual "upright" orientation
- D. To reduce file size
Answer: C
Explanation:
Metadata doesn't rotate geometry; a corrective transform keeps the look.
NEW QUESTION # 146
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