Parks expects a roof opinion that never contributes in the twin. How can variant selection explain the missing opinion?
Select an answer to reveal the explanation.
Short Explanation
You can find the missing roof opinion by checking whether the active variant selection excludes the layer or composition arc that carries it. Variant selection does not delete every citywide mesh, ignore long variant-set names, or automatically mute the entire LayerStack.
Full Explanation
The roof opinion can be missing because the active variant selection excludes the layer or composition arc that carries it. Variant selection determines which variant opinions and their associated composition content contribute to the composed stage; if the selected variant leaves out the carrying layer or arc, the roof opinion does not compose, even if it is available through another selection. The claim that variants always delete all meshes citywide is incorrect: variant selection is not a rule that removes every mesh across the city. USD does not ignore a variant set merely because its name is longer than eight characters, so name length does not explain the missing opinion. Selecting a variant also does not automatically mute the entire LayerStack; muting is a separate control, not an effect inherent to variant selection. Exam caveat: a roof opinion may also fail to appear for another composition reason, such as a referenced or payloaded asset not loading, but when the question asks how variant selection explains the issue, check whether the selected variant excludes the carrying layer or arc. Practical check: inspect the parks structure’s variant selections and the arcs included by each, then select the one that carries the roof opinion and verify that the roof prims compose on the stage.