Consider a USD that has a root Xform, that has a child Sphere, that in...

The issue is caused by an invalid scenegraph structure: a Cube gprim is nested below a Sphere gprim. OpenUSD considers nesting gprims under other gprims invalid, and usdchecker warns on this construct because important USD features such as activation and visibility are hierarchical and pruning. The OpenUSD glossary states that when an ancestor gprim is deactivated or made invisible, there should be no way for a descendant gprim to remain active or visible. ( openusd.org )

Option B is correct because the authored hierarchy violates the expected gprim organization. The correct structure is to place geometry prims under transform or organizational prims, such as Xform or Scope, rather than directly under other gprims. Option A is incorrect because USD visibility is not purely explicit per prim. NVIDIA’s Omniverse visibility guide states that setting a prim’s visibility to invisible makes the prim and all children invisible. ( docs.omniverse.nvidia.com ) Option C is also incorrect because setting the Sphere invisible should hierarchically affect descendants in a valid hierarchy. This aligns with Visualization → Visibility, Imageable Prims, Gprim Structure, and Valid Scenegraph Organization .