References

These files reference (references = ...) stages from different locations on disk. If loaded successfully, a single cube is visible.

screenshot usdrecord 22.08

file in child folder: reference_child_folder.usda
invalid file: reference_invalid.usda
file in parent folder: reference_parent_folder.usda
file in same folder: reference_same_folder.usda

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reference_invalid.usda

#usda 1.0
(
    customLayerData = {
        string copyright = "Copyright 2022 Apple Inc. All rights reserved."
    }
    upAxis = "Y"
    metersPerUnit = 0.01
    defaultPrim = "World"
)

def "World"
{
    def "invalid_reference" (
        references = @file_does_not_exist.usda@
    )
    {
    }

    def Cube "cube"
    {
    }
}