int usd_isiprimvar(<stage>stage, string primpath, string name)
This function checks whether the primitive or its ancestor has a primvar of the given name.
When running in the context of a node (such as a wrangle LOP), this argument can be an integer representing the input number (starting at 0) to read the stage from. The integer is equivalent to the string form referencing a particular input, e.g., “opinput:0”.
You can also use this argument to refer to a USD file (e.g., “/path/to/file.usd”), or to another LOP node’s cooked stage using the
op: as the path prefix (e.g., “op:/stage/lop_node”).
The path to the primitive.
Primvar name (without namespace).
1 if the primvar exists directly on the given primitive or on its ancestor, or
// Check if the sphere primitive or its ancestor has a primvar "some_primvar". int is_primvar = usd_isiprimvar(0, "/geometry/sphere", "some_primvar");