https://developers.meta.com/horizon/reference/unity/v65/class_oculus_interaction_optional_attribute/
OptionalAttribute Class | Unity: Core SDK v65 | Meta Horizon OS Developers
core sdkmeta horizonclassunityos
https://learn.microsoft.com/it-it/dotnet/api/system.runtime.interopservices.optionalattribute?view=netframework-4.8.1
OptionalAttribute Class (System.Runtime.InteropServices) | Microsoft Learn
Indicates that a parameter is optional.
class systemruntimemicrosoftlearn