Abstract: Collaborative environments can allow multiple users access to view and modify objects. In order to avoid conflicting requests from different users to modify objects in the environment, virtual semaphore objects can be made available to users in a collaborative environment. A virtual semaphore can confer an ability to edit or modify objects in the environment, upon being assigned to a user. Users can request changes to user-semaphore assignments, including summoning a semaphore to be self-assigned, surrendering a self-assigned semaphore, transferring a semaphore from one user to another, and scheduling a semaphore assignment to a particular user at a future time. Upon assignment to a particular user, a virtual semaphore can be moved to a location close to a virtual representation of the particular user. Users can request changes to user-semaphore assignments using input devices by making selections in a graphical user interface, or by performing gestures associated with virtual semaphores.

Abstract: Various implementations disclosed herein include devices, systems, and methods for using markers to inform the creation of graphical objects that represent objects. In some implementations, a method includes obtaining an image comprising a two-dimensional (2D) representation of an object. A request is obtained to utilize the image to generate a three-dimensional (3D) object that represents the object. The method includes determining whether the object is associated with a marker indicating reproducible aspect(s) of the object.