A computer-implemented process for creating a playable scene with an authoring system, the process comprising the steps of: - displaying (100, 110, 120) a three-dimensional authoring scene that is a three-dimensional space wherein an author gathers and optionally configures three dimensional modeled objects that will be part of the playable scene, a three dimensional modelled object being a collection of points in three-dimensional space, connected by various geometric entities such as triangles, lines, curved surfaces the three-dimensional authoring scene comprising representations of instantiated three dimensional modeled objects displayed thereon, wherein one of the representations of an instantiated object represents a three-dimensional experience scene, the three-dimensional experience scene is an object of the authoring scene and is a three-dimensional space wherein the author creates the playable scene and the end-user is allowed to play a playable scene, the representation of the three-dimensional experience scene is displayed in the three-dimensional authoring scene via a portal effect which is created in the three-dimensional authoring scene and the perspective of what is displayed inside the portal changes according to a camera viewpoint outside the portal window; - displacing, upon user action, some of the representations of instantiated three dimensional modeled objects displayed in the authoring scene to the experience scene; - organizing, upon user action, the displaced representations of instantiated three dimensional modeled objects in the experience scene for creating the playable scene, the organization of the displaced representations comprising their location in the 3D experience scene. - displaying (100, 110, 120) a three-dimensional authoring scene that is a three-dimensional space wherein an author gathers and optionally configures three dimensional modeled objects that will be part of the playable scene, a three dimensional modelled object being a collection of points in three-dimensional space, connected by various geometric entities such as triangles, lines, curved surfaces the three-dimensional authoring scene comprising representations of instantiated three dimensional modeled objects displayed thereon, wherein one of the representations of an instantiated object represents a three-dimensional experience scene, the three-dimensional experience scene is an object of the authoring scene and is a three-dimensional space wherein the author creates the playable scene and the end-user is allowed to play a playable scene, the representation of the three-dimensional experience scene is displayed in the three-dimensional authoring scene via a portal effect which is created in the three-dimensional authoring scene and the perspective of what is displayed inside the portal changes according to a camera viewpoint outside the portal window; - displacing, upon user action, some of the representations of instantiated three dimensional modeled objects displayed in the authoring scene to the experience scene; - organizing, upon user action, the displaced representations of instantiated three dimensional modeled objects in the experience scene for creating the playable scene, the organization of the displaced representations comprising their location in the 3D experience scene.