A computer-implemented method in conjunction with mixed reality gear (e.g., a headset) includes imaging a real scene encompassing a user wearing a mixed reality output apparatus. The method includes determining data describing a real context of the real scene, based on the imaging; for example, identifying or classifying objects, lighting, sound or persons in the scene. The method includes selecting a set of content including content enabling rendering of at least one virtual object from a content library, based on the data describing a real context, using various selection algorithms. The method includes rendering the virtual object in the mixed reality session by the mixed reality output apparatus, optionally based on the data describing a real context (“context parameters”). An apparatus is configured to perform the method using hardware, firmware, and/or software.