1. A method for displaying realistic occlusion between a real object and a virtual object by a head mounted, augmented reality display device system comprising: determining a spatial occlusion relationship exists between an occluding object and an occluded object including the real object and the virtual object based on overlapping three dimensional space (3D) positions of the objects in a 3D mapping of at least a user field of view of the display device system; responsive to identifying the spatial occlusion relationship as a partial spatial occlusion between the real object and the virtual object, retrieving object boundary data of an occluding portion of the occluding object in the partial occlusion; determining a level of detail for a model representing a partial occlusion interface based on level of detail criteria, the partial occlusion interface is the intersection at which object boundary data of an occluding portion of the occluding object is adjacent an unoccluded portion of an occluded object; generating a model of the partial occlusion interface based on the retrieved object boundary data in accordance with the determined level of detail; generating a modified version of boundary data of the virtual object adjacent an unoccluded portion of the real object based on the model, the generated adjacent boundary data having a shape based on the model; and displaying an unoccluded portion of the virtual object in accordance with the modified version of its boundary data.