Methods and network architecture for modifying extensible virtual environment to support mobility

Optimization Techniques for 3D Graphics Deployment on Mobile Devices

“…The optimization methods in this phase can be categorized into the following approaches: (1) remote caching, where all previously simplified 3D graphics are stored in a remote cache and re-used if similar requests appear [38], (2) traffic shaping, as combining multiple downloadable items into a single bundle will enable sending of larger data blocks instead of smaller ones hence favoring the wireless transmission channel [39], and (3) progressive downloading, in which a low quality version of the 3D graphics are first sent followed by incremental data that increases the visual quality of the 3D graphics [40].…”

“…As earlier mentioned, the capabilities of mobile hardware for 3D graphics re-production grow On-device optimization [8] x [33] x x [34] x [35] x [36] x [37] x [38] x x [39] x [40] x x [41] x [42] x [43] x x [44] x [53] x [54] x x [55] x x [56] x x [57] x x [58] x [60] x [61] x [62] x x [63] x x [64] x x [65] x [66] x [67] x [68] x [69] x [70] x [71] x [72] x [73] x [74] x x [76] x x [77] x [78] x [79] x [80] x [81] x [82] x [83] x [84] x extremely fast. For instance, 3D rendering performance of Tegra4 is roughly three-four times higher when compared to the previous generation [45].…”

“…Also the mobile chipset accounts roughly for one-third of the total energy consumption, and therefore, conducting the majority of the 3D graphics simplifications already in the remote simplification phase can result in huge performance improvements and energy savings in the rendering phase. The component performing the 3D graphics simplifications can be implemented, for instance, in a network proxy [38]. The optimization techniques in the remote simplification phase include creation of LODs, data type transformations and compression.…”

“…The reason is that usually surface materials (i.e., shadows and lighting) have influence on more than one 3D model at a time, and hence the simplification effects may be cumulative [38,85]. In overall, the simplification methods used in the creation of LODs are very efficient, but not perfect.…”

“…These failures can appear as misaligned texture coordinates causing incorrect results in the surface shading, or they can result in incorrect mesh topologies. Vatjus-Anttila et al [38] and Pool et al [85] show visual examples of when the simplification process causes loss of the 3D model integrity. They also emphasize that the creation of LODs for textures may result in the disappearance of important details in the 3D models.…”