In this article, we present our development of a virtual reality simulation of sailing on the Hōkūle‘a, a Polynesian double-hulled sailing canoe built in Hawai‘i in 1974, which completed its worldwide journey in 2017. The construction and sailing of this vessel is of significant importance to the Hawaiian cultural renaissance of the 1970s and 1980s; of particular relevance is Hawaiian wayfinding, the cultural practice of navigating across the open ocean to a destination without the use of maps or modern navigation instruments. By developing the simulation, we aimed to assist in the cultural preservation of the star navigation portion of Hawaiian wayfinding techniques, and to help to educate future generations of non-instrument navigators. The first implementation of Kilo Hōkū as a cultural heritage project in virtual reality was to test its viability as a tool for Modern Hawaiian wayfinders to use in classroom instruction, and its realism as an accurate reproduction of the Hōkūle‘a’s sailing experience. The reaction to the simulation from current practicing Modern Hawaiian wayfinders was positive, and indicates that further study is warranted in testing the efficacy of the simulation for teaching Hawaiian wayfinding to future navigators, as well as preserving and spreading knowledge of Hōkūle‘a and of Modern Hawaiian wayfinding beyond Hawai‘i.
Morphogenesis, the shaping of an organism, is a complex biological process accomplished through an well organized interplay between growth, differentiation and cell movement.It is still today one of the major outstanding problems in the biological sciences. Pattern formation has been well-addressed in the literature with the development of many mathematical models including the famous reaction-diffusion ones. We here take a different approach, introducing a controlled cellular automaton in order to model the signal molecules, known as growth factors, that convey information from one cell to another during an organism's development and help maintain the viability of the adult. This control represents extracellular structures that have been associated with the regulation of stem cell proliferation and are called fractones. In this paper we introduce two co-evolving automata, one describing the perturbed diffusion of growth factors and one accounting for the rules of basic cellular functions (proliferation, differentiation, migration and apoptosis). Fractones are introduced as an external input to control the shaping of multi-cellular organisms; we analyze their influence on the emerging shape. We illustrate our theory with 2 and 3 dimensional simulations. This work presents the foundation upon which to develop cellular automata as a tool to simulate the morphodynamics in embryonic development.
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The Destiny-class CyberCANOE (Destiny) is a Hybrid Reality environment that provides 20/20 visual acuity in a 13-foot-wide, 320-degree cylindrical structure comprised of tiled passive stereo-capable organic light emitting diode (OLED) displays. Hybrid Reality systems combine surround-screen virtual reality environments with ultra-high-resolution digital project-rooms. They are intended as collaborative environments that enable multiple users to work minimally encumbered for long periods of time in rooms surrounded by data in the form of visualizations that benefit from being displayed at resolutions matching visual acuity and/or in stereoscopic 3D. Destiny is unique in that it is the first Hybrid Reality system to use OLED displays and it uses a real-time GPU-based approach for minimizing stereoscopic crosstalk. This paper chronicles the non-trivial engineering research and attention-to-detail that is required to develop a production quality hybrid-reality environment by providing details about Destiny’s design and construction process. This detailed account of how a Hybrid Reality system is designed and constructed from the ground up will help VR researchers and developers understand the engineering complexity of developing such systems. This paper also discusses a GPU-based crosstalk mitigation technique and evaluation, and the use of Microsoft’s augmented reality headset, the HoloLens, as a design and training aid during construction.
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