Mastering videogame secrets in theory and practice

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Comparative Media Studies, 2007.Includes bibliographical references (p. 86-89).Secrets are a ubiquitous part of contemporary videogame design, yet are largely unexplored within academic discourse and often dismissed as extras. I contend that secrets play a fundamental and influential role within a given gamespace in terms of the way they affect a videogame design and player experience. As such this paper will investigate the nature of secrets in videogames. I shall find where secrets exist in a game and how they function as moments of gameplay. Then I will explore secrets historically and look at how the meaning of secrets have changed and evolved over time. It will be shown that secrets create a window to an underlying structure of gameplay, a meta-level that subverts the regular play of a videogame. Further, I will argue that secrets are a space where players engage in unstructured play, free from the constraints of a game design. Finally I will demonstrate how secrets can be used to personalize or redesign the experience of a videogame and/or remake the game design itself. In order to make this argument I will break down what secrets can mean specifically to players through two very differently structured games: The Legend of Zelda: Ocarina of Time and Animal Crossing. Knowing why secrets matter in a gamespace will reveal a reason for why videogames are compelling as a brave new form of media.by Kristina Lynn Drzaic.S.M

Texture and shape of two-dimensional domains of nematic liquid crystal

We present a generalized approach to compute the shape and internal structure of two-dimensional nematic domains. By using conformal mappings, we are able to compute the director field for a given domain shape that we choose from a rich class, which includes drops with large and small aspect ratios, and sharp domain tips as well as smooth ones. Results are assembled in a phase diagram that for given domain size, surface tension, anchoring strength, and elastic constant shows the transitions from a homogeneous to a bipolar director field, from circular to elongated droplets, and from sharp to smooth domain tips. We find a previously unaccounted regime, where the drop is nearly circular, the director field bipolar and the tip rounded. We also find that bicircular director fields, with foci that lie outside the domain, provide a remarkably accurate description of the optimal director field for a large range of values of the various shape parameters.Comment: 12 pages, 10 figure

Mitochondrial variability of Small Međimurje dog

There are six native dog breeds in Croatia recognized by the Federation Cynologique International (FCI) and one national dog breed Small Međimurje dog (MEDI) still unrecognized by the FCI. To promote breed we have analysed mitochondrial DNA control region (CR-mtDNA) sequence (551-bp) in 35 Small Međimurje dogs sampled in Međimurje County. After comparison with 33 worldwide distributed dog breeds (N=115 samples), three main canine CR-mtDNA haplogroups (A, B and C) were observed in Small Međimurje dogs. Median-joining tree showed that MEDI forms six haplotypes presented in haplogroup C (H3 is the most frequent in MEDI population), haplogroup A (haplotypes H2, H5 and H7) and in haplogroup B (haplotypes H4 and H6). The results presented in this study correspond to other mtDNA studies of native dog breeds. For the better genetic description of MEDI and for the optimal future breeding management, further analyses of nuclear genome are recommended

Formation of disclination lines near a free nematic interface

We have studied the nucleation and the physical properties of a -1/2 wedge disclination line near the free surface of a confined nematic liquid crystal. The position of the disclination line has been related to the material parameters (elastic constants, anchoring energy and favored anchoring angle of the molecules at the free surface). The use of a planar model for the structure of the director field (whose predictions have been contrasted to those of a fully three-dimensional model) has allowed us to relate the experimentally observed position of the disclination line to the relevant properties of the liquid crystals. In particular, we have been able to observe the collapse of the disclination line due to a temperature-induced anchoring angle transition, which has allowed us to rule out the presence of a real disclination line near the nematic/isotropic front in directional growth experiments. 61.30.Jf,61.30.G

Mitochondrial variability of Small Međimurje dog

There are six native dog breeds in Croatia recognized by the Federation Cynologique International (FCI) and one national dog breed Small Međimurje dog (MEDI) still unrecognized by the FCI. To promote breed we have analysed mitochondrial DNA control region (CR-mtDNA) sequence (551-bp) in 35 Small Međimurje dogs sampled in Međimurje County. After comparison with 33 worldwide distributed dog breeds (N=115 samples), three main canine CR-mtDNA haplogroups (A, B and C) were observed in Small Međimurje dogs. Median-joining tree showed that MEDI forms six haplotypes presented in haplogroup C (H3 is the most frequent in MEDI population), haplogroup A (haplotypes H2, H5 and H7) and in haplogroup B (haplotypes H4 and H6). The results presented in this study correspond to other mtDNA studies of native dog breeds. For the better genetic description of MEDI and for the optimal future breeding management, further analyses of nuclear genome are recommended

Ordering of droplets and light scattering in polymer dispersed liquid crystal films

We study the effects of droplet ordering in initial optical transmittance through polymer dispersed liquid crystal (PDLC) films prepared in the presence of an electrical field. The experimental data are interpreted by using a theoretical approach to light scattering in PDLC films that explicitly relates optical transmittance and the order parameters characterizing both the orientational structures inside bipolar droplets and orientational distribution of the droplets. The theory relies on the Rayleigh-Gans approximation and uses the Percus-Yevick approximation to take into account the effects due to droplet positional correlations.Comment: revtex4, 18 pages, 8 figure

Parity Breaking in Nematic Tactoids

We theoretically investigate under what conditions the director field in a spindle-shaped nematic droplet or tactoid obtains a twisted, parity-broken structure. By minimizing the sum of the bulk elastic and surface energies, we show that a twisted director field is stable if the twist and bend elastic constants are small enough compared to the splay elastic constant, but only if the droplet volume is larger than some minimum value. We furthermore show that the transition from an untwisted to a twisted director-field structure is a sharp function of the various control parameters. We predict that suspensions of rigid, rod-like particles cannot support droplets with a parity broken structure, whereas they could possibly occur in those of semi-flexible, worm-like particles.Comment: 20 pages, 9 figures, submitted to Journal of Physics: Condensed Matte

Topological Defects and Interactions in Nematic Emulsions

Inverse nematic emulsions in which surfactant-coated water droplets are dispersed in a nematic host fluid have distinctive properties that set them apart from dispersions of two isotropic fluids or of nematic droplets in an isotropic fluid. We present a comprehensive theoretical study of the distortions produced in the nematic host by the dispersed droplets and of solvent mediated dipolar interactions between droplets that lead to their experimentally observed chaining. A single droplet in a nematic host acts like a macroscopic hedgehog defect. Global boundary conditions force the nucleation of compensating topological defects in the nematic host. Using variational techniques, we show that in the lowest energy configuration, a single water droplet draws a single hedgehog out of the nematic host to form a tightly bound dipole. Configurations in which the water droplet is encircled by a disclination ring have higher energy. The droplet-dipole induces distortions in the nematic host that lead to an effective dipole-dipole interaction between droplets and hence to chaining.Comment: 17 double column pages prepared by RevTex, 15 eps figures included in text, 2 gif figures for Fig. 1

Non-isothermal model for the direct isotropic/smectic-A liquid crystalline transition

An extension to a high-order model for the direct isotropic/smectic-A liquid crystalline phase transition was derived to take into account thermal effects including anisotropic thermal diffusion and latent heat of phase-ordering. Multi-scale multi-transport simulations of the non-isothermal model were compared to isothermal simulation, showing that the presented model extension corrects the standard Landau-de Gennes prediction from constant growth to diffusion-limited growth, under shallow quench/undercooling conditions. Non-isothermal simulations, where meta-stable nematic pre-ordering precedes smectic-A growth, were also conducted and novel non-monotonic phase-transformation kinetics observed.Comment: First revision: 20 pages, 7 figure