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Item GPU Based On-the-fly Light Emission-absorption Approximation for Direct Multi-volume Rendering(The Eurographics Association, 2011) Khlebnikov, Rostislav; Kainz, Bernhard; Roth, Bernhard; Muehl, Judith; Schmalstieg, Dieter; R. Laramee and I. S. LimWe present a novel on-the-fly scatter approximation scheme that can be applied concurrently to multiple volumetric datasets. We use a simplified version of the emission-absorption model, including single scattering and shadowing and guide the scatter sample positions and in-scatter coefficients by local gradients. This allows us to render multiple intersecting volumes with our rendering system with clearly visible improvements in rendering quality over local illumination models, while maintaining interactive frame-rates.Item Using Visualisation Techniques and Molecular Dynamics to Study Atoms Diffusing in Glass(The Eurographics Association, 2011) Flikkema, E.; Zhou, Z.; Greaves, G. N.; R. Laramee and I. S. LimIn this poster, virtual reality and visualisation techniques are used to interpret the output of Molecular Dynamics simulations. In particular, mixtures of sodium-disilicate and potassium-silicate are studied. In such systems, the silicon and oxygen atoms form a disordered network. The alkali atoms are relatively mobile and will diffuse through channels in the silica network. This behaviour is rationalised by considering the concept of accessible free volume .Item Accelerated 5D Ray Tree construction on the GPU(The Eurographics Association, 2011) Kammaje, Ravi P.; Mora, Benjamin; R. Laramee and I. S. LimRay tracing random rays has been a challenge. Due to their reduced coherence, the normal methods of acceleration like packet tracing that make use of coherence of the rays do not work well. These random rays are encountered in global illumination methods. 5D ray classification, first introduced by Arvo and Kirk [AK87], can classify these rays into coherent groups. We introduce a method that builds a hierarchical structure identifying coherence in random rays very quickly using the increased processing power of the GPU.Item High Performance Interactive Painting On The GPU(The Eurographics Association, 2011) Großer, M.; Wacker, M.; R. Laramee and I. S. LimThis paper addresses the problem of mapping between two different texture coordinate setups for one single mesh. We exploit the advantages of the render pipeline on the GPU to obtain interactive texture painting on an already textured mesh. The approach combines projection mapping with a render-to-texture technique in order to bake additional layers of texture or detail into a given texture. The benefit of our approach is high performance and complete independence of complexity of the object and the parametrization.Item Visualising Semantic Pathways in Document Collections(The Eurographics Association, 2011) Rowland, C.; Anderson, J.; R. Laramee and I. S. LimIn this paper we discuss our investigation of the potential uses of animation and visualisation techniques for exploring unstructured text-based data. We reflect upon a design methodology that is rooted in art and design practice and introduce a conceptual model for following "semantic pathways" through document collections. We also describe an implementation of a working model of an interactive visualisation. We see potential applications for our conceptual model in domains where there is a requirement to infer narrative from multiple sources of evidence such as in counter-terrorism and criminal investigations.Item Procedural Generation of Infinite Cities(The Eurographics Association, 2011) Danihelka, Jiri; Zara, Jiri; R. Laramee and I. S. LimWe present a novel technique for generation of pseudo-random infinite cities in a real-time. The generated cities can have arbitrarily oriented streets and building blocks can be arbitrarily shaped. The shapes of city buildings are determined using a pseudo-random generator that uses building coordinates as the initial generator seed.Item Concept of Skeleton Texture Mapping(The Eurographics Association, 2011) Madaras, Martin; R. Laramee and I. S. LimThis article introduces an idea for novel way of mapping textures onto a surface of 3D model. Our technique is based on two interlocking mappings, the first one maps surface vertices onto computed skeleton and the second maps surrounding area of each skeleton segment into a rectangle with dimensions based on surface properties around this segment. Furthermore, these rectangles are packed into a squared texture by approximately solving an optimization problem which seems to be NP-complete. With our technique, we are able to map the texture onto the surface without any precomputed or stored texture coordinates. Our texture mapping approach is also suitable for surfaces with topology non-homotopic to a sphere.Item Application of Active Appearance Model to Automatic Face Replacement(The Eurographics Association, 2011) Govindaraj, Dinesh; R. Laramee and I. S. LimActive appearance models (AAM) are statistical model for capturing shape as well as appearance of deformable objects like human face. The power of AAM lies in the fact that it can synthesis or explain any given object shape and appearance with compact set of parameters. AAM is used widely in the application of face recognition and facial expression recognition. We present a novel method of using AAM to the application of Face Replacement. Face Replacement is process of replacing the face in an image with any face of our choice while retaining the original pose and expression intact. Face replacement of any two given images takes only few hundreds of milliseconds without compromising quality.Item Four Virtual Reality Simulations for Teaching Earth Sciences(The Eurographics Association, 2011) Aguilar-Sierra, Alejandro; Garduño-López, René; R. Laramee and I. S. LimIn a previous work we proposed a multidisciplinary methodology to produce interactive, virtual reality learning objects to be used in courses for Earth science undergraduate students. In this work we present four recent products from our Visual Laboratory for Earth Sciences at CCA, UNAM. This is a result of the contribution of computer science undergraduate students, computer graphics and visualization specialists and Earth scientists.We are using affordable modern technology, open source libraries and public domain data.Item Synesthetic Sound-Color Cross-Modality in Animations(The Eurographics Association, 2011) Cai, D.; Goto, S.; Wang, J. P.; Asai, N.; Nagata, N.; Fukumoto, A.; Kurumizawa, J.; R. Laramee and I. S. LimCategories and Subject Descriptors (according to ACM CCS): H.5.1 [Information Interfaces And Presentation]: Multimedia Information Systems-Evaluation/methodology