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Item Chemical Education using Feelable Molecules(The Eurographics Association, 2009) Davies, R. Andrew; Maskery, James S.; John, Nigel W.; Dieter W. Fellner and Alexei Sourin and Johannes Behr and Krzysztof WalczakTwo different approaches for the preparation of novel cost-effective molecular haptic applications (Figure 1) are described. The former utilises Perl scripting within a commercial molecular modelling package to generate static / animated H3D scene graphs for haptic CPK space-filling atomic perception. Within the second approach, key chemical concepts such as reactivity, aciditity and periodicity can be investigated using prototype H3D user interfaces.Item ImaGINe-S: Imaging Guided Interventional Needle Simulation(The Eurographics Association, 2009) Bello, Fernando; Bulpitt, Andrew; Gould, Derek A.; Holbrey, Richard; Hunt, Carrie; How, Thien; John, Nigel W.; Johnson, Sheena; Phillips, Roger; Sinha, Amrita; Vidal, Franck; Villard, Pierre-Frédéric; Woolnough, Helen; Zhang, Yan; K. Bühler and D. BartzWe present an integrated system for training visceral needle puncture procedures. Our aim is to provide a cost effective and validated training tool that uses actual patient data to enable interventional radiology trainees to learn how to carry out image-guided needle puncture. The input data required is a computed tomography scan of the patient that is used to create the patient specific models. Force measurements have been made on real tissue and the resulting data is incorporated into the simulator. Respiration and soft tissue deformations are also carried out to further improve the fidelity of the simulator.Item Touching The Invisible - Molecular Haptics(The Eurographics Association, 2009) Davies, R. Andrew; Maskery, James S.; John, Nigel W.; Wen Tang and John CollomosseNovel, simple, cost-effective applications combining haptics and computer graphics for the study of key chemical concepts such as reactivity and periodicity at AS/A-level and undergraduate level are described.Item Integration of Haptics with Web3D using the SAI(The Eurographics Association, 2009) Kurmos, Liam; John, Nigel W.; Roberts, Jonathan C.; Dieter W. Fellner and Alexei Sourin and Johannes Behr and Krzysztof WalczakHaptics force-feedback technology is fast becoming a consumer product and no longer only found in research laboratories. The emergence of the budget Falcon device (Novint Technologies, Inc., USA) represents a key step in the dissemination of haptics technology as it offers this functionality to home users, in particular to games players. Haptics has the potential to revolutionise the Human Computer Interface if novel and creative software solutions can be found to utilise it. Currently developing for haptics requires low level programming knowledge, which is often a barrier to uptake. This paper looks at how haptics support can be integrated into an X3D authored virtual world using an open source haptics library via the Scene Authoring Interface (SAI). We supply a partial implementation of a Java wrapping to the HAPI open-source haptics library and provide a demonstration of its use within the Xj3D browser through SAI. This work is intended to contribute to a possible future haptics extension of the ISO X3D standard.Item Simulation of X-ray Attenuation on the GPU(The Eurographics Association, 2009) Vidal, Franck; Garnier, Manuel; Freud, Nicolas; Létang, Jean Michel; John, Nigel W.; Wen Tang and John CollomosseIn this paper, we propose to take advantage of computer graphics hardware to achieve an accelerated simulation of X-ray transmission imaging, and we compare results with a fast and robust software-only implementation. The running times of the GPU and CPU implementations are compared in different test cases. The results show that the GPU implementation with full floating point precision is faster by a factor of about 60 to 65 than the CPU implementation, without any significant loss of accuracy. The increase in performance achieved with GPU calculations opens up new perspectives. Notably, it paves the way for physically-realistic simulation of X-ray imaging in interactive time.