19 documents found, page 1 of 2
Infrared tracking system for immersive virtual environments
Gaspar, F.; Dias, M. S.; Bastos, R.In this paper, we describe the theoretical foundations and engineering approach of an infrared-optical tracking system specially design for large scale immersive virtual environments (VE) or augmented reality (AR) settings. The system described is capable of tracking independent retro-reflective markers arranged in a 3D structure (ar-tefact) in real time (25Hz), recovering all possible 6 Degrees of Freedom (DOF...
Sistema de realidade aumentada para apoio ao projeto de arquitetura
Lopes, M.; Silva, J.; Dias, M. S.; Eloy, S.; Gaspar, F.; Miguel, R.; Mendonça, N.Em arquitetura, a maquete, seja para estudo ou para a comunicação da proposta de projeto, desempenha um papel fundamental como ferramenta nos processos criativos de planeamento e conceção de projetos. No entanto, existem por vezes dificuldades associadas a esta abordagem, como o sejam, o tempo gasto e os custos envolvidos na sua produção e modificação, sempre que é necessário prever o resultado de mudanças no p...
The Use of Polypropylene and High-Density Polyethylene on Cork Plastic Composit...
Brites, Fernando; Malça, Cândida; Gaspar, F.; Horta, J. F.; Franco, M. C.; Biscaia, S.; Mateus, A.This work focuses on studying the possibility of 3D printing of composite materials composed by cork and a polymer matrix (CPC). Initially the cork was mixed with two types of polymers (HDPE and PP) in different proportions and later processed using extrusion and injection. The composites were tested to study the physical, chemical and mechanical properties. The material was then tested on a large-scale 3D prin...
Cork Plastic Composite Optimization for 3D Printing Applications
Brites, F.; Malça, C.; Gaspar, F.; Horta, J. F.; Franco, M. C.; Biscaia, S.; Mateus, A.Among natural fillers, cork has been acknowledged as a suitable alternative of other cellular materials that are widely employed in engineering applications due to their low conductivity to heat, noise and vibration, high abrasion resistance and flexibility, high compressibility ratio, among other characteristics [1]. The eco-friendly features of natural fillers based composites make them a very promising and s...
Evaluation of glue line shear strength of laminated timber structures using blo...
Gaspar, F.; Cruz, H.; Gomes, A.Monitoring and evaluation of glued laminated timber structures in service is essential to warrant its integrity, where non-destructive techniques play an important role. This paper describes the results obtained on glued laminated timber beams of maritime pine, with and without preservative treatment, and of spruce, exposed to natural outdoor environment as well as to artificial weathering. The assessment of gl...
SHREC'16 track: Shape retrieval of low-cost RGB-D captures
Pascoal, P. B.; Proença, P.; Gaspar, F.; Dias, M. S.; Ferreira, A.; Tatsuma, A.; Aono, M.; Logoglu, K. B.; Kalkan, S.; Temizel, A.; Li, B.; Johan, H.RGB-D cameras allow to capture digital representations of objects in an easy and inexpensive way. Such technology enables ordinary users to capture everyday object into digital 3D representations. In this context, we present a track for the Shape Retrieval Contest, which focus on objects digitized using the latest version of Microsoft Kinect, namely, Kinect One. The proposed, track encompasses a dataset of two ...
ARch4maps: A mobile augmented reality tool to enrich paper maps
Gaspar, F.; Gomes, S.; Resende, R.; Eloy, S.; Dias, M. S.; Lopes, M.; Faria, N.This paper describes an augmented reality app running on a Windows tablet that recognizes image features on a city paper map and overlays, in real-time, digital content related to the relevant buildings of the city. The system register in 3D the location of those buildings in the map, enriching the user experience with several multimedia information per building: image, text and 3D models which can be explored ...
SHREC’15 Track: Retrieval of Oobjects captured with kinect one camera
Proença, P.; Gaspar, F.; Dias, J.Low-cost RGB-D sensing technology, such as the Microsoft Kinect, is gaining acceptance in the scientific community and even entering into our homes. This technology enables ordinary users to capture everyday object into digital 3D representations. Considering the image retrieval context, whereas the ability to digitalize photos led to a rapid increase of large collections of images, which in turn raised the nee...
Multimodal interaction with BIM data in immersive virtual reality
Alves, L.; Eloy, S.; Dias, J.; Costa, T.; Gaspar, F.In this paper, we combine the potential brought by BIM standards to AEC processes, with the recent trends and results taken from human-computer interaction (HCI). As a result, our system supports the visualization and interaction with 3D BIM models of buildings, at full scale in an immersive virtual reality (VR) environment, using natural and multimodal HCI, namely, combining gesture with speech. We´ve carried ...
Modeling the influence of delamination on the mechanical performance of straigh...
Gaspar, F.; Cruz, H.; Gomes, A.Delamination at the glue lines is a key factor to take into account when assessing glued laminated timber members in service. In order to gain a more objective and wide knowledge about the importance of delamination in relation to its type and extension, a numerical study was developed. Finite element modeling (FEM) was used to evaluate the influence of delamination – near the surface, on the vertical faces and...