CEIG15

Permanent URI for this collection

https://diglib.eg.org/handle/10.2312/12670

Browse

Browsing CEIG15 by Subject "I.3.7 [Computer Graphics]"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    An Interactive Algorithm for Virtual Patient Positioning
    (The Eurographics Association, 2015) Casafranca, Juan José; Sújar, Aaron; García, Marcos; Mateu Sbert and Jorge Lopez-Moreno
    In the last years, Virtual Reality medical simulators are gaining importance, training new physicians in a safe environment. In order to improve the trainees' skills, these applications let them perform a specific medical procedure in different virtual patients with different anatomical variation. Typically, virtual patients are generated from medical imaging data sets, such as MRI (magnetic resonance imaging), CT (computed tomography) or US (ultra sound). Usually, these data are generally captured in specific subject position. This pose is different from the subjects' position required in the simulated specific medical procedure. This paper proposes a novel technique that allows adapting the virtual patient anatomy to any desired pose. Our algorithm follows a geometrically based approach with the intention of: (i) being independent of a proper mechanical description of the tissues which is rarely available and (ii) keeping our user interface running at interactive rates. We adapted the skeletal animation workflow to deal with internal anatomy models. Most of the stages of this workflow have been automated. The user intervention has been limited to the interactive pose selection process. Additionally, in order to refine the solutions provided by our geometric approach, we have designed an optimization phase to achieve more appealing results.
  • No Thumbnail Available
    Item
    Real-time Inextensible Hair with Volume and Shape
    (The Eurographics Association, 2015) Sánchez-Banderas, Rosa María; Barreiro, Héctor; García-Fernández, Ignacio; Pérez, Mariano; Mateu Sbert and Jorge Lopez-Moreno
    Hair simulation is a common topic extensively studied in computer graphics. One of the many challenges in this field is simulating realistic hair in a real-time environment. In this paper, we propose a unified simulation scheme to consider three of the key features in hair simulation; inextensibility, shape preservation and hair-hair interaction. We use an extension to the Dynamic Follow the Leader (DFTL) method to include shape preservation. Our implementation is also coupled with a Lagrangian approach to address the hair-hair interaction dynamics. A GPU-friendly scheme is proposed that is able to exploit the massive parallelism these devices offer, being able to simulate thousands of strands in real-time. The method has been integrated in a game development platform with a shading model for rendering and several test applications have been developed using this implementation.