Portuguese Meeting on Computer Graphics 2011 - SIACG 2011

Permanent URI for this collection

https://diglib.eg.org/handle/10.2312/2633063

Browse

Browsing Portuguese Meeting on Computer Graphics 2011 - SIACG 2011 by Subject "and systems"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    A Moving Least Squares Method for Implant Model Deformation in Computer Aided Orthopedic Surgery for Fractures of Lower Extremities
    (The Eurographics Association, 2021) Ramírez, Esmitt; Coto, Ernesto; Silva, F. and Gutierrez, D. and Rodríguez, J. and Figueiredo, M.
    Preoperative planning is an essential step before performing any surgical procedure. Computer Aided Orthopedic Surgery (CAOS) systems are extensively used for the planning of surgeries for fractures of lower extremities. These systems are input an X-Ray image and the planning can be digitally overlaid onto the image. The planning includes reassembling the fractured bone and possibly adding implants to reduce the fracture. In many cases, the implant does not fit perfectly in the patient's anatomy and it must be bended to adjust the implant to the bone. This paper presents a new method for the deformation of implants in CAOS systems, based on the Moving Least Squares (MLS) method for 2D images. Several improvements over the original MLS method are introduced to achieve visual results similar to the real procedure and make the deformation process easier and simpler for the surgeon. The improvements are explained in detail and all parameter values are provided. Over 100 clinical surgeries have been already planned successfully using a CAOS system that employs the proposed technique.
  • No Thumbnail Available
    Item
    Procedural Modelling of Destructible Materials
    (The Eurographics Association, 2021) Gestel, J. van; Bidarra, R.; Silva, F. and Gutierrez, D. and Rodríguez, J. and Figueiredo, M.
    Traditional content creation for computer games is a costly process. In particular, current techniques for authoring destructible behaviour are often limited to a single object basis. In this paper, we build on previous research results to develop a novel method for designing reusable destructible behaviour which can be applied in real-time to a variety of objects. To separate the destructible behaviour from particular objects, we introduce the concept of destructible materials: where the material of an object usually defines the way an object looks, a destructible material will determine how it breaks. Destructible materials provide a reusable definition and intuitive way of designing and tweaking destructible behaviour of objects in game development, which can then be applied in real-time.