• 2006
• Smarticles for Sampling and Rendering Implicit Models
  P Jepp, B Wyvill & M Costa-Sousa
  Theory and Practice of Computer Graphics (EGUK), Middlesborough, UKJune 2006, pp39-46
  Awarded Best Paper
  Abstract: Particle systems are a useful way of speeding up the rendering of implicit models and creating effective visualizations of the surface. Surface features, however, can be difficult to see with traditional styles of rendering particles. Therefore particle systems are being developed that use particles to position strokes rather than draw oriented discs or other more traditional particle shapes. Detection of surface features still remains a problem related to the distribution of the particles. In this research a new technique to sample and position strokes for pen-and-ink style rendering of implicit surfaces is presented. Steering and flocking behaviours are employed to direct particles to sample and render in the same pass.
   
• 2005
• Pen-and-Ink for BlobTree Implicit Models
  Kevin Foster, Pauline Jepp, Brian Wyvill, Mario Costa Sousa, Callum Galbraith,
  Eurogrpahics, Dublin, Ireland, August/September 2005.
  Computer Graphics Forum, Vol.24, No.3, pp267-276.
  
  Abstract: New techniques are presented for rendering complex hierarchical skeletal implicit models in several pen-and-ink styles. A particle system is employed to find interesting areas on the surface and perform stroke stylization guided by local shape features. Interesting areas include silhouette strokes and lines following local shape features such as those caused by CSG junctions. Hidden line removal is performed either by applying a surfel technique for rapid prototyping or, more accurately, by using ray tracing. Examples drawn from simple to complex models illustrate the capabilities of our system.
  
  
• Sketch Based Construction and Rendering of Implicit Models
  Brian Wyvill, Kevin Foster, Pauline Jepp, Ryan Schmidt, Mario Costa Sousa, and Joaquim A. Jorge
  Workshop on Computational Aesthetics, Girona, Catalunya, May 2005: pp67-74
  
  Abstract: We present an implicit modeling system as a tool for the creation of a wide range of aesthetic models. Because of their ability to form blends and produce both organic shapes as well as man made objects implicit surfaces are a good medium for artists seeking new ways to express themselves by building models with either direct manipulation or through a procedural interface. Further, we exploit the differential properties of implicit surfaces to explore new techniques for rendering hierarchical, skeletal implicit models in several pen-and-ink styles. This method extracts and stylizes silhouette strokes, lines following local shape features, such as those caused by CSG junctions and abrupt blends, and short interior marks to reveal basic form. Our approach uses a particle system as a base for the stroke extraction.
  
   
• 2002
• Implicit Modelling with Skeleton Curves: Controlled Blending in Contact Situation
  Alexis Angelidis, Pauline Jepp, Marie-Paule Cani
  Shape Modeling International, Banff, Canada, May 2002: pp137-144
  
  Abstract: Interactive implicit modelling with complex skeletons was recently improved with the introduction of primitives defined at different LODs. These implicit primitives use a subdivision curve as a skeleton. In this paper an extension to this representation is presented, in order to make it suitable for the interactive modeling and animation of soft objects in contact situations. The first contribution improves the display method for subdivision-based implicit primitives; this uses an adaptive polygonisation which locally refines, where necessary, according to the currently selected LOD. The second contribution consists of a new method for preventing unwanted blending when a skeleton-curve folds back onto itself. The third introduces local deformations where surfaces that should not blend come into contact. We illustrate the benefits of this methodology by describing two applications: the interactive modeling of complex organic shapes in contact situations and the physically-based animation of such organic shapes.
  

Contact me
email: pj@cpsc.ucalgary.ca
Tel:  (403) 220 7041.