My research can be categorised into three main areas: facial modelling and animation, AR and VR technology and applications, and simulation and sketch-based interfaces.

Computer facial modelling and animation

The tension between modelling and animation provokes much of my work, and was the subject of my PhDthesis awarded in 1999 (supervised by Dr Alan Watt). For example, three-dimensional facial animation is an area where modelling and animation are intimately linked and where our familiarity imposes strict judgement criteria. I am interested in all aspects of face processing. In recent years, I have graduated PhD students in face sketching, using MRI data for facial reconstruction, investigating the use of visemes in facial animation, and using visual speech in technology-enhanced learning. I am currently supervising two PhD students, one on physically-based animation of the mouth and one on recreating 3D mouth animation from 2D video.

AR and VR technology and applications

My work in this area has focussed mainly on digital heritage applications. In a recent AHRC/EPSRC-funded project with the Department of Archaeology and the School of Architecture, we investigated the use of augmented reality to display a long gone medieval Castle where it once stood in the centre of Sheffield. I am co-supervising an Archaeology PhD student investigating the use of 3D scans for analysis of clay pipe figurines. A recent project with the Department of Archaeology and the AMRC was to digitally reconstruct a unique UK archaeological site (Rothwell Charnel Chapel).

Simulation and sketch-based interfaces

This work is a collaboration with my colleague Dr Paul Richmond, who leads the work on simulation in the research group. We jointly supervise PhD students on a range of simulation projects using agent-based modelling and GPUs for transport and pedestrain simulations. We are also investigating efficient rendering for large scale simulations and real-time control of large-scale pedestrian simulations using a sketch-based interface.

Other previous work