http://hdl.handle.net/1880/45700 Mon, 20 May 2013 06:34:25 GMT 2013-05-20T06:34:25Z http://hdl.handle.net/1880/46626 Title: TOWARDS GENERALISED MOTION DYNAMICS FOR ANIMATION Authors: Herr, Charles; Wyvill, Brian Abstract: Dynamic simulation has the advantage that the motion is produced from a model of the real world. However, including such physical descriptions in an animation system in a general way is difficult due to the problem of describing the simulation in high level terms. The lowest level primitives are forces, torques and masses and a set of differential equations that relate these primitives to the motion. We describe here an approach to integrating a high level set of primitives into a general purpose animation system via an intermediate language called CHARLI. Interactive user interfaces can be built on top of CHARLI to allow a user to specify motion dynamics for a fairly complex set of interacting bodies. Wed, 01 Nov 1989 00:00:00 GMT http://hdl.handle.net/1880/46626 1989-11-01T00:00:00Z http://hdl.handle.net/1880/46256 Title: A SURVEY OF LAYERED CONSTRUCTION TECHNIQUES USING DEFORMABLE MODELS IN THE ANIMATION OF ARTICULATED FIGURES Authors: Lemos, Robson; Wyvill, Brian Abstract: A survey on layered construction techniques using deformable models such as muscle, fatty tissue or skin in the animation of articulated figures is presented. The main goal is to describe the present layered construction techniques and to identify the relationships between them in the application to a range of issues in the animation of articulated figures including geometric deformation models and biomechanic based models used to model and to animate parts of the bodies of humans and animals. Finally, some open problems and trends in the utilization of such techniques are presented. Tue, 01 Dec 1998 00:00:00 GMT http://hdl.handle.net/1880/46256 1998-12-01T00:00:00Z http://hdl.handle.net/1880/46255 Title: TEXTURE MAPPING THE BLOBTREE Authors: Tigges, Mark; Wyvill, Brian Abstract: Recently an automatic solution to the problem of applying 2D textures to an implicit surface has been introduced (13). The method derives a uv-texture coordinate system by tracing particles from the implicit surface to a \fIsupport surface\fR. In this paper, we describe the adaptation of this algorithm to the \fIBlobTree\fR data structure. The \fIBlobTree\fR provides an implicit modelling system through a hierarchy of blends, CSG and warping applied to primitives. There are several problems involved in applying textures in such a general modelling system, particularly across CSG junctions. In this paper we identify these problems and introduce some simple solutions. Sun, 01 Mar 1998 00:00:00 GMT http://hdl.handle.net/1880/46255 1998-03-01T00:00:00Z http://hdl.handle.net/1880/46254 Title: THE BLOB TREE- WARPING, BLENDING AND BOOLEAN OPERATIONS IN AN IMPLICIT SURFACE MODELING SYSTEM Authors: Wyvill, Brian; Guy, Andrew; Galin, Eric Abstract: Automatic blending has characterized the major advantage of implicit surface modeling systems. Recently, the introduction of deformations based on space warping and boolean operations between primitives has increased the usefulness of such systems. We propose a further enhancement which will greatly enhance the range of models that can be easily and intuitively defined with a skeletal implicit surface system. We describe an hierarchical method which allows arbitrary compositions of models that make use of blending, warping and boolean operations. We call this structure the BlobTree. Blending and space warping are treated in the same way as union, difference and intersection, i.e. as nodes in the BlobTree. The traversal of the BlobTree is described along with two rendering algorithms; a polygonizer and a ray tracer. We present some examples of interesting models which can be made easily using our approach that would be very difficult to represent with conventional systems. Sun, 01 Mar 1998 00:00:00 GMT http://hdl.handle.net/1880/46254 1998-03-01T00:00:00Z