In this paper, we summarize our progress on two interaction techniques (point-based and ray-based) for haptic rendering. First, we describe a new point-based rendering technique that is computationally less expensive than previously proposed methods. We use a localized search procedure to reduce the number of computations and make it independent of the number polygons of the polyhedron. Second,...

In this paper we address the problem of reconstructing a structurally simple surface representation from point datasets of scanned scenes as they occur for instance in city scanning projects. Such datasets generally suffer from all kinds of scanning artifacts including noise, outliers, holes and irregular/anisotropic sampling. Most common surface reconstruction methods fail due to these shortco...

This paper presents a knowledge-based approach to the design of leased line networks. The tool OPTOLL assists in the optimization of networks by applying in a successive way a number of rules based on heuristics. The optimization so far is driven by the costs of the network, but other optimization criteria can be implemented in an easy way by modifying the knowledge base. The optimization start...

In 1989, Godrèche and Luck [1] introduced the concept of local mixtures of primitive substitution rules along the example of the well-known Fibonacci substitution and foreshadowed heuristic results on the topological entropy and the spectral type of the diffraction measure of associated point sets. In this contribution, we present a generalisation of this concept by regarding the so-called ‘nob...

Let F = fC 1 ; C 2 ; : : : ; C n g be a family of n disjoint convex bodies in the plane. We say that a set V of exterior light sources illuminates F, if for every boundary point u of any member of F there is a point v in V such that u is visible from v, i.e. the open line segment joining u and v is disjoint from F. An illumination system V is called primitive if no 1 2 Valeriu Soltan, LL aszll ...

Using the universal torsor method due to Salberger, we study approximation of a general fixed point by rational points on split toric varieties. We prove that under certain geometric hypothesis best approximations (in sense McKinnon-Roth's work) can be achieved curves passing through minimal degree, confirming conjecture McKinnon. These correspond, according Batyrev's terminology, centred primi...

In a simply-typed, call-by-value (CBV) language with rst-class continuations , the usual CBV xpoint operator can be deened in terms of a simple, innnitely-looping iteration primitive. We rst consider a natural but awed deenition, based on exceptions and \iterative deepening" of nite unfoldings, and point out some of its shortcomings. Then we present the proper construction using full rst-class ...

A novel method of texture primitive description using morphological skeleton is proposed. The skeleton of an object has the property that it is reduced to one point when the structuring element used for the skeletonization is exactly homothetic to the object. This method applies this property. This method minimizes the number of pixels contained in the skeleton. If we assume that the texture is...

A high activity of reactions can be confined in a model cell with a semipermeable membrane in the Schlögl model. It is interpreted as a model of primitive metabolism in a cell. We study two generalized models to understand the creation of primitive cell systems conceptually from the view point of the nonlinear-nonequilibrium physics. In the first model, a single-cell system with a highly active...