This paper presents a unified rasterization method to render parametric curves and patches. The algorithms are extremely simple and fast. No multiplication and division are required. The proposed method combines strong sides of parametric and nonparametric representation of curves and patch...

Visualization of large medical data sets requires advanced techniques in image processing and data reduction. Compound data sets, which consist of several types of data, necessitate special treatment for each component. A data set which consists of both volumetric data and geomet...

This work describes DynSys3D, a framework for testing and implementing visualization techniques in the area of three-dimensional dynamical systems. DynSys3D has been designed to meet requirements which allow a fast and modular investigation of dynamical systems. Such requirements are, e.g., exten...

In this paper, a 2D constraint-based drawing system which distinguishes between visible and auxiliary geometry is presented. The auxiliary geometry is fixed by the geometrical constraints and represents a framework on which the entities of the visible geometry are mapped. In continuation...

Spline surfaces are very popular for the modeling of free form surfaces. This is because they are very flexible, conceptually simple and the shape can be easily controlled by manipulating control points. However, for complex shapes one has to deal with an overwhelming&...

Real-world data, esp. three-dimensional measurements of buildings, contain various irregularities, e.g. common vertices of building parts. These irregularities cause large problems in data conversion from CSG to B-rep. We will present an approach which can tackle these irregularities using ...

In 3D rendering of volumetric CT data the alpha-blending technique can be used for modeling semitransparent tissues. This method assigns di erent opacity values to di erent tissue types. In practice, only four materials can be separated according to their CT numbers (H...

Mass-spring-damper (MSD) models have been used by a number of researchers in attempts to model deformable objects. One of the main advantages of this approach is its simplicity. This means that it can be implemented quickly and it is also relatively easy to integrate&#x...

We present a new approach to define reliable boolean operations on polyhedral solids. Firstly, it is based on the refinement of embedded combinatorial 3-maps. Secondly, it uses algebraic specifications and rewriting techniques that leads to a proper formal definition. This approach permits&#...

We present in this paper a method for rendering three dimentionnal scalar fields. We make an accurate bijection between scalar fields and a participating media haze in order to get an intuitive interpretation of the field. We propose a physic based illumination model, w...

Virtual reality applications such as architectural walkthroughs require a powerful graphics hardware to achieve interactive frame rates of rendering. Usual rendering algorithms like z-buffer or BSP-tree often spend significant time processing portions of model that are currently invisible ...

This paper deals with visual models of plants. A new method for fast determination of growth direction of the growing elements in artificial plants is presented here. The most important factor is the amount and direction of light incidenting surface of leaves in our�...

This paper describes our work of using Wavelet Transformation to compress and encode images in order to appropriately support image data handling in mobile systems. The paper at first introduces the motivation and our basic idea of supporting the efficiency and adaptivity at the&#x...

This contribution describes the progress that has been achieved in the early stage of the project for rendering and animation of the archaeological site of circular structure in Tesetice, Czech Republic. The model of the site is based on CSG and it was currently rendered ...

The work presented here describes the power of 2D animation with texture mapping controlled by line drawings. Animation is specifically intended for facial animation and not restricted by human face. We have initially a sequence of facial images which are taken from a video se...

Photorealistic rendering is used to generate views of computer stored scenes. Global illumination algorithms take all transfers of light in the scene into account thereby creating a realistic looking image. Previously several approaches have been presented which are able to deal ...

The authors have been working on the simulation of trees and in particular their representation in the landscape when massed as woodland or forest. The purpose of this work is to provide a representation of trees en masse that is more visually convincing when used in ...

We introduce here an extension of the work done by Jones [1] on the direct surface rendering (DSR) algorithm for volume data. The original D.S.R. algorithm operates over linear, voxel based data giving high-resolution ray-traced images of iso-surfaces within a volume. The work pres...

Visualization tools are not only useful for displaying results of computational simulations; they also may serve as a graphical debugger for the development of numerical simulation applications. The object-oriented visualization tool presented here takes the additional requirements into account. It&#x...

Generative modeling environments typically use a semantic description of a scene, which can be processed by a generation system to produce one or more geometric instatnces. In order to support an interactive environment for generative geometric modeling it is necessary to be able t...