Volume 6, number 1-3 (1998) Collection home page

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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 48
Zlatanova, S. , Painsil, J. , Tempfli, K.
3D object reconstruction from aerial stereo images

Among the variety of problems in providing 3D information about topographic objects, efficient data collection and model construction are issues for research. The efforts are directed towards improving the tedious, time and man-power consuming process of data generation by applying au...

Yu, Young-Jung , Jung, Ho-Youl , Cho, Hwan-Gue
A new rendering technique for water droplet using metaball in the gravitation force

Till now there are many rendering models for water and other fluids and their dynamics. Especially in order to generate the curved surface of flexible objects such as water, jelly, and snow, the implicit metaball formulation is widely used in favor of its simplicity...

Wcisło, Rafał , Kitowski, Jacek , Mościński, Jacek
Cellular automaton as a fast tool for animation of liquid in multi-object scenes

The paper presents the usage of a cellular automaton (CA) in three-dimensional computer animations. The main goal is to achieve a fast, realistic motion of a set of bodies. In order to fulfil the demand of "reality" we try to employ the simulation methods based ...

Steele, Kevin L. , Egbert, Parris K.
A unified framework for collision detection, avoidance, and response

Collision detection and collision avoidance algorithms are necessary for accurate and realistic animation, but are presently implemented separately and independently. This is a disadvantage when designing some simulations or animations which would otherwise benefit from the availability...

Sanna, Andrea , Montuschi, Paolo
An efficient algorithm for ray casting of CSG animation frames

This paper presents a new algorithm to generate ray casted CSG animation frames. We consider sequences of frames where only the objects can move, in this way, we take advantage of the high screen area coherence of this kind of animation. A new definition of bo...

Podgorelec, David , Žalik, Borut , Kolmanič, Simon
Interactive modyfying the method set of a geometric constraint

In the paper, a way of making geometric constraints more flexible is described. This approach is employed in our new interactive 2D constraint-based drawing system. Multidirectional constraints should be very powerful to find exactly the results expected by a user when more ...

Khouas, Leila , Odet, Christophe , Friboulet, Denis
3D furlike texture generation by a 2D autoregressive synthesis

This paper presents a texture model that allows a two dimensional synthesis of 3D furlike texture. The model is based on the modelling of the texture autocorrelation function (ACF) and a two dimensional AutoRegressive synthesis (2D AR). We consider that the appearance of...

Moltedo, L. , Vitulano, D.
An automatic classification of materials degradation

A novel model to achieve a mathematical formalism for an automatic classification of materials degradation kinds is proposed. In the image analysis phase, wavelet transform local maxima are computed in order to detect the degradation shapes edges. In the second phase, at&#x...

Lebiedź, Jacek
Structural description of digitized straight line segments

This paper presents a structural description of digitized straight line segments and shows a scan converting algorithm based on this description. At the end, the obtained structural algorithm is compared with Bresenham´s algorithm. The former seems to be faster than the latter.

Kolingerová, I.
Genetic approach to the minimum weight triangulaiton

The weight of a triangulation is the sum of the Euclidean lengths of its edges. A minimum weight triangulation is such a triangulation which minimizes the weight among all triangulations of the given point set. Finding the MWT is difficult as for general data sets, no...

Paula Pádua Filho, Wilson de , Ribeiro, Berthier , Menezes, Vânia Maria de , Oliveira, Adriana Andrade , Pádua, Guilherme P. S. , Moura Macedo, Erben de
A GIS-based environment for telecommunications engineering

This work describes a large GIS-based environment for the support of planning and design activities in Telecommunications Engineering. This environment supports various activities such as the acquisition of geographic and engineering data, the design of outside plants for telecommunications...

Zhu, Ying , Chen, Jim X.
Establishing a 3D human gait and knee model

This paper presents a system interactively simulating the human gait cycle and knee joint. The goal of the system is to help understanding and analyzing the knee behavior during gait cycle. We establish a model of the lower half of the human body. The model can simul...

Zaninetti, Jacques , Peroche, Bernard
A vector model for global illumination in ray tracing

This paper presents a method taking global illumination in ray tracing into account. A vector approach is introduced which allows to use any type of material, in particular with directional properties. This vector is decomposed into a direct component associated to light sources an...

Wang, Biao , Wu, Zhuang , Sun, Qingping , Yuen, Matthew M. F.
A deformation model of thin flexible surfaces

In engineering, it is often needed to determine the deformed shape of thin flexible surfaces, such as fabrics, paper, etc. under the action of applied loads. In this paper, a variational formulation was developed for such cases. It serves as the foundation for developing the&#...

Wonka, Peter , Gervautz, Michael
Ray tracing of nonlinear fractals

We present a new kind of parametric Lindenmayer-systems called nonlinear CSG-pL-systems, which are useful for the modeling of nonlinear fractals and fractal like objects. Nonlinear CSG-pL-systems describe cyclic CSG-Graphs, which can include several nonlinear transformations. To render the given objec...

Chen, Jim X. , Wegman, Edward J. , Wang, Jingfang
Animation of dust behaviors in a networked virtual environment

Real-time simulation of physically realistic complex dust behavior is very useful in computer simulation, training, education, art, advertising, and entertainment. There is no successful model for realistic dust behaviors generated by a traveling vehicle. In this paper, we use particle systems&#x...

Ulmer, H. , Lindenbeck, Ch.
Geology meets virtual reality: VRML visualization server applications

The setup of a VRML visualization server is discussed. The so called VRengine is embedded in a World Wide Web server site accessible by the Internet community. Two geological applications show the advantages of the concept for the visualization of extended data sets. Model spe...

Starling, Michael , Ashdown, Neil
Impressionistic techniques for rendering woodland scenes

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 ...

Kamen, Yakov , Shirman, Leon
A new look at mipmap level estimaiton techniques

In this work, we study various methods of mipmap level estimation. We show that despite their differences, these methods depend on the interpolated inverse homogeneous coordinate. We introduce a new method based on homogeneous coordinates only that has functionality and efficiency advantages...

Puntambekar, Nirant V. , Jablokow, Andrei G.
Selection of the number of control points for spline surface approximation

Parametric spline surfaces represent an important surface type in the process of reverse engineering. Various surface fitting techniques are available for fitting of splines to sets of data points, here we consider a least squares fitting technique. A user input to this algorithm i...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 48