DSpace Kolekce:
http://hdl.handle.net/11025/11193
2020-09-23T03:31:14ZNailing and Pinning: Adding Constraints to Inverse Kinematics
http://hdl.handle.net/11025/11239
Název: Nailing and Pinning: Adding Constraints to Inverse Kinematics
Autoři: Greeff, Mardé; Haber, Jörg; Seidel, Hans-Peter
Editoři: Skala, Václav
Abstrakt: Inverse kinematics is commonly applied to compute the resulting movement of an avatar for a
prescribed target pose. The motion path computed by inverse kinematics, however, often differs
from the expected or desired result due to an underconstrained parameter space of the degrees-offreedom
of all joints. In such cases, it is necessary to introduce additional constraints, for instance
by locking a joint's position and / or rotation. We present a method to fix a joint in terms of
position and explain how to incorporate these constraints into the inverse kinematics solution.2005-01-01T00:00:00ZGreeff, MardéHaber, JörgSeidel, Hans-PeterA new formulation of differential radiosity and a rendering application
http://hdl.handle.net/11025/11238
Název: A new formulation of differential radiosity and a rendering application
Autoři: Arquès, D.; Biri, V.; Derpierre, O.
Editoři: Skala, Václav
Abstrakt: Among all the existing realistic lighting methods, the radiosity method is the only one that gives precisely an
analytic solution of diffuse light exchanges. The gradient of this solution have been studied but not often used in
a context of pure rendering. We present in this article a method to render a surface using the radiosity contour
levels. First, we define a differential formulation of the radiosity equation which leads us to a new expression of
the gradient of radiosity. We deduce from this general equation a simpler equation of this gradient in the case of
a planar surface lighted by a light source reduced to a point. Then we present our method to render planar
surfaces using a radial mesh that follows the contour levels of the radiosity. This method is shown to improve
the quality of the rendering and decrease the number of vertices used for rendering.2005-01-01T00:00:00ZArquès, D.Biri, V.Derpierre, O.Managing Data Flow in Interactive MR Environments
http://hdl.handle.net/11025/11237
Název: Managing Data Flow in Interactive MR Environments
Autoři: Dähne, Patrick; Seibert, Helmut
Editoři: Skala, Václav
Abstrakt: In this paper the concept and design of a software framework which provides a transparent data flow for interactive
Mixed Reality (MR) applications is discussed. The design was affected by our demands on platform independency,
simplicity, network transparency, maximum performance and availability of runtime debugging facilities. Our
software framework tries to simplify the development of MR applications by using the concept of a data flow
graph. The developer builds such a graph from a library of small software components that communicate via the
edges of the graph.2005-01-01T00:00:00ZDähne, PatrickSeibert, HelmutMinimization of the mapping error using coordinate descent
http://hdl.handle.net/11025/11236
Název: Minimization of the mapping error using coordinate descent
Autoři: Dzemyda, Gintautas; Bernataviciene, Jolita; Kurasova, Olga; Marcinkevicius, Virginijus
Editoři: Skala, Václav
Abstrakt: Visualization harnesses the perceptual capabilities of humans to provide the visual insight into data. Structure
preserving projection methods can be used for multidimensional data visualization. The goal of this paper is to
suggest and examine the projection error minimization strategies that would allow getting a better and less
distorted projection. The classic algorithm for Sammon’s projection and two new its modifications are examined.
All the algorithms are oriented to minimize the projection error because even a slight reduction in the projection
error changes the distribution of points on a plane essentially. The conclusions are made on the results of
experiments on artificial and real data sets.2005-01-01T00:00:00ZDzemyda, GintautasBernataviciene, JolitaKurasova, OlgaMarcinkevicius, Virginijus