Mathematisch-Naturwissenschaftliche Fakultät - Jahrgang 2008

Titel

Tessellation and rendering of trimmed NURBS models in scene graph systems

Autor

Ákos Balázs

Publikationsform

Dissertation

Abstract

Today scene graphs are ubiquitous in computer graphics: since they provide both a well suited data structure and an abstraction layer, almost all modern graphics applications employ some sort of scene graph. Unfortunately most scene graphs do not support higher order primitives (such as trimmed NURBS) adequately, even though in Computer Aided Design (CAD) systems the de facto standard surface representation is trimmed NURBS surfaces.
This thesis describes how the trimmed NURBS representation can be seamlessly integrated into a scene graph system.
For rendering purposes, geometries in the trimmed NURBS representation are almost always transformed into a polygonal representation. However, since this process is quite complicated if trimming is involved, creating a robust implementation is not straightforward. Another related problem is that when exporting complex NURBS models from CAD/CAM systems the topology information is sometimes lost and is usually very hard to reconstruct. This may result in annoying rendering artifacts when two adjacent surfaces do not join seamlessly. more...

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