By Désirée Hilbring

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Additional info for 3D-GIS Visualisierung in der Umweltinformatik (German Edition)

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Dabei kann die reguläre von der irregulären Dekomposition unterschieden werden. Bei der regulären Dekomposition wird das Volumenobjekt aus Grundelementen der gleichen Form zusammengesetzt, während bei der irregulären Dekomposition unterschiedliche Primitive zur Bildung des Volumenobjekts benutzt werden. 1 Graphik-Pipeline 27 • Flächenextraktion zur Definition von Isoflächen und Visualisierung der Flächen. • Semitransparente Ausgabe des Volumendatensatzes. Strömungsdaten sind auf einem strukturierten Gitter gegeben und besitzen mindestens eine vektorielle Größe, den Geschwindigkeitsvektor [Schumann und Müller 2000a].

Im Folgenden werden kurz die gängigsten Schattierungsverfahren in der Reihenfolge steigender Qualität und steigenden Rechenaufwands erläutert: • Flat-Shading: Beim Flat-Shading wird dem kompletten Dreieck ein bestimmter Farbwert zugewiesen. • Gouraud-Shading: Beim Gouraud-Shading werden die Farbwerte der Eckpunkte des Dreiecks berechnet und dazwischen wird linear interpoliert. • Phong-Shading: Phong-Shading benutzt zur Berechnung der Farbwerte eine Interpolation der Eckpunktnormalen. 1 Graphik-Pipeline 33 • Ray-Tracing: Das Ray-Tracing verfolgt Lichtstrahlen für die Bildberechnung.

Das Verhältnis der vorderen und hinteren „Clipping“-Ebenen sollte aber einen bestimmten Wert nicht überschreiten, weil es den „Z-Puffer-Algorithmus“ beeinflusst. Dieser Algorithmus wird verwendet, um festzustellen, welchen Farbwert ein Pixel auf dem Ausgabemedium bekommt. Legt man für jedes Pixel der Oberfläche des Ausgabemediums einen Strahl entlang der z-Achse in die Tiefe der 3D-Szene an, ändert sich der zugehörige Farbwert entlang des Strahles, abhängig davon, welches visualisierte Objekt an dieser Stelle vom Strahl geschnitten wird.

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