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Optimizations of Cascaded Shadowmapping for Large Terrains

Johannes, Dobler (2016) Optimizations of Cascaded Shadowmapping for Large Terrains. Bachelorarbeit, Ostbayerische Technische Hochschule Regensburg.

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Kurzfassung

Shadowing effects greatly improve the realism and the perception of virtual 3D environments by providing useful visual cues. But due to their global nature, a high computational effort is needed. Shadowmapping is one of the most popular approaches for real-time rendering. A more advanced Shadowmapping technique often used for larger areas is Cascaded Shadowmapping (CSM). Since it is an image based method it has several aliasing and artifact problems as the rendered data sets get bigger and the terrains get larger. To reduce these problems several optimizations are proposed, described and evaluated in this thesis: Most applications set the near and far plane of the view frustum to static values. By calculating these plane values dynamically, the sampling rate of each shadowmap is highly improved as the texture space is used more efficiently. Furthermore, each cascade is extended towards the negative light direction in order to handle missing shadows which originally result from wrapping the cascades around the view frustum. Shadow flickering is another issue which is caused by dynamically calculating cascade sizes. This is highly reduced by moving the cascade sizes in texel steps and changing its size in custom discrete steps. A Cascaded shadowmap specific problem poses overlapping areas. By discarding fragments of these overlapping areas in the larger cascades, it is guaranteed that every object is only represented in a single shadowmap. These optimizations are described and tested by using a Terrain Renderer which is mapping topography to a sphere to visualize planets. This Terrain Renderer is using Level of Detail and dynamic data loading. Thus, these concepts are also taken into account. The results show that the shadow quality and stability is highly increased while not compromising the performance Shadowmapping is providing. It can be used for shadowing large terrains that are illuminated by the sunlight.

elib-URL des Eintrags:https://elib.dlr.de/103861/
Dokumentart:Hochschulschrift (Bachelorarbeit)
Titel:Optimizations of Cascaded Shadowmapping for Large Terrains
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Johannes, DoblerNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:30 März 2016
Referierte Publikation:Nein
Open Access:Nein
Seitenanzahl:59
Status:veröffentlicht
Stichwörter:Shadowmapping
Institution:Ostbayerische Technische Hochschule Regensburg
Abteilung:Fakultät Elektro- und Informationstechnik
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Technik für Raumfahrtsysteme
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R SY - Technik für Raumfahrtsysteme
DLR - Teilgebiet (Projekt, Vorhaben):R - Projekt ATON (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Simulations- und Softwaretechnik
Hinterlegt von: Aslandere, MSc Turgay Isik
Hinterlegt am:09 Mai 2016 09:30
Letzte Änderung:09 Mai 2016 09:30

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