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Author:Hakala, Erik
Title:Hemispherical rasterization of shadow maps
Publication type:Master's thesis
Publication year:2010
Pages:60 + [10}      Language:   eng
Department/School:Informaatio- ja luonnontieteiden tiedekunta
Main subject:Vuorovaikutteinen digitaalinen media   (T-111)
Supervisor:Savioja, Lauri
Instructor:Laine, Samuli
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

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  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto     | Archive
Keywords:computer graphics
shadow maps
rasterization
tietokonegrafiikka
varjokartat
rasterointi
Abstract (eng): Hemispherical rasterization has many meaningful use cases of which one is shadow mapping for 180 degrees spot lights.
On a hemisphere, the standard rasterization methods yield high error and usually require high tessellation to reach acceptable quality levels.

In this thesis a method for analytic hemispherical rasterization on modern hardware is presented.
The algorithm offers a good and hassle free solution with manageable performance.
Also a quick look is taken at alternative approximative solution, which is then used as one of the reference techniques for the analytic method.

Theory is further reinforced with an implementation and analysis of its performance characteristics.
Finally, the method is concluded to be viable for interactive and off-line rendering applications.
Abstract (fin): Puolipallorasteroinnilla on monta merkittävää käyttötapausta, joista yksi on on varjokartat 180 asteen valoille.
Puolipallon pinnalla tavalliset rasterointitekniikat tuottavat suuren määrän virhettä.
Niinpä rasteroitava geometria täytyykin usein pilkkoa pienempiin osiin, jotta riitävä laatu saavutetaan.

Tässä teoksessa esitellään tekniikka jolla geometria voidaan rasteroida puolipallon pinnalle analyyttisesti hyödyntäen modernia laitteistoa.
Esiteltävä algoritmi tarjoaa helpon tavan tuottaa laadukkaita puolipallokuvia kohtuullisella nopeudella.
Teoksessa käsitellään myös yksinkertainen epätarkka ratkaisu, jota käytetään yhtenä vertailukohteena analyyttiselle tekniikalle.

Teoria on tuettuna käytännön toteutuksella tekniikasta.
Toteutuksen nopeudesta esitetään mittaustuloksia joiden perusteella tekniikan käytännöllisyyttä eri tilanteissa arvioidaan.
Tekniikka todetaan soveltuvan hyvin lähinnä interaktiivisiin ja raskaisiin renderointi sovelluksiin.
ED:2010-03-10
INSSI record number: 39059
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