Premium
Reusable Radiosity Objects
Author(s) -
Ouhyoung Ming,
Chuang YungYu,
Liang RungHuei
Publication year - 1996
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/1467-8659.1530347
Subject(s) - radiosity (computer graphics) , computer science , rendering (computer graphics) , visibility , object (grammar) , global illumination , computer vision , computer graphics (images) , artificial intelligence , physics , optics
Abstract Because of the view independence and photo realistic image generation in a diffuse environment, radiosity is suitable for an interactive walk through system. The drawback of radiosity is that it is time‐consuming in form factor estimation, and furthermore, inserting, deleting or moving an object makes the whole costly rendering process repeat itself. To solve this problem, we encapsulate necessary information for form factor calculation and visibility estimation in each object, which is called a reusable radiosity object. An object is defined as a cluster or clusters of triangles. Whenever a scene updates, the radiosity algorithm looks up the prestored information in each object, thus speeding itself up by two orders of magnitude. Besides, solution time based on cluster representatives is linear to the number of objects since each object is reusable, encapsulated with preprocessed data in every level of hierarchy. We also analyze the unregarded error on visibility estimation and propose a statistically optimal adaptive algorithm to maintain the same error for each link.