Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
SHADOW GENERATION FOR VOLUMETRIC DATA SETS
Autore:
VANLENGEN RH; MEYER J; MATZAT M; HAGEN H;
Indirizzi:
UNIV KAISERSLAUTERN,DEPT COMP SCI,POB 3049 D-67653 KAISERSLAUTERN GERMANY
Titolo Testata:
The visual computer
fascicolo: 2, volume: 14, anno: 1998,
pagine: 83 - 94
SICI:
0178-2789(1998)14:2<83:SGFVDS>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Keywords:
VOLUME VISUALIZATION; SCIENTIFIC VISUALIZATION; MEDICAL IMAGING; SHADOW Z-BUFFER; SHADOW MAP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
CompuMath Citation Index
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
R.H. Vanlengen et al., "SHADOW GENERATION FOR VOLUMETRIC DATA SETS", The visual computer, 14(2), 1998, pp. 83-94

Abstract

Shadow information is essential for visual perception of complex scenes. Both shadow location and orientation clarify spatial relationshipsbetween objects. Shadows improve depth perception and the impression of realism. Our algorithm, integrated into a hybrid rendering system for medical data sets, is based on a shadow Z-buffer technique for fastand efficient shadow generation. Volumetric data contain information about the grid points only. Such data do not provide surface information that could be projected immediately onto the shadow map. To solve this problem, we have implemented two techniques. The first uses a modified adaptive version of the well-known marching cubes algorithm for the special characteristics of medical data sets. The algorithm uses material properties for a precise representation of object boundaries, generating volumetric objects quickly and effectively. There are two representations of the same data set: we use a view-independent approximation to display shadows and the original representation of the volumefor object visualization in full precision. The second algorithm usesa ray-tracing approach to create shadow maps. The same routine is used for object rendering, but is restricted to depth-value generation. Semitransparent objects are handled by storing an intensity profile in addition to the depth value.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 14:18:06