TY  - JOUR
AU  - Neumann, L
AU  - Neumann, A
AU  - Szirmay-Kalos, László
TI  - Compact metallic reflectance models
JF  - COMPUTER GRAPHICS FORUM
J2  - COMPUT GRAPH FORUM
VL  - 18
PY  - 1999
IS  - 3
SP  - 161
EP  - 172
PG  - 12
SN  - 0167-7055
UR  - https://m2.mtmt.hu/api/publication/2612464
ID  - 2612464
AB  - The paper presents simple, physically plausible, but not physically
based reflectance models for metals and other specular materials. So
far there has been no metallic BRDF model that is easy to compute,
suitable for fast importance sampling and is physically plausible. This
gap is filled by appropriate modifications of the Phong, Blinn and the
Ward models. The Phong and the Blinn models are known not to have
metallic characteristics. On the other hand, this paper also shows that
the Cook-Torrance and the Ward models are not physically plausible,
because of their behavior at grazing angles. We also compare the
previous and the newly proposed models. Finally, the generated images
demonstrate how the metallic impression can be provided by the new
models.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Neumann, L
AU  - Neumann, A
AU  - Szirmay-Kalos, László
TI  - Reflectance models with fast importance sampling
JF  - COMPUTER GRAPHICS FORUM
J2  - COMPUT GRAPH FORUM
VL  - 18
PY  - 1999
IS  - 4
SP  - 249
EP  - 265
PG  - 17
SN  - 0167-7055
DO  - 10.1111/1467-8659.00378
UR  - https://m2.mtmt.hu/api/publication/2612466
ID  - 2612466
AB  - We introduce a physically plausible mathematical model for a large
class of BRDFs. The new model is as simple as the well-known Phong
model, but eliminates its disadvantages. It gives a good visual
approximation for many practical materials: coated metals, plastics,
ceramics, retro-reflective paints, anisotropic and retro-reflective
materials, etc. Because of its illustrative properties it can be used
easily in most commercial software and because of its low computational
cost it is practical for virtual reality. The model is based on a
special basic BRDF definition, which meets the requirements of
reciprocity and of energy conservation. Then a class of BRDFs is
constructed from this basic BRDF with different ent weight functions,
The definition of such weight functions requires the user to specify
the profile of the highlights,from which the weight function is
obtained by derivation. It is also demonstrated how importance sampling
can be used with the new BRDFs.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Neumann, László
AU  - Neumann, Attila
AU  - Szirmay-Kalos, László
TI  - Reflectance Models by Pumping up the Albedo Function
JF  - MACHINE GRAPHICS AND VISION
J2  - MACH GRAPH VIS
VL  - 8
PY  - 1999
IS  - 1
SP  - 3
EP  - 18
PG  - 16
SN  - 1230-0535
UR  - https://m2.mtmt.hu/api/publication/2616721
ID  - 2616721
LA  - English
DB  - MTMT
ER  -