Graphics Reference
In-Depth Information
Variation in
viewing/ lighting
direction
Positional variation
in the small area
(a) BTF data
(b) BTF
BRDF
data
Figure 9.14
BTF data and BTF
BRDF
data.
BTF
BRDF
texture
at point
P
0
Transformation to a
response vector
Change in locatio
n
in the small area
P
0
P
1
P
2
Change in
viewing\lighting
direction
Response vector
at point
P
0
Figure 9.15
Construction of the response matrix.
Center of each cluster
Cluster
C
0
Matrix of
cluster
C
0
Cluster
C
1
Basis vectors
of cluster
C
0
Basis vectors
of cluster
C
1
Matrix of
cluster
C
1
Figure 9.16
Local PCA is applied while clustering the rows.
