| 7 |
|
[ |
| 8 |
|
.B "\-pC" |
| 9 |
|
][ |
| 10 |
+ |
.B "{+|-}a" |
| 11 |
+ |
][ |
| 12 |
|
.B "\-g Nlog2" |
| 13 |
|
][ |
| 14 |
|
.B "\-t pctcull" |
| 26 |
|
[ |
| 27 |
|
.B "\-pC" |
| 28 |
|
][ |
| 29 |
+ |
.B "{+|-}a" |
| 30 |
+ |
][ |
| 31 |
|
.B "\-g Nlog2" |
| 32 |
|
][ |
| 33 |
|
.B "\-t pctcull" |
| 56 |
|
by an immediately following integer argument. |
| 57 |
|
(The default progress bar length is 79 characters.)\0 |
| 58 |
|
.PP |
| 59 |
+ |
The |
| 60 |
+ |
.I \-a |
| 61 |
+ |
option turns off reciprocity averaging for isotropic scattering or anisotropic reflection. |
| 62 |
+ |
Normally on (+a), this ensures that the tensor BRDF obeys Helmholtz reciprocity. |
| 63 |
+ |
However, in certain rare cases, reciprocity averaging can cause unwanted noise in the output. |
| 64 |
+ |
.PP |
| 65 |
|
The maximum resolution of the tensor tree may be controlled by the |
| 66 |
|
.I \-g |
| 67 |
|
option, which defaults to a value of 6. |
| 118 |
|
options, and should obey both Helmholtz reciprocity and |
| 119 |
|
integrate to less than 1 over each projected incident hemisphere |
| 120 |
|
for energy conservation. |
| 121 |
+ |
The variable and function definitions in each |
| 122 |
+ |
.I \-f source |
| 123 |
+ |
file are read and compiled from the RADIANCE library where it is found. |
| 124 |
|
If the |
| 125 |
|
.I \-t3 |
| 126 |
|
option is specified, the defined function is assumed to be isotropic. |
| 153 |
|
isotropic Phong distribution: |
| 154 |
|
.IP "" .2i |
| 155 |
|
bsdf2ttree -g 5 -t3 -e 'phong(ix,iy,iz,ox,oy,oz) = if(iz, .1+((iz+oz)/sqrt((ix+ox)^2+(iy+oy)^2+(iz+oz)^2))^50, 0)' phong > phong.xml |
| 156 |
+ |
.SH ENVIRONMENT |
| 157 |
+ |
RAYPATH the directories to check for auxiliary files. |
| 158 |
|
.SH AUTHOR |
| 159 |
|
Greg Ward |
| 160 |
|
.SH "SEE ALSO" |
