| 91 |
|
.TP |
| 92 |
|
.BI h =kf |
| 93 |
|
Divide the hemisphere using the LBNL/Klems "full" sampling basis. |
| 94 |
+ |
(Use "h=-kf" for left-handed coordinates.) |
| 95 |
|
.TP |
| 96 |
|
.BI h =kh |
| 97 |
|
Divide the hemisphere using the LBNL/Klems "half" sampling basis. |
| 98 |
+ |
(Use "h=-kh" for left-handed coordinates.) |
| 99 |
|
.TP |
| 100 |
|
.BI h =kq |
| 101 |
|
Divide the hemisphere using the LBNL/Klems "quarter" sampling basis. |
| 102 |
+ |
(Use "h=-kq" for left-handed coordinates.) |
| 103 |
|
.TP |
| 104 |
|
.BI h =rN |
| 105 |
|
Divide the hemisphere using Reinhart's substructuring of the Tregenza |
| 109 |
|
If it is not given, |
| 110 |
|
.I N |
| 111 |
|
defaults to 1, which is just the Tregenza sky. |
| 112 |
+ |
(Use "h=-rN" for left-handed coordinates.) |
| 113 |
|
.TP |
| 114 |
|
.BI h =scN |
| 115 |
|
Subdivide the hemisphere using the Shirley-Chiu square-to-disk mapping with an |
| 116 |
|
.I NxN |
| 117 |
|
grid over the square. |
| 118 |
+ |
(Use "h=-scN" for left-handed coordinates.) |
| 119 |
|
.TP |
| 120 |
|
.BI u =[-]{X|Y|Z|ux,uy,uz} |
| 121 |
|
Orient the "up" direction for the hemisphere using the indicated axis or direction |
| 144 |
|
In the receiver file, the |
| 145 |
|
.I source |
| 146 |
|
primitive is supported as well, and multiple receivers (and multiple output |
| 147 |
< |
matrices) are identified by different modifier names. |
| 147 |
> |
matrices) may be identified by different modifier names. |
| 148 |
> |
(Make sure that surfaces using the same modifier are grouped together.)\0 |
| 149 |
|
Though it may be counter-intuitive, receivers are often light sources, |
| 150 |
|
since samples end up there in a backwards ray-tracing system such as RADIANCE. |
| 151 |
|
When using local geometry, the overall aperture shape should be close to flat. |
