| 4 |
|
vwrays - compute rays for a given picture or view |
| 5 |
|
.SH SYNOPSIS |
| 6 |
|
.B vwrays |
| 7 |
< |
.B "[ -i -f{a|f|d} | -d ]" |
| 7 |
> |
.B "[ -i -u -f{a|f|d} -c rept | -d ]" |
| 8 |
|
{ |
| 9 |
|
.B "view opts .." |
| 10 |
|
| |
| 25 |
|
.I \-i |
| 26 |
|
option may be used to specify desired pixel positions on the standard |
| 27 |
|
input rather than generating all the pixels for a given view. |
| 28 |
+ |
If the |
| 29 |
+ |
.I \-u |
| 30 |
+ |
option is also given, output will be unbuffered. |
| 31 |
|
.PP |
| 32 |
|
The |
| 33 |
|
.I \-f |
| 37 |
|
requirements of transferring and interpreting information in |
| 38 |
|
.I rtrace. |
| 39 |
|
.PP |
| 40 |
+ |
The |
| 41 |
+ |
.I \-c |
| 42 |
+ |
option repeats each pixel the given number of times (default is 1). |
| 43 |
+ |
This is most useful when sending rays to |
| 44 |
+ |
.I rcontrib(1) |
| 45 |
+ |
with the same |
| 46 |
+ |
.I \-c |
| 47 |
+ |
setting, providing a much faster way to average pixels over image sets. |
| 48 |
+ |
The |
| 49 |
+ |
.I \-pj |
| 50 |
+ |
option should be used to jitter sample postions in most cases. |
| 51 |
+ |
.PP |
| 52 |
|
View options may be any combination of standard view parameters described |
| 53 |
|
in the |
| 54 |
|
.I rpict(1) |
| 105 |
|
.PP |
| 106 |
|
If a picture is given on the command line rather than a set of view options, |
| 107 |
|
then the view and image dimensions are taken from the picture file, and |
| 108 |
< |
the reported ray origins and directions will exactly match the center of each |
| 109 |
< |
pixel in the picture. |
| 108 |
> |
the reported ray origins and directions will match the center of each |
| 109 |
> |
pixel in the picture (plus optional jitter). |
| 110 |
|
.PP |
| 111 |
|
If a depth buffer file is given as well, then |
| 112 |
|
.I vwrays |
| 120 |
|
To compute the ray intersection points and returned directions corresponding |
| 121 |
|
to a picture and its depth buffer: |
| 122 |
|
.IP "" .2i |
| 123 |
< |
vwrays scene_v2.pic scene_v2.zbf > scene_v2.pts |
| 123 |
> |
vwrays scene_v2.hdr scene_v2.zbf > scene_v2.pts |
| 124 |
|
.PP |
| 125 |
|
To determine what the dimensions of a given view would be: |
| 126 |
|
.IP "" .2i |
| 127 |
< |
vwrays -d -vf myview.vf -x 2048 -y 2048 |
| 127 |
> |
vwrays \-d \-vf myview.vf \-x 2048 \-y 2048 |
| 128 |
|
.PP |
| 129 |
|
To generate a RADIANCE picture using |
| 130 |
|
.I rtrace |
| 131 |
|
instead of |
| 132 |
|
.I rpict: |
| 133 |
|
.IP "" .2i |
| 134 |
< |
vwrays -ff -vf view1.vf -x 1024 -y 1024 | |
| 135 |
< |
rtrace `vwrays -d -vf view1.vf -x 1024 -y 1024` -ffc scene.oct > view1.pic |
| 134 |
> |
vwrays \-ff \-vf view1.vf \-x 1024 \-y 1024 | |
| 135 |
> |
rtrace `vwrays \-d \-vf view1.vf \-x 1024 \-y 1024` \-ffc scene.oct > view1.hdr |
| 136 |
|
.SH AUTHOR |
| 137 |
|
Greg Ward Larson |
| 138 |
|
.SH ACKNOWLEDGMENT |
| 144 |
|
a rendered picture, it will only produce standard scanline-ordered rays when |
| 145 |
|
given a set of view parameters. |
| 146 |
|
.SH "SEE ALSO" |
| 147 |
< |
rcalc(1), rpict(1), rtcontrib(1), rtrace(1) |
| 147 |
> |
rcalc(1), rpict(1), rcontrib(1), rtrace(1) |
