| 18 |
|
.B "+/-g gname" |
| 19 |
|
][ |
| 20 |
|
.B "-c epsilon" |
| 21 |
+ |
][ |
| 22 |
+ |
.B "-x 'xf spec'" |
| 23 |
|
] |
| 24 |
|
[ |
| 25 |
|
.B input.obj .. |
| 86 |
|
.I +g |
| 87 |
|
option to save just the named group(s). |
| 88 |
|
.PP |
| 89 |
< |
Finally, a |
| 89 |
> |
The |
| 90 |
|
.I "\-c epsilon" |
| 91 |
< |
parameter may be given to coalesce vertices that are within the given epsilon. |
| 91 |
> |
option tells |
| 92 |
> |
.I robjutil |
| 93 |
> |
to coalesce vertices that are within the given epsilon. |
| 94 |
|
This is useful to improve the connectivity of models that were produced |
| 95 |
|
in a sloppy conversion process from independent polygons. |
| 96 |
|
When producing a Radiance file via the |
| 102 |
|
does not attempt to break up non-planar polygons into triangles, |
| 103 |
|
which is usually not a problem for .OBJ output, but may be for Radiance |
| 104 |
|
scene descriptions (+r). |
| 105 |
+ |
.PP |
| 106 |
+ |
The |
| 107 |
+ |
.I \-x |
| 108 |
+ |
option may be used to specify a final transform to apply to all |
| 109 |
+ |
coordinates in the file before output. |
| 110 |
+ |
This specification must be contained in a single quoted word and |
| 111 |
+ |
match the standard arguments used by |
| 112 |
+ |
.I xform(1), |
| 113 |
+ |
except that the |
| 114 |
+ |
.I \-a |
| 115 |
+ |
option is not supported for creating arrays of objects. |
| 116 |
+ |
Also, any scaling factors do not affect the epsilon value given for |
| 117 |
+ |
coalescing vertices, as this operation is applied prior to the transform, |
| 118 |
+ |
even if |
| 119 |
+ |
.I \-c |
| 120 |
+ |
appears later in the command line. |
| 121 |
|
.SH EXAMPLES |
| 122 |
|
To remove degenerate and duplicate faces from "orig.obj" and write to "final.rad": |
| 123 |
|
.IP "" .2i |
| 131 |
|
write to a Radiance triangle mesh using materials from "kitty.mat": |
| 132 |
|
.IP "" .2i |
| 133 |
|
robjutil +g cat +g bell kitty.obj | obj2mesh -a kitty.mat > kitty.rtm |
| 134 |
+ |
.PP |
| 135 |
+ |
To rotate the scene 90 degrees about the Y-axis and scale by 10: |
| 136 |
+ |
.IP "" .2i |
| 137 |
+ |
robjutil -x "-ry 90 -s 10" orig.obj > transformed.obj |
| 138 |
+ |
.SH NOTES |
| 139 |
+ |
The .OBJ output of |
| 140 |
+ |
.I robjutil |
| 141 |
+ |
uses relative indices, so files it produces may be concatenated |
| 142 |
+ |
on the input of other tools such as |
| 143 |
+ |
.I obj2rad |
| 144 |
+ |
and |
| 145 |
+ |
.I obj2mesh |
| 146 |
+ |
by piping from |
| 147 |
+ |
.I cat(1) |
| 148 |
+ |
or similar. |
| 149 |
+ |
This offers a convenient way to separate geometry from a single .OBJ |
| 150 |
+ |
input, manipulate it in some way, then recombine during conversion. |
| 151 |
+ |
.PP |
| 152 |
+ |
Unlike |
| 153 |
+ |
.I obj2rad |
| 154 |
+ |
and |
| 155 |
+ |
.I obj2mesh, |
| 156 |
+ |
.I robjutil |
| 157 |
+ |
with the |
| 158 |
+ |
.I +r |
| 159 |
+ |
option will not substitute the group name for a material id if no |
| 160 |
+ |
.I usemtl |
| 161 |
+ |
statements are found on the input. |
| 162 |
+ |
Instead, it will assign each surface the material |
| 163 |
+ |
.I DEFAULT_MATERIAL. |
| 164 |
+ |
Since it is possible to use the |
| 165 |
+ |
.I +/-g |
| 166 |
+ |
option to select groups to include or exclude on output, it is |
| 167 |
+ |
still possible to assign materials by group manually. |
| 168 |
|
.SH AUTHOR |
| 169 |
|
Greg Ward |
| 170 |
|
.SH "SEE ALSO" |
| 171 |
< |
obj2mesh(1), obj2rad(1) oconv(1), xform(1) |
| 171 |
> |
cat(1), obj2mesh(1), obj2rad(1) oconv(1), xform(1) |
