man/man1/rvu.1

.\" RCSid "$Id: rvu.1,v 1.3 2005/06/13 20:07:55 greg Exp $"
.TH RVU 1 1/1/04 RADIANCE
.SH NAME
rvu - generate RADIANCE images interactively
.SH SYNOPSIS
.B rvu
[
.B "rpict options"
][
.B "\-o dev"
][
.B \-b
][
.B "\-pe exposure"
]
[
.B $EVAR
]
[
.B @file
]
.B octree
.br
.B "rvu [ options ] \-defaults"
.br
.B "rvu \-devices"
.SH DESCRIPTION
.I Rvu
generates RADIANCE images using
.I octree.
(The octree may be given as the output of a command enclosed in quotes
and preceded by a `!'.)\0
Options specify the viewing parameters as well as
giving some control over the calculation.
Options may be given on the command line and/or read from the
environment and/or read from a file.
A command argument beginning with a dollar sign ('$') is immediately
replaced by the contents of the given environment variable.
A command argument beginning with an at sign ('@') is immediately
replaced by the contents of the given file.
The options are the same as for rpict(1), with a few notable exceptions.
The
.I "\-r, \-z, \-S, \-P, \-PP"
and
.I \-t
options are not supported, and
.I \-o
specifies which output device is being used instead of the output
file.
The
.I "\-x, \-y"
and
.I \-pa
options are unnecessary, since
.I rvu
scales the display image to the specified output device.
Additionally, the
.I \-b
option improves the display on greyscale monitors, and
.I \-pe
may be used to set an initial exposure value.
.PP
In the second form, the default values
for the options are printed with a brief explanation.
In the third form, the list of supported output devices
is displayed.
.PP
.I rvu
starts rendering the image from the selected viewpoint and
gradually improves the resolution of the display until
interrupted by keyboard input.
.I rvu
then issues a prompt (usually ':') and accepts a command
line from the user.
.I rvu
may also stop its calculation and wait for command input if
the resolution of the display has reached the resolution of the
graphics device.
At this point, it will give the 'done:' prompt and await further
instructions.
If
.I rvu
runs out of memory due to lack of resources to store its computed
image, it will give the 'out of memory:' prompt.
At this prompt, the user can save the image, quit, or even restart
a new image, although this is not generally recommended
on virtual memory machines for efficiency reasons.
.PP
.I rvu
is not meant to be a rendering program, and we strongly recommend that
.I rpict(1)
be used instead for that purpose.
Since
.I rpict(1)
does not store its image in memory or update any display of its output,
it is much faster and less wasteful of its resources than
.I rvu.
.I rvu
is intended as a quick interactive program for deciding viewpoints
and debugging scene descriptions and is not suited for producing
polished images.
.SH COMMANDS
Once the program starts, a number of commands can be used
to control it.
A command is given by its name, which can be abbreviated,
followed by its arguments.
.TP 10n
.BI aim " [ mag [ x y z ] ]"
Zoom in by
.I "mag"
on point
.I "x y z".
The view point is held constant;
only the view direction and size are changed.
If
.I "x y z"
is missing, the cursor is used to select the view center.
A negative magnification factor means zoom out.
The default factor is one.
.TP
.BR ^C
Interrupt.
Go to the command line.
.TP
.BI exposure " [ spec ]"
Adjust exposure.
The number
.I spec
is a multiplier used to compensate the average exposure.
A value of 1 renormalizes the image to the computed average, which
is usually done immediately after startup.
If
.I spec
begins with a '+' or '-', 
the compensation is interpreted in f-stops (ie. the power of two).
If
.I spec
begins with an '=', an absolute setting is performed.
An '=' by itself permits interactive display and setting of the exposure.
If
.I spec
begins with an '@', the exposure is adjusted to present similar
visibility to what would be experienced in the real environment.
If
.I spec
is absent, or an '@' is followed by nothing, then
the cursor is used to pick a specific image
location for normalization.
.TP
.BI focus " [distance]"
Set focus distance for depth-of-field sampling.
If a distance in world coordinates is absent, then the cursor
is used to choose a point in the scene on which to focus.
(The focus distance setting does not affect rendering in
.I rview,
but can be used in
.I rpict
with the
.I \-pd
option to simulate depth-of-field on views saved from
.I rview.)
.TP
.BI frame " [ xmin ymin xmax ymax ]"
Set frame for refinement.
If coordinates are absent, the cursor is used to
pick frame boundaries.
If ``all'' is specified, the frame is reset to the entire image.
.TP
.BR free
Free cached object structures and associated data.
This command may be useful when memory is low and a completely
different view is being generated from the one previous.
.TP
.BI last " [ file ]"
Restore the previous view.
If a view or picture
.I file
is specified, the parameters are taken from the last view entry
in the file.
.TP
.BI L " [ vw [ rfile ] ]"
Load parameters for view
.I vw
from the
.I rad(1)
input file,
.I rfile.
Both
.I vw
and
.I rfile
must be given the first call, but subsequent calls will use the last
.I rfile
as a default, and "1" as the default view (ie. the first view
appearing in
.I rfile).
If
.I rvu
was started by
.I rad,
then the
.I rfile
parameter will initially default to the rad input file used.
.TP
.BI move " [ mag [ x y z ] ]"
Move camera
.I mag
times closer to point
.I "x y z".
For a perspective projection (or fisheye view),
only the view point is changed;
the view direction and size remain constant.
The view size must be modified in a parallel projection since
it determines magnification.
If
.I "x y z"
is missing, the cursor is used to select the view center.
A negative magnification factor decreases the object size.
The default factor is one.
Care must be taken to avoid moving behind or inside other objects.
.TP
.BR new
Restart the image.
Usually used after the "set" command.
.TP
.BI pivot " angle [ elev [ mag [ x y z ] ] ]"
Similar to the "move" command, but pivots the view about a selected point.
The
.I angle
is measured in degrees around the view up vector using the right hand rule.
The optional
.I elev
is the elevation in degrees from the pivot point; positive raises the view point
to look downward and negative lowers the view point to look upward.
.TP
.BR quit
Quit the program.
.TP
.BR ^R
Redraw the image.
Use when the display gets corrupted.
On some displays, occassionally forcing a redraw can improve appearance,
as more color information is available and the driver can make a better
color table selection.
.TP
.BI rotate " angle [ elev [ mag ] ]"
Rotate the camera horizontally by
.I angle
degrees.
If an elevation is specified, the camera looks upward
.I elev
degrees.
(Negative means look downward.)
.TP
.BI set " [ var [ val ] ]"
Check/change program variable.
If
.I var
is absent, the list of available variables is displayed.
If
.I val
is absent, the current value of the variable is displayed
and changed interactively.
Otherwise, the variable
.I var
assumes the value
.I val.
Variables include:
ambient value (av),
ambient value weight (aw),
ambient bounces (ab),
ambient accuracy (aa),
ambient divisions (ad),
ambient radius (ar),
ambient samples (as),
black&white (b),
back face visibility (bv),
direct jitter (dj),
direct sampling (ds),
direct threshold (dt),
direct visibility (dv),
irradiance (i),
limit weight (lw),
limit recursion (lr),
medium extinction (me),
medium albedo (ma),
medium eccentricity (mg),
medium sampling (ms),
pixel sample (ps),
pixel threshold (pt),
specular jitter (sj),
specular threshold (st), and
uncorrelated sampling (u).
Once a variable has been changed, the "new" command can be used
to recompute the image with the new parameters.
If a program variable is not available here, it may show up under
some other command or it may be impossible to change
once the program is running.
.TP
.BI trace " [ xbeg ybeg zbeg xdir ydir zdir ]"
Trace a ray.
If the ray origin and direction are absent, the cursor is used
to pick a location in the image to trace.
The object intersected and its material, location and value are displayed.
.TP
.BI view " [ file [ comments ] ]"
Check/change view parameters.
If
.I file
is present, the view parameters are appended to a file, followed by
.I comments
if any.
Alternatively, view options may be given directly on the command line
instead of an output view file.
Otherwise, view parameters are displayed and changed interactively.
.TP
.BI V " [ vw [ rfile ] ]"
Append the current view as view
.I vw
in the rad file
.I rfile.
Compliment to
.I L
command.
Note that the view is simply appended to the file, and previous
views with the same name should be removed before using the file
with
.I rad.
.TP
.BI write " [ file ]"
Write picture to
.I file.
If argument is missing, the current file name is used.
.TP
.BR ^Z
Stop the program.
The screen will be redrawn when the program resumes.
.SH ENVIRONMENT
RAYPATH         the directories to check for auxiliary files.
DISPLAY_GAMMA           the value to use for monitor gamma correction.
.SH AUTHOR
Greg Ward
.SH "SEE ALSO"
getinfo(1), lookamb(1), oconv(1), pfilt(1), rad(1), rpict(1), rtrace(1)
Revision:	1.4
Committed:	Tue Jun 14 03:34:14 2005 UTC (18 years, 10 months ago) by greg
Branch:	MAIN
CVS Tags:	rad3R7P2, rad3R7P1, rad3R8, rad3R9
Changes since 1.3:	+5 -5 lines
Log Message:	Had to change new -R rendering option to -u to avoid conflict with rpiece
#	Content
1	.\" RCSid "$Id: rvu.1,v 1.3 2005/06/13 20:07:55 greg Exp $"
2	.TH RVU 1 1/1/04 RADIANCE
3	.SH NAME
4	rvu - generate RADIANCE images interactively
5	.SH SYNOPSIS
6	.B rvu
7	[
8	.B "rpict options"
9	][
10	.B "\-o dev"
11	][
12	.B \-b
13	][
14	.B "\-pe exposure"
15	]
16	[
17	.B $EVAR
18	]
19	[
20	.B @file
21	]
22	.B octree
23	.br
24	.B "rvu [ options ] \-defaults"
25	.br
26	.B "rvu \-devices"
27	.SH DESCRIPTION
28	.I Rvu
29	generates RADIANCE images using
30	.I octree.
31	(The octree may be given as the output of a command enclosed in quotes
32	and preceded by a `!'.)\0
33	Options specify the viewing parameters as well as
34	giving some control over the calculation.
35	Options may be given on the command line and/or read from the
36	environment and/or read from a file.
37	A command argument beginning with a dollar sign ('$') is immediately
38	replaced by the contents of the given environment variable.
39	A command argument beginning with an at sign ('@') is immediately
40	replaced by the contents of the given file.
41	The options are the same as for rpict(1), with a few notable exceptions.
42	The
43	.I "\-r, \-z, \-S, \-P, \-PP"
44	and
45	.I \-t
46	options are not supported, and
47	.I \-o
48	specifies which output device is being used instead of the output
49	file.
50	The
51	.I "\-x, \-y"
52	and
53	.I \-pa
54	options are unnecessary, since
55	.I rvu
56	scales the display image to the specified output device.
57	Additionally, the
58	.I \-b
59	option improves the display on greyscale monitors, and
60	.I \-pe
61	may be used to set an initial exposure value.
62	.PP
63	In the second form, the default values
64	for the options are printed with a brief explanation.
65	In the third form, the list of supported output devices
66	is displayed.
67	.PP
68	.I rvu
69	starts rendering the image from the selected viewpoint and
70	gradually improves the resolution of the display until
71	interrupted by keyboard input.
72	.I rvu
73	then issues a prompt (usually ':') and accepts a command
74	line from the user.
75	.I rvu
76	may also stop its calculation and wait for command input if
77	the resolution of the display has reached the resolution of the
78	graphics device.
79	At this point, it will give the 'done:' prompt and await further
80	instructions.
81	If
82	.I rvu
83	runs out of memory due to lack of resources to store its computed
84	image, it will give the 'out of memory:' prompt.
85	At this prompt, the user can save the image, quit, or even restart
86	a new image, although this is not generally recommended
87	on virtual memory machines for efficiency reasons.
88	.PP
89	.I rvu
90	is not meant to be a rendering program, and we strongly recommend that
91	.I rpict(1)
92	be used instead for that purpose.
93	Since
94	.I rpict(1)
95	does not store its image in memory or update any display of its output,
96	it is much faster and less wasteful of its resources than
97	.I rvu.
98	.I rvu
99	is intended as a quick interactive program for deciding viewpoints
100	and debugging scene descriptions and is not suited for producing
101	polished images.
102	.SH COMMANDS
103	Once the program starts, a number of commands can be used
104	to control it.
105	A command is given by its name, which can be abbreviated,
106	followed by its arguments.
107	.TP 10n
108	.BI aim " [ mag [ x y z ] ]"
109	Zoom in by
110	.I "mag"
111	on point
112	.I "x y z".
113	The view point is held constant;
114	only the view direction and size are changed.
115	If
116	.I "x y z"
117	is missing, the cursor is used to select the view center.
118	A negative magnification factor means zoom out.
119	The default factor is one.
120	.TP
121	.BR ^C
122	Interrupt.
123	Go to the command line.
124	.TP
125	.BI exposure " [ spec ]"
126	Adjust exposure.
127	The number
128	.I spec
129	is a multiplier used to compensate the average exposure.
130	A value of 1 renormalizes the image to the computed average, which
131	is usually done immediately after startup.
132	If
133	.I spec
134	begins with a '+' or '-',
135	the compensation is interpreted in f-stops (ie. the power of two).
136	If
137	.I spec
138	begins with an '=', an absolute setting is performed.
139	An '=' by itself permits interactive display and setting of the exposure.
140	If
141	.I spec
142	begins with an '@', the exposure is adjusted to present similar
143	visibility to what would be experienced in the real environment.
144	If
145	.I spec
146	is absent, or an '@' is followed by nothing, then
147	the cursor is used to pick a specific image
148	location for normalization.
149	.TP
150	.BI focus " [distance]"
151	Set focus distance for depth-of-field sampling.
152	If a distance in world coordinates is absent, then the cursor
153	is used to choose a point in the scene on which to focus.
154	(The focus distance setting does not affect rendering in
155	.I rview,
156	but can be used in
157	.I rpict
158	with the
159	.I \-pd
160	option to simulate depth-of-field on views saved from
161	.I rview.)
162	.TP
163	.BI frame " [ xmin ymin xmax ymax ]"
164	Set frame for refinement.
165	If coordinates are absent, the cursor is used to
166	pick frame boundaries.
167	If ``all'' is specified, the frame is reset to the entire image.
168	.TP
169	.BR free
170	Free cached object structures and associated data.
171	This command may be useful when memory is low and a completely
172	different view is being generated from the one previous.
173	.TP
174	.BI last " [ file ]"
175	Restore the previous view.
176	If a view or picture
177	.I file
178	is specified, the parameters are taken from the last view entry
179	in the file.
180	.TP
181	.BI L " [ vw [ rfile ] ]"
182	Load parameters for view
183	.I vw
184	from the
185	.I rad(1)
186	input file,
187	.I rfile.
188	Both
189	.I vw
190	and
191	.I rfile
192	must be given the first call, but subsequent calls will use the last
193	.I rfile
194	as a default, and "1" as the default view (ie. the first view
195	appearing in
196	.I rfile).
197	If
198	.I rvu
199	was started by
200	.I rad,
201	then the
202	.I rfile
203	parameter will initially default to the rad input file used.
204	.TP
205	.BI move " [ mag [ x y z ] ]"
206	Move camera
207	.I mag
208	times closer to point
209	.I "x y z".
210	For a perspective projection (or fisheye view),
211	only the view point is changed;
212	the view direction and size remain constant.
213	The view size must be modified in a parallel projection since
214	it determines magnification.
215	If
216	.I "x y z"
217	is missing, the cursor is used to select the view center.
218	A negative magnification factor decreases the object size.
219	The default factor is one.
220	Care must be taken to avoid moving behind or inside other objects.
221	.TP
222	.BR new
223	Restart the image.
224	Usually used after the "set" command.
225	.TP
226	.BI pivot " angle [ elev [ mag [ x y z ] ] ]"
227	Similar to the "move" command, but pivots the view about a selected point.
228	The
229	.I angle
230	is measured in degrees around the view up vector using the right hand rule.
231	The optional
232	.I elev
233	is the elevation in degrees from the pivot point; positive raises the view point
234	to look downward and negative lowers the view point to look upward.
235	.TP
236	.BR quit
237	Quit the program.
238	.TP
239	.BR ^R
240	Redraw the image.
241	Use when the display gets corrupted.
242	On some displays, occassionally forcing a redraw can improve appearance,
243	as more color information is available and the driver can make a better
244	color table selection.
245	.TP
246	.BI rotate " angle [ elev [ mag ] ]"
247	Rotate the camera horizontally by
248	.I angle
249	degrees.
250	If an elevation is specified, the camera looks upward
251	.I elev
252	degrees.
253	(Negative means look downward.)
254	.TP
255	.BI set " [ var [ val ] ]"
256	Check/change program variable.
257	If
258	.I var
259	is absent, the list of available variables is displayed.
260	If
261	.I val
262	is absent, the current value of the variable is displayed
263	and changed interactively.
264	Otherwise, the variable
265	.I var
266	assumes the value
267	.I val.
268	Variables include:
269	ambient value (av),
270	ambient value weight (aw),
271	ambient bounces (ab),
272	ambient accuracy (aa),
273	ambient divisions (ad),
274	ambient radius (ar),
275	ambient samples (as),
276	black&white (b),
277	back face visibility (bv),
278	direct jitter (dj),
279	direct sampling (ds),
280	direct threshold (dt),
281	direct visibility (dv),
282	irradiance (i),
283	limit weight (lw),
284	limit recursion (lr),
285	medium extinction (me),
286	medium albedo (ma),
287	medium eccentricity (mg),
288	medium sampling (ms),
289	pixel sample (ps),
290	pixel threshold (pt),
291	specular jitter (sj),
292	specular threshold (st), and
293	uncorrelated sampling (u).
294	Once a variable has been changed, the "new" command can be used
295	to recompute the image with the new parameters.
296	If a program variable is not available here, it may show up under
297	some other command or it may be impossible to change
298	once the program is running.
299	.TP
300	.BI trace " [ xbeg ybeg zbeg xdir ydir zdir ]"
301	Trace a ray.
302	If the ray origin and direction are absent, the cursor is used
303	to pick a location in the image to trace.
304	The object intersected and its material, location and value are displayed.
305	.TP
306	.BI view " [ file [ comments ] ]"
307	Check/change view parameters.
308	If
309	.I file
310	is present, the view parameters are appended to a file, followed by
311	.I comments
312	if any.
313	Alternatively, view options may be given directly on the command line
314	instead of an output view file.
315	Otherwise, view parameters are displayed and changed interactively.
316	.TP
317	.BI V " [ vw [ rfile ] ]"
318	Append the current view as view
319	.I vw
320	in the rad file
321	.I rfile.
322	Compliment to
323	.I L
324	command.
325	Note that the view is simply appended to the file, and previous
326	views with the same name should be removed before using the file
327	with
328	.I rad.
329	.TP
330	.BI write " [ file ]"
331	Write picture to
332	.I file.
333	If argument is missing, the current file name is used.
334	.TP
335	.BR ^Z
336	Stop the program.
337	The screen will be redrawn when the program resumes.
338	.SH ENVIRONMENT
339	RAYPATH the directories to check for auxiliary files.
340	DISPLAY_GAMMA the value to use for monitor gamma correction.
341	.SH AUTHOR
342	Greg Ward
343	.SH "SEE ALSO"
344	getinfo(1), lookamb(1), oconv(1), pfilt(1), rad(1), rpict(1), rtrace(1)