man/man1/rvu.1

.\" RCSid "$Id: rvu.1,v 1.11 2017/08/13 20:11:04 greg Exp $"
.TH RVU 1 1/1/04 RADIANCE
.SH NAME
rvu - generate RADIANCE images interactively
.SH SYNOPSIS
.B rvu
[
.B "rpict options"
][
.B "\-n nproc"
][
.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 "\-pd, \-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
The
.I \-n
option may be used to specify multiple processes,
to accelerate rendering.
.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 rvu,
but can be used in
.I rpict
with the
.I \-pd
option to simulate depth-of-field on views saved from
.I rvu.)
.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
.I 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
.BI new " [ nproc ]"
Restart the image, using the specified number of rendering processes.
Usually used after the "set" command.
.TP
.BI origin " [ xo yo zo [ xd yd zd ] ]"
Change view origin to the indicated world position
.I "xo yo zo"
looking in the direction
.I "xd yd zd."
If the direction is missing, the current view direction is used.
If the origin is missing, the cursor is used to select the
view origin, and the direction will be determined by the
(reoriented) surface normal.
The view type and size will not be altered, but the up vector
may be changed if the new direction coincides.
.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,
so a positive value pivots the viewer to the right of the selected point.
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 using the right-hand rule.
A positive value rotates the view towards the left, and a negative value
looks to the right.
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.
.br
DISPLAY_GAMMA           the value to use for monitor gamma correction.
.SH AUTHOR
Greg Ward
.SH "SEE ALSO"
getinfo(1), lookamb(1), mkpmap(1),
oconv(1), pfilt(1), rad(1), rpict(1), rtpict(1), rtrace(1)
Revision:	1.12
Committed:	Tue Mar 20 02:40:38 2018 UTC (7 years, 1 month ago) by greg
Branch:	MAIN
Changes since 1.11:	+2 -2 lines
Log Message:	Wrote rtpict program to run rpict as if it had a -n option
#	User	Rev	Content
1	greg	1.12	.\" RCSid "$Id: rvu.1,v 1.11 2017/08/13 20:11:04 greg Exp $"
2	greg	1.1	.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	greg	1.5	.B "\-n nproc"
11			][
12	greg	1.1	.B "\-o dev"
13			][
14			.B \-b
15			][
16			.B "\-pe exposure"
17			]
18			[
19			.B $EVAR
20			]
21			[
22			.B @file
23			]
24			.B octree
25			.br
26			.B "rvu [ options ] \-defaults"
27			.br
28			.B "rvu \-devices"
29			.SH DESCRIPTION
30			.I Rvu
31			generates RADIANCE images using
32			.I octree.
33			(The octree may be given as the output of a command enclosed in quotes
34			and preceded by a `!'.)\0
35			Options specify the viewing parameters as well as
36			giving some control over the calculation.
37			Options may be given on the command line and/or read from the
38			environment and/or read from a file.
39			A command argument beginning with a dollar sign ('$') is immediately
40			replaced by the contents of the given environment variable.
41			A command argument beginning with an at sign ('@') is immediately
42			replaced by the contents of the given file.
43			The options are the same as for rpict(1), with a few notable exceptions.
44			The
45	greg	1.9	.I "\-pd, \-r, \-z, \-S, \-P, \-PP"
46	greg	1.1	and
47			.I \-t
48			options are not supported, and
49			.I \-o
50			specifies which output device is being used instead of the output
51			file.
52			The
53			.I "\-x, \-y"
54			and
55			.I \-pa
56			options are unnecessary, since
57			.I rvu
58			scales the display image to the specified output device.
59			Additionally, the
60			.I \-b
61			option improves the display on greyscale monitors, and
62			.I \-pe
63			may be used to set an initial exposure value.
64			.PP
65	greg	1.5	The
66			.I \-n
67			option may be used to specify multiple processes,
68			to accelerate rendering.
69			.PP
70	greg	1.1	In the second form, the default values
71			for the options are printed with a brief explanation.
72			In the third form, the list of supported output devices
73			is displayed.
74			.PP
75			.I rvu
76			starts rendering the image from the selected viewpoint and
77			gradually improves the resolution of the display until
78			interrupted by keyboard input.
79			.I rvu
80			then issues a prompt (usually ':') and accepts a command
81			line from the user.
82			.I rvu
83			may also stop its calculation and wait for command input if
84			the resolution of the display has reached the resolution of the
85			graphics device.
86			At this point, it will give the 'done:' prompt and await further
87			instructions.
88			If
89			.I rvu
90			runs out of memory due to lack of resources to store its computed
91			image, it will give the 'out of memory:' prompt.
92			At this prompt, the user can save the image, quit, or even restart
93			a new image, although this is not generally recommended
94			on virtual memory machines for efficiency reasons.
95			.PP
96			.I rvu
97			is not meant to be a rendering program, and we strongly recommend that
98			.I rpict(1)
99			be used instead for that purpose.
100			Since
101			.I rpict(1)
102			does not store its image in memory or update any display of its output,
103			it is much faster and less wasteful of its resources than
104			.I rvu.
105			.I rvu
106			is intended as a quick interactive program for deciding viewpoints
107			and debugging scene descriptions and is not suited for producing
108			polished images.
109			.SH COMMANDS
110			Once the program starts, a number of commands can be used
111			to control it.
112			A command is given by its name, which can be abbreviated,
113			followed by its arguments.
114			.TP 10n
115			.BI aim " [ mag [ x y z ] ]"
116			Zoom in by
117			.I "mag"
118			on point
119			.I "x y z".
120			The view point is held constant;
121			only the view direction and size are changed.
122			If
123			.I "x y z"
124			is missing, the cursor is used to select the view center.
125			A negative magnification factor means zoom out.
126			The default factor is one.
127			.TP
128			.BR ^C
129			Interrupt.
130			Go to the command line.
131			.TP
132			.BI exposure " [ spec ]"
133			Adjust exposure.
134			The number
135			.I spec
136			is a multiplier used to compensate the average exposure.
137			A value of 1 renormalizes the image to the computed average, which
138			is usually done immediately after startup.
139			If
140			.I spec
141			begins with a '+' or '-',
142			the compensation is interpreted in f-stops (ie. the power of two).
143			If
144			.I spec
145			begins with an '=', an absolute setting is performed.
146			An '=' by itself permits interactive display and setting of the exposure.
147			If
148			.I spec
149			begins with an '@', the exposure is adjusted to present similar
150			visibility to what would be experienced in the real environment.
151			If
152			.I spec
153			is absent, or an '@' is followed by nothing, then
154			the cursor is used to pick a specific image
155			location for normalization.
156			.TP
157	greg	1.2	.BI focus " [distance]"
158			Set focus distance for depth-of-field sampling.
159			If a distance in world coordinates is absent, then the cursor
160			is used to choose a point in the scene on which to focus.
161			(The focus distance setting does not affect rendering in
162	greg	1.6	.I rvu,
163	greg	1.2	but can be used in
164			.I rpict
165			with the
166			.I \-pd
167			option to simulate depth-of-field on views saved from
168	greg	1.6	.I rvu.)
169	greg	1.2	.TP
170	greg	1.1	.BI frame " [ xmin ymin xmax ymax ]"
171			Set frame for refinement.
172			If coordinates are absent, the cursor is used to
173			pick frame boundaries.
174			If ``all'' is specified, the frame is reset to the entire image.
175			.TP
176			.BR free
177			Free cached object structures and associated data.
178			This command may be useful when memory is low and a completely
179			different view is being generated from the one previous.
180			.TP
181			.BI last " [ file ]"
182			Restore the previous view.
183			If a view or picture
184			.I file
185			is specified, the parameters are taken from the last view entry
186			in the file.
187			.TP
188			.BI L " [ vw [ rfile ] ]"
189			Load parameters for view
190			.I vw
191			from the
192			.I rad(1)
193			input file,
194			.I rfile.
195			Both
196			.I vw
197			and
198			.I rfile
199			must be given the first call, but subsequent calls will use the last
200			.I rfile
201			as a default, and "1" as the default view (ie. the first view
202			appearing in
203			.I rfile).
204			If
205			.I rvu
206			was started by
207			.I rad,
208			then the
209			.I rfile
210	greg	1.11	parameter will initially default to the
211			.I rad
212			input file used.
213	greg	1.1	.TP
214			.BI move " [ mag [ x y z ] ]"
215			Move camera
216			.I mag
217			times closer to point
218			.I "x y z".
219			For a perspective projection (or fisheye view),
220			only the view point is changed;
221			the view direction and size remain constant.
222			The view size must be modified in a parallel projection since
223			it determines magnification.
224			If
225			.I "x y z"
226			is missing, the cursor is used to select the view center.
227			A negative magnification factor decreases the object size.
228			The default factor is one.
229			Care must be taken to avoid moving behind or inside other objects.
230			.TP
231	greg	1.5	.BI new " [ nproc ]"
232			Restart the image, using the specified number of rendering processes.
233	greg	1.1	Usually used after the "set" command.
234			.TP
235	greg	1.6	.BI origin " [ xo yo zo [ xd yd zd ] ]"
236			Change view origin to the indicated world position
237			.I "xo yo zo"
238			looking in the direction
239			.I "xd yd zd."
240			If the direction is missing, the current view direction is used.
241			If the origin is missing, the cursor is used to select the
242			view origin, and the direction will be determined by the
243			(reoriented) surface normal.
244			The view type and size will not be altered, but the up vector
245			may be changed if the new direction coincides.
246			.TP
247	greg	1.1	.BI pivot " angle [ elev [ mag [ x y z ] ] ]"
248			Similar to the "move" command, but pivots the view about a selected point.
249			The
250			.I angle
251	greg	1.8	is measured in degrees around the view up vector using the right hand rule,
252			so a positive value pivots the viewer to the right of the selected point.
253	greg	1.1	The optional
254			.I elev
255			is the elevation in degrees from the pivot point; positive raises the view point
256			to look downward and negative lowers the view point to look upward.
257			.TP
258			.BR quit
259			Quit the program.
260			.TP
261			.BR ^R
262			Redraw the image.
263			Use when the display gets corrupted.
264			On some displays, occassionally forcing a redraw can improve appearance,
265			as more color information is available and the driver can make a better
266			color table selection.
267			.TP
268			.BI rotate " angle [ elev [ mag ] ]"
269			Rotate the camera horizontally by
270			.I angle
271	greg	1.8	degrees using the right-hand rule.
272			A positive value rotates the view towards the left, and a negative value
273			looks to the right.
274	greg	1.1	If an elevation is specified, the camera looks upward
275			.I elev
276			degrees.
277			(Negative means look downward.)
278			.TP
279			.BI set " [ var [ val ] ]"
280			Check/change program variable.
281			If
282			.I var
283			is absent, the list of available variables is displayed.
284			If
285			.I val
286			is absent, the current value of the variable is displayed
287			and changed interactively.
288			Otherwise, the variable
289			.I var
290			assumes the value
291			.I val.
292			Variables include:
293			ambient value (av),
294			ambient value weight (aw),
295			ambient bounces (ab),
296			ambient accuracy (aa),
297			ambient divisions (ad),
298			ambient radius (ar),
299			ambient samples (as),
300			black&white (b),
301	greg	1.4	back face visibility (bv),
302	greg	1.1	direct jitter (dj),
303			direct sampling (ds),
304			direct threshold (dt),
305			direct visibility (dv),
306			irradiance (i),
307			limit weight (lw),
308			limit recursion (lr),
309			medium extinction (me),
310			medium albedo (ma),
311			medium eccentricity (mg),
312			medium sampling (ms),
313			pixel sample (ps),
314			pixel threshold (pt),
315	greg	1.4	specular jitter (sj),
316			specular threshold (st), and
317			uncorrelated sampling (u).
318	greg	1.1	Once a variable has been changed, the "new" command can be used
319			to recompute the image with the new parameters.
320			If a program variable is not available here, it may show up under
321			some other command or it may be impossible to change
322			once the program is running.
323			.TP
324			.BI trace " [ xbeg ybeg zbeg xdir ydir zdir ]"
325			Trace a ray.
326			If the ray origin and direction are absent, the cursor is used
327			to pick a location in the image to trace.
328			The object intersected and its material, location and value are displayed.
329			.TP
330			.BI view " [ file [ comments ] ]"
331			Check/change view parameters.
332			If
333			.I file
334			is present, the view parameters are appended to a file, followed by
335			.I comments
336			if any.
337			Alternatively, view options may be given directly on the command line
338			instead of an output view file.
339			Otherwise, view parameters are displayed and changed interactively.
340			.TP
341			.BI V " [ vw [ rfile ] ]"
342			Append the current view as view
343			.I vw
344			in the rad file
345			.I rfile.
346			Compliment to
347			.I L
348			command.
349			Note that the view is simply appended to the file, and previous
350			views with the same name should be removed before using the file
351			with
352			.I rad.
353			.TP
354			.BI write " [ file ]"
355			Write picture to
356			.I file.
357			If argument is missing, the current file name is used.
358			.TP
359			.BR ^Z
360			Stop the program.
361			The screen will be redrawn when the program resumes.
362			.SH ENVIRONMENT
363			RAYPATH the directories to check for auxiliary files.
364	greg	1.7	.br
365	greg	1.1	DISPLAY_GAMMA the value to use for monitor gamma correction.
366			.SH AUTHOR
367			Greg Ward
368			.SH "SEE ALSO"
369	greg	1.10	getinfo(1), lookamb(1), mkpmap(1),
370	greg	1.12	oconv(1), pfilt(1), rad(1), rpict(1), rtpict(1), rtrace(1)