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<H2><A NAME="s3">3.</A> <A HREF="partiview.html#toc3">Running the program</A></H2>
<P>First we describe a simple example how to run <CODE>partiview</CODE> with a supplied sample
dataset. Then we describe the different windows that <CODE>partiview</CODE> is made up of, and
the different commands and keystrokes it listens to.</P>
<H2><A NAME="ss3.1">3.1</A> <A HREF="partiview.html#toc3.1">Example 1: Hipparcos Bright Star Catalogue 3-D viewing</A>
<P>Start the program using one of the sample "speck" files in the
<CODE>data</CODE> directory:</P>
<P>and this should come up with a display familiar to most of us who
watch the skies. You should probably enlarge the
window a bit. Mine comes up in roughly a 300 by 300 display window,
which may be a bit small (certainly on my screen :-)
(Hint: the <CODE>.partiviewrc</CODE> file may contain commands like
<CODE>eval winsize 600 400</CODE>.)</P>
<P>Hit the TAB key to bring focus to the (one line) command window inbetween
the log screen (top) and viewing screen (bottom). Type the commands</P>
<P>
<BLOCKQUOTE><CODE>
<HR>
<PRE>
fov 50 (field of view 50 degrees)
jump 0 0 0 80 70 60 (put yourself in the origin
<P>and it should give another nice comfy view :-) If you ever get lost,
and this is not hard, use
the <CODE>jump</CODE> command to go back to a known position and/or viewing
angle.</P>
<P>
<FIGURE>
<IMG SRC="pv1.gif">
<CAPTION>partiview view</CAPTION>
</FIGURE>
</P>
<P>Note that spatial units for this dataset are
parsecs, though angular units are degrees for any data in partiview.</P>
<P>Now play with the display, use the 't', 'r', 'f' and 'o' keys
(keys are case sensitive) in the viewing window and use the
left and mouse buttons down to (carefully) move around a bit, and make
yourself comfortable with moving around. Using the 't' button you get
some idea of the distance of the stars by moving back and forth a little
(the parallax trick). In fact, if you 't' around a little bit, you may
see a green line flashing through the display. This is one of the RGB
(xyz) axes attached to the (0,0,0) [our sun] position. You should see
Procyon and Sirius exhibit pretty large parallaxes, but Orion is pretty
steady since it is several hundred parsecs away.
If you move the right mouse button you will zoom in/out and
should see our Sun flash by with the red-green-blue axes.</P>
<P>The RGB axes represent the XYZ axes in a (right-handed)
cartesian system. For the Hipparcos
data the X (red) axis points to RA=0h, Y (green) axis to RA=6h, both in the equatorial
plane, and the Z (blue) axis points to the equatorial north pole.</P>
<P>Try and use the middle mouse button (or the 'p' key) to click on Sirius
or Procyon, and see if you can get it to view its properties. Now use
the 'P' key to switch center to rotation to that star. Sirius is
probably a good choice. Move around a bit, and try and get the sun and orion
in the same view :-)</P>
<P>[NOTE: these Hipparcos data do not have reliably distance above
100-200 pc, so Orion's individual distances are probably uncertain to 30%]</P>
<P>A little bit on the types of motion, and what the mouse buttons do</P>
<P>
<BLOCKQUOTE><CODE>
<HR>
<PRE>
| left middle right
| Button-1 Button-2 Button-3 Shift Button-1
------------------------------------------------------------------------------------
r (rotate) | rotate X/Y 'pick' rotate Z translate
t (translate) | translate 'pick' zoom
</PRE>
<HR>
</CODE></BLOCKQUOTE>
</P>
<P>The point of origin for rotations can be changed with the 'P' button.
First you can try and pick ('p' or Button-2) a point, and if found,
hit 'P' to make this point the new rotation center default.</P>
<P>
<BLOCKQUOTE><CODE>
<HR>
<PRE>
red = X axis
green = Y axis
blue = Z axis
</PRE>
<HR>
</CODE></BLOCKQUOTE>
</P>
<P>To choose an arbitrary center of rotation, use the <CODE>center</CODE> command.</P>
<H2><A NAME="ss3.2">3.2</A> <A HREF="partiview.html#toc3.2">Top Row</A>
<P>The top row contains some shortcuts to some frequently used commands.
From left to right, it should show the following buttons:</P>
<DT><B> More </B><DD>
<P>Offers some mode switches as toggles: <CODE>inertia</CODE>
for continues spin or motion,
and an <CODE>H-R Diagram</CODE> to invoke a separate H-R diagram window
for datasets that support stellar evolution.</P>
<DT><B> [g1] </B><DD>
<P>Pulldown g1, g2, ... (or whichever group)
is the currently selected group. See <CODE>object</CODE> command
to make aliases which group is defined to what object. If multiple
groups are defined, the next row below this contains a list of all
the groups, and their aliases, so you can toggle them to be displayed.</P>
<DT><B> [f]ly </B><DD>
<P>Pulldown to select fly/orbit/rot/tran, which can also be activate
by pressing the f/o/r/t keys inside the viewing window.</P>
<DT><B> point </B><DD>
<P>Toggle to turn the points on/off. See also the <CODE>points</CODE> command.</P>
<DT><B> poly </B><DD>
<P>Toggle to turn polygons on/off. See also the <CODE>polygon</CODE> command.</P>
<DT><B> lbl </B><DD>
<P>Toggle to turn labels on/off. See also the <CODE>label</CODE> command.</P>
<DT><B> tex </B><DD>
<P>Toggle to turn textures on/off. See also the <CODE>texture</CODE> command.</P>
<DT><B> box </B><DD>
<P>Toggle to turn boxes on/off. See also the <CODE>boxes</CODE> command.</P>
<DT><B> #.### </B><DD>
<P>The current displayed value of the <CODE>logslum lum</CODE> slider (see next)</P>
<DT><B> logslum lum </B><DD>
<P>Slider controlling the logarithm of the <B>datavar</B> variable
selected as luminosity (with the <CODE>lum</CODE> command).</P>
</P>
<H2><A NAME="ss3.3">3.3</A> <A HREF="partiview.html#toc3.3">Group row (optional)</A>
</H2>
<P>When more than one group has been activated (groups of particles or objects
can have their own display properties, and be turned on and off at will),
a new Group Row will appear as the 2nd row.</P>
<P>Left-clicking (button 1) on a button toggles the display of that group;
right-clicking (button 3) enables display of the group,
and also selects it as the current group for GUI controls and
text commands.</P>
<H2><A NAME="ss3.4">3.4</A> <A HREF="partiview.html#toc3.4">Time Animation rows (Optional)</A>
<P>For time-dependent data, the third and fourth row from
the top control the currently displayed data-time.
This time-control bar is only visible when the object
has a nonzero time range.</P>
<DT><B> T </B><DD>
<P>Shows the current time (or offset from the tripmeter).
The absolute time is the sum of the <B>T</B> and <B>+</B> fields.
Both are editable.
See also the <CODE>step</CODE> control command.</P>
<DT><B>trip </B><DD>
<P>Press to mark a reference point in time.
The T field becomes zero, and the + field (below)
is set to current time. As time passes, T shows the
offset from this reference time.</P>
<DT><B>back </B><DD>
<P>Press to return to reference time (sets T to 0).</P>
<DT><B> + </B><DD>
<P>Current last time where tripmeter was set. You can reset to
the first frame with the command <CODE>step 0</CODE></P>
<DT><B> dial </B><DD>
<P>Drag to adjust the current time. Sensitivity depends
on the speed setting; dragging by one dial-width
corresponds to 0.1 wall-clock second of animation,
i.e. 0.1 * <I>speed</I> in data time units.</P>
<DT><B> |< </B><DD>
<DT><B> >| </B><DD>
<P>Step time backwards or forwards by 0.1 * <I>speed</I> data time units.
See also the <CODE><</CODE> and <CODE>></CODE> keyboard shortcuts.</P>
<DT><B> << </B><DD>
<DT><B> >> </B><DD>
<P>toggle movie move forwards in time
Toggle animating backwards or forwards in time, by
1 * <I>speed</I> data time units per real-time second.
See also the <CODE>{</CODE>, <CODE>~</CODE>, and <CODE>}</CODE> keyboard shortcuts.</P>
<DT><B> #.#### </B><DD>
<P>(Logarithmic) value denoting <I>speed</I> of animation.
See also the <CODE>speed</CODE> control command.</P>
</P>
<H2><A NAME="ss3.5">3.5</A> <A HREF="partiview.html#toc3.5">Camera (path) Animation row</A>
<P>The fifth (or 4th or 3rd, depending if Group and/or Time rows are present)
row from the top controls loading and playing sequences of moving through space.</P>
<DT><B> Path... </B><DD>
<P>Brings up a filebrowser to load a <B>.wf</B> path file. This is a file with on each
line 7 numbers: xyz location, RxRyRz viewing direction, and FOV (field of view).
The <CODE>rdata</CODE> command loads such path files too.</P>
<DT><B> Play </B><DD>
<P>Play the viewpoint along the currently loaded path,
as the <CODE>play</CODE> command does.
Right-click for a menu of play-speed options.</P>
<DT><B> << < [###] >>> </B><DD>
<P>Step through camera-path frames.
See also <CODE>frame</CODE> control command.</P>
<DT><B> slider </B><DD>
<P>Slides through camera path, and displays current frame.</P>
</P>
<H2><A NAME="ss3.6">3.6</A> <A HREF="partiview.html#toc3.6">Logfile window</A>
<P>The third window from the top contains a logfile of past commands
and responses to them, and can be resized by dragging the bar between
command window and viewing window.
The Logfile window also has a scroll bar on the left. You can
direct the mouse to any previous command, and it will show up in the
command window. Using the arrow keys this command can then be edited.</P>
<H2><A NAME="ss3.7">3.7</A> <A HREF="partiview.html#toc3.7">Command window</A>
<P>The Command window is a single line entry window, in which Control
Commands can be given. Their responses appear in the Logfile
window and on the originating console. (unlike Data Commands,
which show no feedback). You can still give Data Commands in
this window by prefixing them with the <CODE>add</CODE> command.
The Up- and Down-arrow keys (not those on the keypad) scroll through
previous commands, and can be edited using the arrow keys and a subset
of the emacs control characters.</P>
<H2><A NAME="ss3.8">3.8</A> <A HREF="partiview.html#toc3.8">Viewing window</A>
<P>The (OpenGL) Viewing window is where all the action occurs. Typically
this is where you give single keystroke commands and/or move the mouse
for an interactive view of the data. It can be resized two ways:
either by resizing the master window, or by picking up the separator
between Viewing window and Command window above.</P>
<H2><A NAME="ss3.9">3.9</A> <A HREF="partiview.html#toc3.9">Example 2: a (starlab) animation</A>
</H2>
<P>Setting up a small animation in for example Starlab can be done quite simply as follows:
(see also the primbim16.mk makefile to create a standard one):</P>
<P>
<BLOCKQUOTE><CODE>
<HR>
<PRE>
% makeplummer -i -n 20 | makemass -l 0.5 -u 10.0 | scale -s | kira -d 2 -D x10 > run1
% partiview run1.cf
% cat run1.cf
kira run1
eval every
eval lum mass 0 0.01
eval psize 100
eval cment 1 1 .7 .3
eval color clump exact
</PRE>
<HR>
</CODE></BLOCKQUOTE>
</P>
<P>Alternatively, if you had started up partiview without any arguments, the following
Control Command (see below) would have done the same</P>
<P>
<BLOCKQUOTE><CODE>
<HR>
<PRE>
read run1.cf
</PRE>
<HR>
</CODE></BLOCKQUOTE>
</P>
<H2><A NAME="ss3.10">3.10</A> <A HREF="partiview.html#toc3.10">Example 3: stereo viewing </A>
</H2>
<P>The 's' key within the viewing window toggles stereo viewing. By default each
object is split in a blue and a red part, that should be viewed with a pair
of red(left)/blue(right) glasses. Red/green glasses will probably work too.
Crosseyed viewing is also available if selected by <B>stereo cross</B>.
See <B>stereo</B> and <B>focallen</B> in the View Commands section. </P>
<H2><A NAME="ss3.11">3.11</A> <A HREF="partiview.html#toc3.11">Example 4: subsetting</A>
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</H2>
<P>In the <CODE>data</CODE> directory, run
<PRE>
partiview hip.cf
</PRE>
One of the data fields for these stars is the <I>B-V</I> color, <CODE>colorb_v</CODE>,
abbreviatable to just <CODE>color</CODE>. Look at just the bluest stars: try
<PRE>
thresh color < -.1
</PRE>
Back off to a large distance (drag with right mouse button,
and drag the <CODE>logslum lum</CODE> slider to brighten)
and look at the distribution of these blue stars. The
Orion spiral-arm spur, extending generally along the +Y (green)
axis, has lots of them. Now look at more reddish stars,
those with .5 <= <I>B-V</I> <= 1.5, with:
<PRE>
thresh color .5 1.5
</PRE>
These are much more uniformly distributed in the galactic plane.
Return to seeing all stars, with:
<PRE>
see all
</PRE>
or re-view the threshold-selected subset (reddish stars) with
<PRE>
see thresh
</PRE>
or its complement with
<PRE>
see -thresh
</PRE>
</P>