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YouTube instructions for the browser version. (Read 3135 times)
Tony
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YouTube instructions for the browser version.
11/01/15 at 18:34:45
 
https://www.youtube.com/watch?v=oeiv0rCKBD8
This 13-minute vid will step you through the basics.
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frankuitaalst
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Re: YouTube instructions for the browser version.
Reply #1 - 11/02/15 at 13:34:22
 
Hi Tony , thanks for the instructions on youtube .  
Is it also possible to provide the text of the instructions in text format , fi. here ?  
Facilitates the reading and quick search .
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Re: YouTube instructions for the browser version.
Reply #2 - 11/02/15 at 17:22:35
 
Opening the Simulator and getting
a basic feel for the program.

 
1.      Open Gravity Simulator by clicking
     on the link provided  
     in the description.
 
2.      Play with the slider controls  
     on the Camera A interface.  
     Get a feel for what they do.
 
3.      Run the simulation by pressing
     the Play button [>].
 
4.      Turn the checkboxes on and off.
     Get a feeling for what they do.
 
     "Kepler" plots pre-determined
     Keplerian orbits.  Objects can be
     perturbed from their true Keplerian
     orbits.  "Trails" traces their paths in
     real time.
 
5.      Play with the Time Step control.
     If you exceed 16384, the  
     solar system will begin to fall apart!
     More on this later.
     Pressing [>>] causes the simulation
     to run backwards.
 
Rotating Frame
 
6.      Play with the Rotating Frame  
     feature.      This keeps the selected
     planet stationary on the screen.
 
7.      Adding longitude to the planet
     changes its position.
 
8.      The planets deviate a bit from their
     average positions.  True longitude
     prevents them from drifting along
     their orbits.  Mean longitude  
     allows them to drift.
 
 
More Display Controls
9.      Refresh the browser to return
     to the starting conditions.
 
10.      Press "A" on your keyboard.
     This opens the "Frame A" interface
     and gives you more control over
     the display.
 
11.      Choose Earth as "Target Object A"
       and Mars as "Camera Object A".
     
12.      Turn off Keplerian Trails by
     unchecking either "Kepler"
     or "Pre trails".
 
13.      Turn off "Axes".
 
14.      Zoom in to 512000.
     
15.      Slow the time step to 128.
 
16.      Earth and Moon are both
     exaggerated in size.  
 
     Change the Minimum object size
     to 1.
 
18.      Press Play [>] or press "P"  
     on the keyboard.
 
17.      You can change the thickness of
     the trails too.  Turn on the "Trails".
 
     Change the Trail size to 0.5,
     and check or uncheck  
     the "Trails" box depending  
     on your preference.
 
19.      Check the "Barycenter box"
     to cause the system to orbit
     the Earth / Moon barycenter.
 
20.      Check or uncheck the "Phases" box
     to cause the objects to display
     circles or phases.
 
21.      Refresh the browser to return
     to the starting conditions.
 
22.      Press "A" for the "Frame A"
     interface.
 
23.      Use the bottom slider to zoom in.
 
24.      Check and uncheck the  
     "Sun graphic" box to get a feel for
     what it does.
 
25.      Use the bottom slider to zoom
     out as far as you can.
 
26.      Check and uncheck "Static KBOs"
     to get a feel for what it does.
 
     Static KBOs do not move.
     They are there only for decoration.
     The longer you keep the box
     checked, the brighter they become.
 
27.      Press "C" to make them disappear.
 
 
Field of View
 
28.      As you have seen, there are 2 ways
     to control the apparent size
     of the screen:
 
29.      The bottom slider and
     the Zoom buttons on the
     "Frame A" interface.
 
30.      The bottom slider controls the
     distance of the camera to the
     target object.  Getting close
     will give you a fisheye effect.
 
31.      The Zoom simply magnifies  
     the view.
 
Adjusting the view
 
32.      Choose Mars as "Target Object A"
     and Earth as "Camera Object A".
 
     Turn off "Axes" and "Kepler" boxes.
 
     Since "Camera Object A" is not set
     to "Camera A", the sliders will
     have no effect.  You can hide them
     if you like.
 
33.      Zoom out to 1000.
 
34.      Press "M" on your keyboard to
     to display the Menu.  If you wish
     to hide it, press "M" again.
 
35.      Under the "Display" menu,
     choose "Stars".
 
     Under "Star Catalog" choose "520".
 
     Set "Star brightness" to 50.
 
     Press Play [>] to view Mars moving
     against the background stars.
 
     If your computer is fast enough
     to handle it, choose 15k stars.
 
36.      Refresh the browser to return
     to the starting conditions.
 
37.      Press "L" for labels, or use the
     checkbox.
 
38.      Use the bottom slider bar to
     move in until the orbit of Jupiter
     fills the screen.
 
 
 
Importing objects.
 
39.      Press "I" for import.
     (or press M for menu, and choose
       import from the objects menu)
 
40.      2015 SO2 is a newly-discovered
     asteroid that is probably
     co-orbital with Earth.
 
     Type "2015 SO2".
     The space between "2015" and
     "SO" is important.
     The character "0" in "S02" is  
     the letter "0", not the digit zero.
     Use only capital letters.
 
41.      Choose a color.
 
42.      Press Import.
     The program now contacts
     JPL Horizons for position and
     velocity data for the asteroid
     and imports it into the simulation.
 
43.      Press Play [>] on the Time Step
     (or "P" on your keyboard).
 
44.      Since this asteroid is co-orbital with
     Earth, hold Earth stationary by
     choosing it from the dropdown list.
 
45.      Turn off Axes and turn on "Trails".
 
46.      Adjust the middle slider for a
     "top-down" view.
 
47.      If desired, turn off the pre-drawn
     orbits by unchecking "Kepler".
 
Additional Calendars
 
48.      Astronomers like to use UTC.
     But you may prefer your own
     local time zone.
 
49.      Press "M" to show the menu.
     Under the "Time" menu, choose
     "Calendar Date (local)".
 
50.      You may also display the Julian Day.
     Under the "Time" menu, choose
     Julian Day.
 
 
That's enough to get you started.
Watch more videos in this series.
 
Learn how to
⦁      Save simulations
⦁      Edit objects
⦁      Add objects from scratch
⦁      Add objects with clones
⦁      Enable collisions between objects
⦁      Take screen shots
⦁      Compare integration methods
⦁      Use variable step  
     integration methods
⦁      View the sky from different cities
⦁      Use Autopilot to control  
     the flow of the simulation.
⦁      Output data to a spreadsheet
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frankuitaalst
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Re: YouTube instructions for the browser version.
Reply #3 - 11/05/15 at 10:04:25
 
Hi Tony ,
Thanks for the introduction .  
I have a question about inputting in the edit boxes , fi. in the create new .  
I get weird results if fi. I input a 5,2 as Sma .  
Should I input a 5.2 instead ?  
( comma versus decimal point issue )
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Tony
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Re: YouTube instructions for the browser version.
Reply #4 - 11/05/15 at 12:39:27
 
The program simply takes the string that is input into that box and converts it to a number.  I don't know how the browsers handle computers with European settings.  Have you tried it both ways?  Does 5.2 work?
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frankuitaalst
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Re: YouTube instructions for the browser version.
Reply #5 - 11/05/15 at 14:42:57
 
Yep , 5.2 works .  Altough I taught I once had to input with komma . I'll pay attention in the future.
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frankuitaalst
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Re: YouTube instructions for the browser version.
Reply #6 - 11/06/15 at 13:00:14
 
Some help needed :
I want to create a Jup Sized planet in our solar system : 5.2 Au ; 0.02 Ecc ; 1 incl at MA =0.  
This works .  
I then add a Trojan , want to get it at MA = 60 .  
This doesn't seem to work . Both created bodies are very close to each other and fly away.  
Same occurs when I add a trailing trojan at MA =300 .  
Any idea what I do wrong here ?
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frankuitaalst
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Re: YouTube instructions for the browser version.
Reply #7 - 11/06/15 at 15:01:16
 
Suprisingly the above setup succeeds in the .exe version of GravSim , see annex.  
I increased the Jupiter masses by factor 2 and even aded an Earth at 0.05 AU around one trojan .
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Tony
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Re: YouTube instructions for the browser version.
Reply #8 - 11/06/15 at 15:01:30
 
make sure you start with the link from the YouTube video:
http://orbitsimulator.com/gravitySimulatorCloud/simulations/gsim20151018.html
 
There was a bug in an older version that caused problems like the one you described.
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