Physics of Angry Birds and Bad Piggies
  • mvnla2mvnla2
  • 30 Comments
  • gfishgfish
    Well, I was wondering if a bird could get stuck in an orbit around an astreroid.
  • AMslimfordyAMslimfordy
    @gfish: no, the gravitational pull is sufficient to eventually land a projectile.
  • ladycrumbladycrumb
    In a multi-body system a bird, uh, a small body, might be loosely captured in orbit for a short time and later either escaping or crashing down on the larger body or some other body. I would be surprised if this shows up in the game however; we'll see birds crashing or simply flying by the asteroids.

    (A real world example here: http://en.wikipedia.org/wiki/J002E3 with a fantastic animation here: http://en.wikipedia.org/wiki/File:J002e3f_orbit.gif)
  • mvnla2mvnla2
    Not sure the link in main post (which I just added) to National Geographic has been posted on ABN -- interesting stuff.
  • iamMightyiamMighty
    But what if a piece of wood keeps travelling around the orbit but does not land on the platform(asteroid) and the level is over, wont you miss those points?
  • AMslimfordyAMslimfordy
    If you notice in the videos though, the gravitational field is in a restricted area. In the real world, it goes on indefinitely, just decreasing with distance.
  • mvnla2mvnla2
    Hope people are getting ready for ABOS by boning up on their physics. National Geographic book should be available 3/20.
  • 200mphfalcon200mphfalcon
    The tracers you use to aim with are similar to " bug chuckers " I'm not thrilled with this space version in general but it's still worth buying. Just not the excitement and prolonged destruction of the Chinese fireworks / dragon of recent past. That was brilliant. Things seem a bit to easy...I'm sure things will get better but more importantly ,this is only my opinion. there are some great ideas out there by players. I hope they are looked at by developers before putting out things that change AB's to much. I'm still playing it though.
  • 200mphfalcon200mphfalcon
    Ok, I'm not really thinking I have time to be here on this nice site / forum to shoot he breeze about the birds but I definitely see now that this space version I just got is bug chuckers.
    If you never ran into bug chuckers which is possible, calm down, you must agree to the similarities , yes ?
    Still an enjoyable , cool bird ame but where did he clever Rovio people turn the corner? I don't fret change. It's a good thing but such a departure? Enjoy people
  • BirdLeaderBirdLeader
    Try Danger Zone. It's most definitely not easy.
  • 200mphfalcon200mphfalcon
    It's actually getting better. My blow by blows over. I might be catching on to it and I think I was wrong in its enjoyment. It still s a Bug chuckers spin off and is also to small or iPad. iPhone or any phone or 7" tablet must be hard to see. I guess that's how things are in open space. Enjo
  • mvnla2mvnla2
    @200mphfalcon -- Welcome to ABN. You may have noticed that the topic of this forum is Physics of Angry Birds Space. Since its intent is to discuss physics, I don't think all that many people follow comments in this forum. You might get more responses by posting on a general interest page, such as http://www.angrybirdsnest.com/angry-birds-space-now-available/ You can find that page under More / Updates and Releases on the gold bar at the top of the page. You might also want to look at the chatter page, which is what you get if you click on More.
  • mvnla2mvnla2
    Still waiting for next Wired blog from Rhett Allain. Added an answer to main post.
  • mvnla2mvnla2
    Added short review of Nat'l Geo book.
  • mvnla2mvnla2
    @TruckDriver, other people with game programming experience: See question above about physics of SE, ME, MD. Can any of these be explained by physics incorporated in Box2D? Or when you summon them, do you exit Box2D and enter something more like a non-physical game program??? Or???
  • sherlockhoundsherlockhound
    I love AB Space and the physics. When I played level 2-23, the one with three planetoids tied together, I immediately thought of Lagrangian points (http://en.wikipedia.org/wiki/Lagrange_points), which many older space buffs will know as L-5, a proposed place for space colonies in Earth orbit.

    The birds make it a four-body problem, instead of three, but you'll note in the level that your birds when thrown, eventually end up between the three planets in a stable state. This is especially notable with the blue birds, who will sort of wobble in that location until they disappear.

    In orbit, the birds seem to obey Kepler's laws, more or less (http://en.wikipedia.org/wiki/Kepler's_laws_of_planetary_motion). From a planetoid, if you vary your launch trajectory, the bird behaves as you would expect: High angle launches will make your bird come down sooner--or achieve escape velocity. Low angle launches make your birds go further, and if you have the right angle, you'll get at least one orbit and often several.

    All of the birds can be orbited--even Terence!--but the titular red bird is the easiest to do. Their orbital performance will vary, which means that Rovio at least takes their mass into account, just as in the terrestrial game. If you follow space, you sometimes hear about "slingshot" launches assisted by the gravity of another planet, such as with our Mars probes. This works with our birds as well--try 1-12, for example.

    What I wonder about next is, doesn't this affect the piggies as well? These obnoxious pigs have built entire orbital installations that even NASA envies. Why aren't they affected by the same laws? Two objects tethered together in orbit, for instance, have some really interesting behaviours that NASA has tried to discover and exploit on numerous occassions over the years. AB Space has at least three levels that I know of with tethered pigs.

    At least we don't have to wonder how air bubbles can be maintained and replenished with breathable atmosphere for porcine lifeforms.
  • mvnla2mvnla2
    @Slim -- Added comment on Lagrangian points, but link to SammiShredd doesn't seem to work??? Can you help?
  • AMslimfordyAMslimfordy
    Got it.
  • mvnla2mvnla2
    Thanks! What did I do wrong?
  • AMslimfordyAMslimfordy
    Seems the closing quotation mark was in a different script.
  • mvnla2mvnla2
    New analysis from Rhett Allain, see above!
  • mvnla2mvnla2
    Added link to Rhett Allain's blog on Lagrange pts, see above.
  • mvnla2mvnla2
    Most of discussion on centripetal force achievement and Lagrangian point is occurring on the achievement page: http://www.angrybirdsnest.com/angry-birds-space-centripetal-force-achievement-walkthrough/
  • mvnla2mvnla2
    Added link to new Rhett Allain blog (see above).
  • TruckDriverTruckDriver
    @mvnla2 - Box2d doesn't seem to have been updated recently, so I don't know how much of it was tweaked by Rovio for AB:Sp. If there are any "special" tweaks for SE functionality, most of it is probably in Rovio's original code.
  • mvnla2mvnla2
    @all -- Haven't been keeping up with Rhett Allain recently, but noticed he recently posted an article on physics in Bad Piggies -- Enjoy
    http://www.wired.com/wiredscience/2012/11/the-mass-of-stuff-in-bad-piggies
    Haven't been keeping this forum up-to-date. Just noticed that it doesn't mention that the Lagrangian point achievement WAS bugged, and was fixed so that it wasn't really a Lagrangian point.
  • cosmo2503cosmo2503
    Rhett Allain blog is really great. There is a new article about physics of balloons in BP.
  • theanonymoussomeonetheanonymoussomeone
    The old Lagrangian point achievement (the one said to be impossible) actually can be done. I did it on accident.
  • angryboyangryboy
    I also got lagrangian achievement, around april 25, flung a bird backwards and got it
  • mvnla2mvnla2
    @theanonymoussomeone @angryboy-- I haven't updated this forum in a long time. When ABSp first came out, the "Lagrangian point" achievement was bugged. A lot (a few of us?) spent ridiculous amounts of time trying to get it. In a later update it was fixed, so it is now easy to get, but isn't really a Lagrangian point (which is a scientific term). If you're interested there is a lot of discussion on the achievement page: http://www.angrybirdsnest.com/angry-birds-space-centripetal-force-achievement-walkthrough/
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