zylum
March 28, 2003, 1:14am
1
does anyone know a formula that causes an object to gravitate towards another stationary object? In the formula you can include the distance from the object and the objects mass as well as anything else you can think of.
I tried to figure it out myself, but the effect is not realistic. In my version, the gravity becomes stronger when the two objects are far apart and it becomes weaker as the objects are closer together… here’s what I used…
[AS] _root[nm].dx += ((_root[nm].diffx*-0.9999)+(_root[nm].diffx))*_root[nm].mass/3;[/AS]
the same for dy but using diffy…
the diffx and diffy are the distance apart and the mass is the sized of the stationary object… I hope someone can help me with this…
system
March 28, 2003, 1:32am
2
I have something around here somewhere…
I made in Flash 5 a while back - probably a lot cleaner if I redid it in MX
You’re welcome to it though
http://userpages.umbc.edu/~tmccau1/flash/test/gravity.swf http://userpages.umbc.edu/~tmccau1/flash/test/gravity.fla
system
March 28, 2003, 1:38am
3
thanks, i’m taking a look at them now…
system
March 28, 2003, 1:47am
4
is there any other way to do this? any simpler way using 2 formulas one for the x direction and one for the y? i only need the gravity for one object… any help?
system
March 28, 2003, 1:50am
5
http://download.com.com/3000-2400-10122652.html?tag=lst-0-1
[edit] it has nothing to do with AS, just gravity [/edit]
system
March 28, 2003, 2:41am
6
*Originally posted by zylum *
Theres always another way
*Originally posted by zylum *
More than likely
*Originally posted by zylum *any simpler way using 2 formulas one for the x direction and one for the y?
dividing one function into 2? Why seperate? Is that supposed to make it easier? 8]
system
March 29, 2003, 6:22pm
7
I didn’t have a look at Sen’s very nice file, but why don’t you implement Newton’s law of gravitation. The formula is pretty straightforward and all you’ll have to do is tweak the numbers a bit.
pom
system
March 29, 2003, 6:42pm
8
I’m not sure what the formula should look like… i tried this but the result is really wierd:q: the formula I used is:
[AS] _root[nm].dx += 9.8*(_root[nm].mass/_root[nm].diffx);
i dunno what’s wrong… maybe someone can help me with the formula
-mike
system
March 29, 2003, 10:34pm
9
Well… Let’s look at the actual physics formulafor gravitational pull between two masses.
Force = (Gravitational Constant * mass1 * mass2)/ (r * r);
r is the distance between the two objects…
So… Let’s do a pretty rough estimation on how close they are instead of doing it as a tight wad…
r = Math.abs(object1._x - object2._x);
The Gravitation Constant… of G… You will have to play around with this figure… But it will always stay the same.
The mass’s… You could make a mass forumla saying
mass1 = object1._width * object1._height;
So… Now that we have all our constants… We can place them into one gigantic formula.
ForceX = (9.8 * (object1._width * object1._height) * (object2._width * object2._height) / Math.abs((object1._x - object2._x) * (object1._x - object2._x));
Of course you can just give your objects a mass ahead of time and that’s it… But I personally Like to use the method I did above.
Of course… In a computer programming environment you need to do this however…
ForceX +=
And then… Take the object you wish to move and add on that force…
_root.object1._x = ForceX;
If this startsgiving you funn results… Try getting rid of the Math.abs…
playamarz :player:
