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Author Topic: Physics Lessons  (Read 51209 times)

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Offline ruler501

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Re: Physics Lessons
« Reply #60 on: February 03, 2011, 07:38:04 pm »
If launched at an angle it is more complex but It was explained to me so I don't think its as hard anymore. i still think there should be an article here for it though. I can't do it because I couldn't show sample code. I only know python and C++. these lessons are still applicable there which is why I'd like an article here
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Offline squidgetx

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Re: Physics Lessons
« Reply #61 on: February 03, 2011, 07:38:56 pm »
Builderboy: if you don't feel like it I could write one for you; I just explained it to ruler so I'm kinda in the mood lol ;)
edit: actually, it would probably be suitable as a small addition to the first post, about gravity...
« Last Edit: February 03, 2011, 07:41:04 pm by squidgetx »
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Offline Calcaholic

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Re: Physics Lessons
« Reply #62 on: February 03, 2011, 08:02:04 pm »
Could'nt you express that angle simply as gradient and split this gradient into a X- and a Y-velocity; where the y-velocity would be affected by gravity, while the x-velocity wouldn't?

But I can imagine, that this is horribly unoptimized... ;)
« Last Edit: February 03, 2011, 08:02:32 pm by Calcaholic »
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Offline shmibs

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Re: Physics Lessons
« Reply #63 on: February 04, 2011, 12:32:15 am »
everyone has been going craxy over cellular automata recently, so i decided to make a quick little open-source demo to act as reference.

it most certainly isn't optimised (or even constructed in a matter which will allow particles to interact with one another beyond collisions), but it at least gets the idea across. ADA is the source. the controls are fairly straight-forward, involving nothing more than 2nd, alpha, and the arrow keys (and clear to quit).
« Last Edit: February 04, 2011, 01:32:40 am by shmibs »
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Offline AngelFish

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Re: Physics Lessons
« Reply #64 on: February 04, 2011, 12:34:16 am »
Now I'm forced to work on Powder. You know that right? :P

Good job otherwise.
« Last Edit: February 04, 2011, 12:34:39 am by Qwerty.55 »
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Offline DJ Omnimaga

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Re: Physics Lessons
« Reply #65 on: February 04, 2011, 03:07:52 am »
Nice shmibs. :D
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Offline Michael_Lee

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Re: Physics Lessons
« Reply #66 on: February 04, 2011, 03:03:45 pm »
Nice.  I like how the flames eat at the walls.

@ Builderboy: A while back, it looks like you were planning on adding a tutorial on collision detection?  Are you still planning on adding that?
« Last Edit: February 04, 2011, 03:04:02 pm by Michael_Lee »
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Offline kindermoumoute

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Re: Physics Lessons
« Reply #67 on: February 05, 2011, 06:10:55 pm »
Your tutorial is very interesting, but I fail to apply your phisic in my multiplayer game. I've 8 player maximum, each player got 4 bytes to him : X and Y position on tilemap, an other information and his velocity. So, the array to manipulate is :
Code: [Select]
{N*4+GDB0+A}N is actual player, and A is byte we want modify (1st, 2nd, 3rd or 4th).

Players take turns, but all must be attracted by gravity. M is total number of player. Here my bad code :
Code: [Select]
:Lbl G
:For(Θ,0,M)
:For(r3,0,{Θ*4+GDB0→r5+3}
:If sub(GN,5+{r5},4+{r5+1}+1)=0
{r5+1}+1→{r5+1}
:End
:End
:If sub(GN,5+{r5},4+{r5+1}+1)=0
:{r5+3}+A→{r5+3}
:Else
:0→{r5+3}
:End
:End
:ReturnSubroutine GN extract byte from tilemap :
Code: [Select]
:Lbl GN
:r2*102+r1→r1
:{r1/2+D}→r2
:If r1^2
:r2^16
:Else
:r2/16
:End
:Return
Have you an idea ? ???

You understand that your physical system is very useful, especially for jumps. ;D
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Offline shmibs

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Re: Physics Lessons
« Reply #68 on: February 07, 2011, 01:48:44 am »
i was in la for the weekend and got bored, so i decided to clean up that little demo a bit and make it look more professional. the flames are now slightly more realistic, particles are displayed in gray when the program is run on an SE, and there are ? particles? (i think they're killer bees... :P)
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Offline Builderboy

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Re: Physics Lessons
« Reply #69 on: February 07, 2011, 01:54:40 am »
Alright, first, can't quite figure out what sub GN is suposed to do..  what does variable D mean?  It isn't used anywhere else in the code you posted.

Second, why are you looping from 0 to your velocity? For(r3,0,{Θ*4+GDB0→r5+3}) I think you want to move your character forward 1 space and check for collision each time?  Problems are going to arise when your velocity becomes negative.  I recommend switching to x256 format, since you are working with physics, and I recommend just incrementing your characters position by their velocity.  If they collide with an object, move them back to where they were before, and reverse the velocity.


EDIT: WOW thats an amazing application of cellular automata!  Outstanding! 
« Last Edit: February 07, 2011, 01:59:37 am by Builderboy »
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Offline kindermoumoute

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Re: Physics Lessons
« Reply #70 on: February 07, 2011, 01:28:58 pm »
GN is not the problem, it return the good tile (D point appvars Data).
My problem is hard to explain (at least with my bad english), I want use your phisic in a multi-player game. How can I affect every players in same time I'm moving in a tilemap ?
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Offline DJ Omnimaga

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Re: Physics Lessons
« Reply #71 on: February 07, 2011, 01:57:31 pm »
Wow shmibs that is amazing! You should make a new thread about this. :)
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Offline Builderboy

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Re: Physics Lessons
« Reply #72 on: February 07, 2011, 06:42:05 pm »
Quote from: kindermoumoute on February 07, 2011, 01:28:58 pm
GN is not the problem, it return the good tile (D point appvars Data).
My problem is hard to explain (at least with my bad english), I want use your phisic in a multi-player game. How can I affect every players in same time I'm moving in a tilemap ?

Ah you mean you have a scrolling tilemap?
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Offline kindermoumoute

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Re: Physics Lessons
« Reply #73 on: February 08, 2011, 03:50:52 am »
Yes, I would like to add phisic gravity in my worms game :
Spoiler For Spoiler:

You can found the code here : here (a little old)
So, my gravity was this :
Code: [Select]
:Lbl G
:For(?,0,M)
:If sub(GN,5+{?*3+GDB0},5+{?*3+GDB0+1})=0 and (getKey(4)=0
:{?*3+GDB0+1}+1?{?*3+GDB0+1}
:End
:End
:ReturnYour phisic system could be usefull to do some jump like here :
Spoiler For Spoiler:
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Offline Builderboy

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Re: Physics Lessons
« Reply #74 on: February 08, 2011, 11:17:44 am »
Well first off, if you want realistic pysics, you might want to consider switching to x256 format.  This is where every time you add 256 to your position variables, your character moves 1 pixel.  This will allow you to have more precision and possibly get the gravity effects you are looking for.

However, If you do not want to use x256 format and stick with what you have, you can try this simple physics piece of code:

Code: [Select]
:Lbl G
:Θ*3+GDB0->r5
:If {r5+3}>>-7
:{r5+3}+1->{r5+3}
:End
:
:{r5+1}+{r5+3}->{r5+1}
:While sub(GN,{r5}+5,{r5+1}+5
:If {r5+3}>>0
:{r5+1}-1->{r5+1}
:Else
:{r5+1}+1->{r5+1}
:End
:End
:
:If sub(GN,{r5}+5,{r5+1}+5)=0 && getKey(4)
:-7->{r5+3}
:End
:Return
This piece of code *should* give you some realistic gravity and jumping in your game
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