415 replies to this topic

[SSNautilus]

Greets.

A lot has happened since we first started this topic. New versions of GM have appeared with better functions (and 3D) and our community has finally learned that nothing is "impossible" when it comes to GM.

I shall be periodically updating links in this post for DLLs and EDITABLE examples for physics related "innovations".

If you have made (or know of) any unique GM physics related example/dll, and would like to share them with the GM community please PM me.
________________________________________
Links of interest:

CoderChris's SUPERB GM Physics DLL + Examples
http://forums.gamema...howtopic=141853

Atrius's Examples:
http://www.kousougam...k/?act=download

Steffen Itterheim's GM + ODE DLL:
http://ode.org/
http://gamegestalt.c...o...7&Itemid=40

Macarrum's Tokamak 3D Physics Engine:
http://www.tokamakphysics.com/
http://forums.gamema...howtopic=117085

RTsa's Demo Game (using GM_ODE dll): Ragdoll Matrix: Reloaded
http://www.freewebs.com/rtsa/
http://forums.gamema...howtopic=115976

Bathy's Verlet Physics Engine based upon EricDB's scripts
http://forums.gamema...howtopic=142476

Edited by xot, 13 April 2008 - 06:19 AM.
** Old Experts Topic **

[Kornbizkit1718]

Yeah it is. you would just need a wicked (wicked wicked wicked wicked) Equastion, and for each limb (arms legs head feet etc) have them seperate and rotate them 360 degrees (well, 36 diffrent sprites).

[(-[TJ]-)]

True ragdoll physics aren't possible but that doesn't stop you using natural-looking ragdoll STYLE animations (like I did in my game INVADED).

[SSNautilus]

Hmm... I don't know about it being impossible.

Already I can see that the next version of GM deals better with contact/collisions with points/lines/etc. All that would be needed could be some IK calculations, and some nice collision code.

IK in bodyparts could be a nice -stitched- system of bodyparts (like in Poser) which looks something like:

hand-(joint)-forearm-(joint)-elbow-(joint)-biceps-(joint)-shoulder-(joint)-chest-(joint)-etc etc.

A lot of work perhaps - but regardless of Direct3D or not - the above method WILL probably be needed in one form or another to emulate realistic IK physics as a starting point. ie someone's gotta take the first step!

3D directions have already been simulated via perspective x,y,z scaling. I know it would be better in true 3D, but hey - I feel this is a doable idea.

Any takers?

[deadimp]

Well, you could use polygons that rotate on an axis, which is a joint. That joint's direction would be dependent on the joint' direction before it.
Ex: hand=hand_dir+elbow+shoulder+chest;

[videogamerx2]

GM is capable of calculating most of the mathmatics equally to most comercial languages, so I don't see any reason for it to not work. Though it could be unbearably slow.

[random]

True ragdoll physics aren't possible but that doesn't stop you using natural-looking ragdoll STYLE animations (like I did in my game INVADED).

Yes, animations can work well in some cases.

And it probably is possible, the question is whether it would run fast enough to make it any worth.

[Lyndon]

Ever play Lemmings 2? That had Ragdoll physics, it was also 2d. Sure it was not a pure form of ragdoll physics but it did the trick and looked funny as hell. Download it here http://www.qytis.com/lemmings2.zip and see what i mean, it will make you laugh.


---Guess this was something to with the moderation queue on this forum... Richard

I know that is already been written, but for some reason i couldnt reply to it, so here is my reply to it here. 2d games can have ragdoll effects sorta. In Lemmings 2, they have a sorta ragdoll effect, its very vyer funny check out at http://www.qytis.com/lemmings2.zip so Its possible just wont be as cool as 3d games. Just envolves sprites and some collision points.

Edited by Richard, 16 February 2004 - 01:54 PM.

[bearSoft]

Ragdoll physics is advanced even for the best engines today
the math behind it is descibed in this paper from io-interactive
ragdoll in hitman
I do not believe it could be even faked with gm

[Mastiff Odit]

The reason the Physics are so hard is because you have to emulate Enersha and Mass.(I hope I spelled that right)

You have to emulate the amount of Mass a character would have and then you would have to emulate the strength of the material that the doll is made of and how much Enersha (mometum) that each part of the doll has and in what direction at what speed.


Basicly you need a "true" Physics emulator in order to do it.
And that's REALLY hard to make and it would not be at all posible in GM because of how slow GML is, and the speed of our computers.


So, yes it is posible, but no, your not really going to do it with GM.
You could fake it but then it wouldn't look exactly right.

[SSNautilus]

Nice link BearSoft.

Aww.. come on guys. It's very easy to say it cannot be done. But has anyone really sat back and thought about it for a minute?

Here's what I think is possible as a very crude start:

We have 2 rope examples in the GM community. One is the Grappling hook. And another is the pacman-monster swinging from platforms like the "Bionic Commando" game.

Thus, the rope physics has already been done for varying elasticity and speed, based upon distance from sourcepoint.

How about using this 'rope' as the 'joint' described above? Naturally, when a collision occurs on one of the objects, it will move as collisions do, but the 'rope' will hold it in place thus limiting its motion, and so - hopefully - you'll see a ragdoll motion.

Not 100%, but its a start!

Now realistic physics does require things like density/directional acceleration/velocity/etc. They are simply variables on a nifty (or wicked as defined above) algorithm.

We already have gravity, speed, and a rope. The differring density between many bodyparts could be achieved via friction + directional gravity formula. Give heavier objects a higher downwards gravity, and tweak possibly more(?) friction (so they dont go flying about when hit?).

Hmm... come one people! We can do this. Let's skip 3D directions for now, and concentrate on just a 2D illusion - like a side scroller platform game (remember Flashback!??)

Can anyone make this joint 'rope' system come to life. I'm mathmatically challenged - else I'd do it myself.

Edited by SSNautilus, 17 February 2004 - 06:11 PM.

[viestituote]

I told this theory to some one in Q&A.. I didn't test it though backthen.

But now I decided to try...

I made this little hanging rope example in about 15 minutes.. try it out.. it's rather fancy.. viestituote.tripod.com/gm/ragdoll_rope.gmd or http://kotisivu.mtv3...agdoll_rope.gmd

I just played around with it and fixed there and there... it came up like this... I have never read any tutorial...

EDIT: Added another, better link.

Edited by viestituote, 18 February 2004 - 06:19 PM.

[L33TNerd]

the link came up as that comp language for me

Edited by L33TNerd, 17 February 2004 - 09:48 PM.

[SSNautilus]

Yes Hesla3, thats ragdoll effects. But could you make it with GM?

viestituote, your example is very nice. I have tweaked it a bit - but it doesn't seem to work correctly - as we need some sort of 'rigidity' between the ropes - or limitation of motion - else it becomes a snake-like motion (which you can see in my version of your example):

http://www.angeltown...sc/examples.htm

Both examples are included in the Ragdoll.zip file.

I have added various bodyparts made with Poser. I hope that helps.

[King Stephan]

Here's a pretty neat demo with incredible physics: go to http://www.miniclip.com/ and find the game "Trial Bike Pro."

[1800askgeek]

Maybe this'll sound silly, but... what on earth is a "ragdoll effect"???

[bearSoft]

>>viestituote the link opens the file as a html file
'save target as' alse refere to the html tag (anchor)
can u fix that?

>>nautilus. That is interesting thoughts -the thing we need to remember is that only sprite based graphics is reasonably fast on gm
if the graphics is drawn as pixels or solid figures gm gets sloggy and the fluidity is gone

the problem could very well be that it 'works' but it is useless in gamedesign due to the fps drop, (just like my old colorize.gmd btw.)

therefore succes should be jugded on whether fps can be kept unchanged high. If not the project is pure experimental and with no real 'value' in gamedesign
(amusing as it may be :)

>>hesla, the 'taat' project would be interesting to see -can u upload?

[gringo]

You could fake some form of ragdoll effect for the 2d world, which woul work well in a platformer.

example

you have a torso sprite, two upper arm sprites, two lower arm sprites, ect ect.

you will need some gravity and a var assined to each limb for force and direction. So it the force from the legs as a whole is > gravity and the direction is oppersit to the gravity the object (legs) are supporting the rest of the body up right.

if the torso has a large exerting pushing it in a direction the legs force can drop and the body will fall down and in the direction of the gravity.

Im sure I could come up with an example, though if I do the sprites will be poor(black rectangles).

Gringo