Phizix - Box2D

I'm releasing this now as I probably won't be working on it much longer. There is a new version of Box2D coming out that changes the very foundations of the engine, so if I want the new features I'll have to start over on the extension (which might be a good thing as it is very messy at the moment...)

I've fixed all known bugs (I think) and added a few new features since the last beta release. If there still happens to be some bugs left I'll look into it, but don't expect any new features to be added.

You can get it here

Awww... :'(
I can't download it... darn mediafire.

What's the problem exactly? I can upload it somewhere else if it's something serious.

I guess you need to allow pop ups. Thanks for the update Werbad, your effort is very much appreciated!

box.net is the best sharing site i have found so far, maybe clickteam will be happy to host it for you though. With these types of hosting the links always seem to go down a few months later etc so a clickteam hosting would be great if they are ok with it.

The reason I use mediafire is that it doesn't have any waiting time and never removes files unless you do it manually. I still have files uploaded june 2008 working. It was better when nobody knew about it though, it was a lot faster at that time... I'll see if I can get my brother to upload it at phizix.tk for me as that would likely be the best solution.

No problem, just send me the files in an email :)

When I use body/modify/angle I do get strange results while a ball is colliding with a tilted square... is this normal?

edit2: Added file here

http://www.clickteam.com/epicenter/ubbthreads.php?ubb=showflat&Number=169031&#Post169 031

In the released extension forum version, there is something terribly wrong with the Joints example in the testbed, it give 3 debug dialogues and then there is a line to everything on the screen...

I don't know how it happened, but it seems like the debug dialog I used when fixing one of the distance joint actions reinserted itself again somehow. I'm pretty sure I removed it after I found the error...

I've reuploaded a fixed version to mediafire, I'll have to wait for Daniel to update the one on phizix.tk though.

Edit: The file has now been updated on phizix.tk as well.

Thx,

Excellent object!!!

OK, but what about the lines? I don't think this is what was intended, and it wasn't like it in any of the previous versions.
http://www.LB-Stuff.com/MMF2/Box2D_LineBug.png
http://www.LB-Stuff.com/MMF2/Box2D_LineBug.png

That's the debug draw that I left in after my bug-fix. Remove the overlay and the event if you don't want it.

is it correct that it is only possible to attach one active to one body at once or it will crash? Could this be a possible feature?

You should be able to attach as many actives as you want to a single body. If it crashes it's a bug that must be fixed.

then I guess it is a bug. I'll try to single out the error.

Just out of curiosity, the current Box2D version implemented for MMF2 can do this? http://tim.kerchmar.com/prototypes/RopeBurn.html

It can be done with a distance joint, but you need to destroy and recreate it every time you extend or shorten the "rope" as Box2D doesn't support changing the length after a joint been created. I believe that demo does in fact modify the length, but it is not supported by default. You can see the problem with doing so by extending the rope into one of the walls.

Alternatively it can be created with a Revolute Joint, a Prismatic Joint and a dummy body at the anchor. You can then use the 2 joint's motors to handle the motion.

hmm I'll try. Thanks Jonas!

Sorry to bump this old topic.

Is it possible to have anti-matter? It would be really useful for, say, a Worms game where you would have the play area, and then apply circular anti-matters on explosions that would then negate the effects of the collision bodies on overlap areas.

if that made any sense :P

Not possible with the current Box2D version. The only way to do worms like terrain is to destroy and recreate the static geomerty when you blow parts of it up. The Chipmunk version has a demo of this, but it's a bit more troublesome to do in Box2D I'm afraid.

Hey Is it possible to create boring platform movement type objects in mmf2 and have them interact with and cause 2dbox objects to be weighed down or move on collision? kinda like the original mario jumping around on the pulley falling platforms. I couldn't break too deep in the demo but found that once the object was a body and influential within the 2dbox stuff it seemed like 2dbox took over all its movement options leaving it limited to "static" movement no matter what.

dismantel.com

Phizix - Box2D cannot, and will never be able to interact with MMF's movements or collision system. Everything has to be made through Box2D and events. Phizix is a very advanced extension and if you don't yet know how to make your own movements using events, you probably shouldn't be using this extension as it requires you to make most things yourself.

If you want it there is an example of a platform movement available here:
http://www.mediafire.com/?2kx4yww2zuo

Note that it is way more complicated than the testbed demos.

Do all the raycasting functions work? As i seem to be able to create a single ray cast between two ojects, but im trying to find out when another body gets i nthe way, what body ID it is, yet when i try to "get body id, raycast hit number" it is allways -1?

Thanks
Andy

The list is 0-based, if you want to get the ID of the first body hit you should use:

Code:

---

RayBodyID( "Phizix - Box2D", 0)

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If you want the last body hit you should use:

Code:

---

RayBodyID( "Phizix - Box2D", RayNumHits( "Phizix - Box2D" ) - 1)

---

In your example you should make a single shape ray-case between the 2 bodies and check if RayBodyID( "Phizix - Box2D", 0) is different from the second body's ID. Ray-casts will always ignore shapes they start inside.

Cheers for that werbad.

One more thing. Witht he force controller. You can set a force as X & Y.

I would like the force to be what ever the angle the active is? How can i go about this?

Thanks
Andy

That's not possible with any of the current controller types I'm afraid. But you can do it manually by always applying said force. Using the object interface this should be a one-liner.

Hi werbad, sorry i understand theres no actual action for this, but is there a calculation i could do, to work out the X and Y forces needed from the current angle of the body?

More a maths related question as aposed to box2d! :)

Thanks
Andy

Yes there is - you'd have to use sin/cos

I'm not sure how you'd do it, because I'm not sure how the forces work. But I'm sure Dines' tutorial can help you figure out what you need?

http://www.clickteam.com/epicenter/ubbthreads.php?ubb=showflat&Number=67082#Post67082

Actually this has to to with a bit more complex trig than that RickyRombo. The Forces are the legs of the right triangle and he needs to find some angles.

If you already have the angle you can just use: Cos(Angle) * Force and Sin(Angle) * Force.
Sometimes you have to invert the Y force though depending if the angle is clockwise or counter clockwise.

Thanks, but i cant seem to get that working, it makes it just allways want to go one way (to the left).

Any chance oa verty quick example?
Thanks
Andy

Its ok, ive done it thanks!

Andy

Quote:

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Originally Posted by Gibbon

Its ok, ive done it thanks!

Andy

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can you upload it then?