Comments on: creating a room in jiglibflash

By: wvxvw

wvxvw — Fri, 06 Feb 2009 13:06:02 +0000

Hi Richard.
Thanks for reply!
Another thing… and, I know it sounds like a pain in the rear place… but, can you by any chance reconsider naming of methods / properties to conform to the conventions? I know, it takes just a few minutes to run your code through some “beautifier” to get all those things sorted out, but, at some point you’d probably like to document it all / make updates / distribute it via SWC etc… so, that’d be a pain to rewrite the code… Or am I asking to much?

By: richard mattka

richard mattka — Fri, 06 Feb 2009 02:33:47 +0000

@wvxvw, you’re right some of the core classes for 3d are based on some of the pv3d core classes. You can see which ones by having a look inside some of them. We are working through the process of architecting things a little better. One avenue we are considering is how best to make the engine more modular so that it easily works with any 3d rendering engine (Sandy, Away or PV). So while some core 3d math may be taken directly from one engine, it may be that in future it gets tailored more specifically to the physics needs of the engine, and also retains its identity as unique from a similar class from one of the engines. Thanks for the comments!

By: wvxvw

wvxvw — Thu, 05 Feb 2009 23:40:38 +0000

Hi. Firstly, great job!
I’ve a question… are your Matrix3D and Number3D to different from analogues in PV3D, that you need your own? IMO, if they aren’t too different, it’d be better to use those of PVD, or somehow make them compatible… like, maybe, extending PVD classes? (org.papervision3d.core.math.Number3D looks very much the same as jiglib.math.JNumber3D)
and org.papervision3d.core.math.Matrix3D – jiglib.math.JMatrix3D).

By: Jey

Jey — Tue, 03 Feb 2009 12:26:35 +0000

Tks A lot, i am going to try !
Otherwise, how can i get the position of an object, should i get it from the 3d object or can i have it from the PhysikObject ( i would have it )
tks Richard

By: richard mattka

richard mattka — Mon, 02 Feb 2009 15:18:41 +0000

Hey Jey,
Great question. This is something we hope to get simplified in the code syntax soon. For now try using the multiply function of the JMatrix3D class, like so:
planePhysic.MoveTo(PlanePosition , JMatrix3D.multiply(JMatrix3D.rotationY(-90* Math.PI / 180), JMatrix3D.rotationX(-90 * Math.PI/180)));

HTH

By: Jey

Jey — Mon, 02 Feb 2009 13:15:03 +0000

Hey
At first good Job !
I am trying to use this library and i have a problem with the rotation!
i understood that it is in radian but how can i do to define X Y and Z rotation in the same time
for exemple if you have only a X rotation i write:
planePhysic.MoveTo(PlanePosition, JMatrix3D.rotationX(_plane.rotationX*(180/Math.PI) ));
And it works !
but if i want X Y AND Z Rotation , i dont know how i can do, this is my solution :
planePhysic.MoveTo(PlanePosition, JMatrix3D.rotationY(_plane.rotationY*(180/Math.PI) ));
planePhysic.MoveTo(PlanePosition, JMatrix3D.rotationZ(_plane.rotationZ*(180/Math.PI) ));

But it doesnt work.
Could you help me ?

By: richard mattka

richard mattka — Fri, 23 Jan 2009 03:40:30 +0000

@thivy . If you mean this demo here http://www.flashbookmarks.com/demos/jiglibtimestep/ then I can see what you mean. I do not see this occurring in my example here. Let me know if you do. It might be easier to help you out having a peek at your code. Join us at irc server freenode at channel #jiglibflash. Thanks for your interest, see you there!

By: thivy

thivy — Fri, 23 Jan 2009 03:22:56 +0000

Hey i tried your ways but it’s still going out of the wall. When i tried with the example they gave in the jiglib page it does the same thing. If you keep moving the ball towards the back wall you will see what i mean.

By: richard mattka

richard mattka — Fri, 23 Jan 2009 01:37:52 +0000

Hey Thivy,

It looks like the walls are not high enough. You say they are, but the walls in your table are short and visually the balls can get over the walls. Make sure both the PaperVision object (im assuming thats what you’re using) and the jiglib object are the same dimensions; that they correspond. I’m guessing they are different right now. I’d start by making sure they are the same and then test. After that experiment with them being different. The other approach might be to place “invisible” walls around the table as well. So ones with a skin that is on the back side of the PV wall only for example. That’s how I created my “4th wall” in my room example. The wall closest is transparent because I flipped it away from the camera. HTH

By: thivy

thivy — Fri, 23 Jan 2009 00:11:50 +0000

Hey i have a question on using jiglib and PV3D.
Have a look at this pool table i made. I took the example from the jiglib website and modified it to make this pool table.

The problem is, some times the balls on the table jump out even though i have a wall around it(the wall is 500 height so its definitely not going over the wall). could you please help me with this?

you can find the code at
http://www.thivy.com/blog/index.php/archive/jiglibflash-3d-physics-engine/