Comments on: PhysExplosion- Explosion method for Box2D AS3

By: unity3D gamer

unity3D gamer — Sun, 08 May 2011 16:59:30 +0000

It’s funny how the ‘<' sign converted to '<' at first I was searching for variable 'lt' thinking its some boolean 'i and lt' (i<)
thanks for the code. I will try it with WCK.

By: Germain LECOURTOIS

Germain LECOURTOIS — Wed, 23 Mar 2011 09:20:57 +0000

Thanks Faraz ! I’ll try as soon as possible

By: faraz

faraz — Sun, 27 Feb 2011 10:34:29 +0000

this is much more like it

var angle:Number = Math.atan2(-1 * pHitVector.y,pHitVector.x);
var torque:Number = Math.sin(angle + Math.PI) * Math.cos(angle + Math.PI);
torque=(Math.sin(angle + Math.PI) < 0) ? torque :torque*-1;
pBody.ApplyTorque(torque*nHitForce*2);

By: faraz

faraz — Sun, 27 Feb 2011 06:50:41 +0000

simply add these two lines after applyImpulse and you will get angular velocity

var angle:Number=Math.atan2(pHitVector.y,pHitVector.x)
pBody.ApplyTorque(angularV*nHitForce)

thats not very correct i guess but it seems right

By: Felipe

Felipe — Sat, 29 Jan 2011 13:42:36 +0000

How do I make this AS work? Can’t apply point of explosion and other forces. Does anybody has any example?

By: Germain LECOURTOIS

Germain LECOURTOIS — Wed, 01 Dec 2010 12:31:34 +0000

@Bigz Hello ! J’avais du trouver l’algo ici :
http://www.box2d.org/forum/viewtopic.php?f=8&t=3184

Il est plutôt simple et s’applique au centre de gravité simplement, donc pas de rotation générée. Il faudrait y retoucher un peu et utiliser le raytrace.

By: Bigz

Bigz — Mon, 05 Jul 2010 18:16:01 +0000

Bonjour Germain.

Je voulais savoir où tu avais trouvé la version c++ de cette méthode.

Merci à toi.

Bigz

By: Tony

Tony — Mon, 11 Jan 2010 11:20:12 +0000

Salut Germain,

Ca fait un bail (je n’ai pas ouvert msn depuis 1 an à peu près…

Tu bosses où en ce moment ?
Moi, je suis chez Bouygues Tel (Applis sur SetTopBox)

Très intéressant ces travaux sur Box2D !

Passe le bonjour au collègue edocoien à l’occaz

++
Tony

By: charlie

charlie — Fri, 11 Dec 2009 14:57:42 +0000

ahhh, good find on the RayCast stuff…

My implementation works similarly, but is nowhere near as efficient…

I think it’s a slight shame that the box2d manual is so basic… (and doesn’t include some of the great additions.)

By: Germain LECOURTOIS

Germain LECOURTOIS — Sun, 06 Dec 2009 21:40:50 +0000

@charlie I found informations on RayCast
http://www.box2d.org/wiki/index.php?title=TestSegment
And AS3 application in : http://personal.boristhebrave.com/project/box2d-raycasts

By: SusieBusparish

SusieBusparish — Sun, 06 Dec 2009 12:56:10 +0000

Een van de interessantste plaatsen die ik heb ontmoet.

By: Germain LECOURTOIS

Germain LECOURTOIS — Fri, 27 Nov 2009 17:30:49 +0000

Tanks for your interesting comment !

Il will add notes and schema in this post to explain difficulties to render a good explosion (Point of application, center mass, density 0 bodies …)