Archive for the ‘VISUALIZATION’ Category

Monday, November 17th, 2008

Augmented reality is a very cool technology.  It is the star wars holograms that we always want, it is playing a game that maps out the physical world mixed with virtual assets, it is straight up cool.

The FLARToolKit is doing some of this cool in Flash.  This little toolkit is pretty sweet mapping points and sets of points to patterns, colors or other visual queues that technology can latch onto.  Combine this with a webcam and you have some pretty cool AR.

(more…)

Saturday, June 21st, 2008

[youtube]http://www.youtube.com/watch?v=YEM-XAeY4K0[/youtube]

3D models from basic video… This can be huge in all sorts of ways.  For exponential growth you need to go virtual.

  • This is a technology called VideoTrace from Australia
  • The Siggraph paper describing VideoTrace is available here (pdf 6MB)
  • Larger videos available here, with a more compressed version here.
Tuesday, April 22nd, 2008

Sunday, April 6th, 2008

Nicolas Cannasse, a virtual machine genius (maker of MTASC compiler, Neko and haXe (haXe compiles to target flash 6-9 but really only flash 9 is used anymore unless you are making banners)) released the Physaxe 2D Physics kit for haXe today.

It is heavily based on Glaze (demos) and Box2D which the Motor2, Glaze and Box2DFlashAS3 physics kits are all based on. Box2D is a great C++ 2D physics engine, it is simple which lended itself to being ported to AS3 quite easily. It is also a testament to AS3 that C++ kits are being ported into the language, not once, but many times. Also C ports like Chipmunk and other signs point to == AS3 is of fun.

Physaxe is quite amazing you must see the demos (very similar to Glade demos), it will get the inspirational wheels turning in your idea machines.

2D Physics in Flash and AS3 are extremely hot and can be used for many, many things from game development to promotions to simulations to user interface or visualizations and even modeling natural systems. It is nice to have a port of Box2D and similar to glade capabilities with Chipmunk like Glade has.

A game and physics engine for Flash including:

  • Rigid Body Dynamics
  • Scene management
  • Line of sight
  • User Input
  • Scrolling
  • AI

Core parts of the physics solver and collision system are based on the C physics engine Chipmunk

Notes about Physaxe:

Physaxe is a 2D Rigid Body Library written in haXe. It’s been highly optimized for the Flash 9 Player, with the best optimizations available.

Physaxe is based on several existing physics engines, mainly :

  • Box2D, the reference open source physics engine
  • Glaze, an AS3 engine which is a port of Chipmunk, itself based on Box2D

Physaxe features are :

  • rigid body consisting in several shapes
  • shapes supported are circles, segments (with rounded edges) and arbitrary convex polygons
  • customizable broadphase (currently bruteforce and y-sorted list are available)
  • island resolution and sleeping (allow ~0 CPU to be spent when groups are sleeping)
  • constraint solver based on Box2D sequential impulses
  • customizable body properties, such as linear/angular friction and maximized motion

Updated list of physics engines are like this:

AS3 3D Physics Engines (Open Source)

AS3 2D Physics Engines (Open Source)

haXe 2D Physics Engines

Get your game on! It is best to get them out early and often. I need to take my own advice.

Sunday, April 6th, 2008

TweenMax (Speed Test) has been released that adds a main feature missing from GreenSock’s offerings in tween animation libraries and kits over Tweener. That is the bezier curve tween. Tweener is very popular for use in PV3d and AS3 due to the bezier curve and Zeh’s great example that is really the base of a possible 3d editor. TweenMax now adds this and bezier tween capability for the GreenSock animation libraries.

Tweener and TweenLite have become the micro animation kits as well as micro kits you can make with Go base kits. TweenLite, TweenFilterLite and TweenMax divided up into different kits allows it to be embedded for banners or small assets easier if you don’t need the filters or other advanced tweens (this comes into play heavily with large games and asset collections when the compiled SWF each need the library). Tweener packs all features into one kit for simplicity. GreenSock kits are divided up for need. The comparison together is about the same but for basic tweens TweenLite is only 2k.

Performance is one area that the kits from GreenSock have really shined and since the addition of the speed tests and benchmarks it has become a great focus on showing how the open source kits are much better than bloated included animation calls in Flash and Flex defaults. I think all the kits have niches that they fit and Tweener and TweenLite are just very simple to use which adds alot to an animation kit success.

List of Animation Kits for AS3 (some for AS2 as well)

If you are using the Flex of Flash default animation classes, I am sorry…

Saturday, March 22nd, 2008

Forrest Briggs throwing down with a real-time raytracer in AS3. Also a C++ OpenGL version sample on the page.

Real-time pixel manipulation in flash is getting faster, but is still probably going to have to be faked in AS3, maybe AS4 will provide us per pixel speeds that Andre Michelle has been harping on since flash 8.5. Native operations can be much faster in that area. AIF might look to change some of that but that is Flash 10.

Here is the code for the as3 raytracer. Read more at laserpirate.

package
{
import flash.display.Sprite;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.events.Event;
import flash.utils.getTimer;
import flash.events.MouseEvent;
import flash.text.TextField;
import flash.text.TextFormat;

public class RayTracer extends Sprite
{
 private var t:Number;
 private var dt:Number = .01;
 private var frameTimeTxt:TextField;

 public static const BUFFER_WIDTH:int = 160;
 public static const BUFFER_HEIGHT:int = 120;
 public static const BUFFER_SCALEDDOWN:int = 320 / BUFFER_WIDTH;

 public static const HALF_BUFFER_WIDTH:int = BUFFER_WIDTH / 2;
 public static const HALF_BUFFER_HEIGHT:int = BUFFER_HEIGHT / 2;

 private var outputBitmapData:BitmapData;
 private var outputBitmap:Bitmap;

 public var FOV:Number = 20;

 public var sphereCenterX:Array 	= [0,	0,		0, 		0];
 public var sphereCenterY:Array 	= [0, -.2,	.4, 		100.5];
 public var sphereCenterZ:Array 	= [4, 	4,		4, 		10];
 public var sphereRadius:Array 	= [.35, .35,	.25, 	100];
 public var sphereR:Array 		= [255,	0,		0,		20];
 public var sphereG:Array 		= [0, 	150,	0,		20];
 public var sphereB:Array 		= [0, 	0,		255,	20];
 public var sphereReflects:Array = [false, false, false, true];
 public var sphereReflectiveness:Array = [0,0,0,.3];
 public var sphere2dX:Array = new Array(sphereCenterX.length);
 public var sphere2dY:Array = new Array(sphereCenterX.length);
 public var sphere2dR:Array = new Array(sphereCenterX.length);

	public var numSpheres = sphereCenterX.length;

	var skyR:int =  20;
 var skyG:int =  20;
 var skyB:int =  20;
 var skyColor:int = (skyR< <16) + (skyG<<8) + skyB;
 var ambientIllumination:Number = .1;

	var canvas:BlankClip;

	var theta:Number = 0;
 var mouseIsDown:Boolean = false;
 var mouseDownTheta:Number = 0;
 var mouseDownX:Number = 0;

	public function RayTracer()
 {
 	outputBitmapData = new BitmapData(BUFFER_WIDTH, BUFFER_HEIGHT, false);
 	outputBitmap = new Bitmap(outputBitmapData);
 	addChild(outputBitmap);
 	//outputBitmap.smoothing = true;

		outputBitmap.width= 320;
 	outputBitmap.height = 240;

		canvas = new BlankClip;
 	addChild(canvas);
 	canvas.buttonMode = true;
 	canvas.useHandCursor = true;

		frameTimeTxt = new TextField();
 	frameTimeTxt.defaultTextFormat = new TextFormat("Arial");
 	frameTimeTxt.x = 8;
 	frameTimeTxt.y = 8;
 	frameTimeTxt.width = 640;
 	frameTimeTxt.textColor = 0xFFFFFF;
 	frameTimeTxt.selectable = false;
 	addChild(frameTimeTxt);

		t = 0;
 	addEventListener(Event.ENTER_FRAME, update, false, 0, true);

		canvas.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
 	canvas.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
 }

	public function mouseDownHandler(e:*):void
 {
 	mouseIsDown = true;
 	mouseDownX = stage.mouseX;
 	mouseDownTheta = theta;
 }

	public function mouseUpHandler(e:*):void
 {
 	mouseIsDown = false;
 }

	public function update(e:*)
 {
 	// start frame timer and update global time
 	var timer:Number = getTimer();
 	t += dt;

		// handle mouse rotation
 	if( mouseIsDown ) theta = mouseDownTheta - .0015 * (stage.mouseX - mouseDownX);
 	theta += dt;

		// do some funky animation
 	sphereCenterX[0] = .5*Math.sin(theta*5);
 	sphereCenterZ[0] =1 + .5*Math.cos(theta*5);

		sphereCenterX[1] = .5*Math.sin(theta*5 + 2 * Math.PI / 3);
 	sphereCenterZ[1] = 1 + .5*Math.cos(theta*5 + 2 * Math.PI / 3);

		sphereCenterX[2] = .5*Math.sin(theta*5 + 4 * Math.PI / 3);
 	sphereCenterZ[2] = 1 + .5*Math.cos(theta*5 + 4 * Math.PI / 3);

		// reused variables
 	var x:int;
 	var y:int;
 	var i:int;
 	var j:int;

		var r:int;
 	var g:int;
 	var b:int;

		var dx:Number;
 	var dy:Number;

		var rayDirX:Number;
 	var rayDirY:Number;
 	var rayDirZ:Number;
 	var rayDirMag:Number;

		var reflectRayDirX:Number;
 	var reflectRayDirY:Number;
 	var reflectRayDirZ:Number;

		var intersectionX:Number;
 	var intersectionY:Number;
 	var intersectionZ:Number;

		var reflectIntersectionX:Number;
 	var reflectIntersectionY:Number;
 	var reflectIntersectionZ:Number;

		var rayToSphereCenterX:Number;
 	var rayToSphereCenterY:Number;
 	var rayToSphereCenterZ:Number;

		var lengthRTSC2:Number;
 	var closestApproach:Number;
 	var halfCord2:Number;
 	var dist:Number;

		var normalX:Number;
 	var normalY:Number;
 	var normalZ:Number;
 	var normalMag:Number;

		var illumination:Number;
 	var reflectIllumination:Number;

		var reflectR:Number;
 	var reflectG:Number;
 	var reflectB:Number;

		// setup light dir
 	var lightDirX:Number = .3;
 	var lightDirY:Number = -1;
 	var lightDirZ:Number = -.5;
 	var lightDirMag:Number = 1/Math.sqrt(lightDirX*lightDirX +lightDirY*lightDirY +lightDirZ*lightDirZ);
 	lightDirX *= lightDirMag;
 	lightDirY *= lightDirMag;
 	lightDirZ *= lightDirMag;

		// vars used to in intersection tests
 	var closestIntersectionDist:Number;
 	var closestSphereIndex:int;
 	var reflectClosestSphereIndex:int;

		// compute screen space bounding circles
 	//canvas.graphics.clear();
 	//canvas.graphics.lineStyle(1, 0xFF0000, .25);
 	for(i = 0; i < numSpheres; ++i)
 	{
 		sphere2dX[i] = (BUFFER_WIDTH / 2 + FOV * sphereCenterX[i] / sphereCenterZ[i]);
 		sphere2dY[i] = (BUFFER_HEIGHT /2 + FOV * sphereCenterY[i] / sphereCenterZ[i]);
 		sphere2dR[i] = (3 * FOV * sphereRadius[i] / sphereCenterZ[i]);
 		//canvas.graphics.drawCircle(sphere2dX[i]*BUFFER_SCALEDDOWN, sphere2dY[i]*BUFFER_SCALEDDOWN, sphere2dR[i]*BUFFER_SCALEDDOWN);
 		sphere2dR[i] *= sphere2dR[i]; // store the squared value
 	}

		// write to each pixel
 	outputBitmapData.lock();
 	for(y = 0; y < BUFFER_HEIGHT; ++y)
 	{
 		for(x = 0; x < BUFFER_WIDTH; ++x)
 		{
 			// compute ray direction
 			rayDirX = x - HALF_BUFFER_WIDTH;
 			rayDirY = y - HALF_BUFFER_HEIGHT;
 			rayDirZ = FOV;

				rayDirMag = 1/Math.sqrt(rayDirX * rayDirX + rayDirY * rayDirY +rayDirZ * rayDirZ);
 			rayDirX *= rayDirMag;
 			rayDirY *= rayDirMag;
 			rayDirZ *= rayDirMag;

				/// trace the primary ray ///
 			closestIntersectionDist = Number.POSITIVE_INFINITY;
 			closestSphereIndex = -1
 			for(i = 0; i < numSpheres; ++i)
 			{
 				// check against screen space bounding circle
 				dx = x - sphere2dX[i];
 				dy = y - sphere2dY[i];
 				if( dx * dx + dy * dy > sphere2dR[i] ) continue;

					// begin actual ray tracing if its inside the bounding circle

					lengthRTSC2 = 		sphereCenterX[i] * sphereCenterX[i] +
 									sphereCenterY[i] * sphereCenterY[i] +
 									sphereCenterZ[i] * sphereCenterZ[i];

					closestApproach =	sphereCenterX[i] * rayDirX +
 									sphereCenterY[i] * rayDirY +
 									sphereCenterZ[i] * rayDirZ;

					if( closestApproach < 0 ) // intersection behind the origin
 					continue;

					halfCord2 = sphereRadius[i] * sphereRadius[i] - lengthRTSC2 + (closestApproach * closestApproach);
 				if( halfCord2 < 0 ) // ray misses the sphere
 					continue;

					// ray hits the sphere
 				dist = closestApproach - Math.sqrt(halfCord2);
 				if( dist < closestIntersectionDist )
 				{
 					closestIntersectionDist = dist;
 					closestSphereIndex=i;
 				}
 			}
 			/// end of trace primary ray ///

				// primary ray doesn't hit anything
 			if( closestSphereIndex == - 1)
 			{
 				outputBitmapData.setPixel(x, y, skyColor);
 			}
 			else // primary ray hits a sphere.. calculate shading, shadow and reflection
 			{
 				// location of ray-sphere intersection
 				intersectionX = rayDirX * closestIntersectionDist;
 				intersectionY = rayDirY * closestIntersectionDist;
 				intersectionZ = rayDirZ * closestIntersectionDist;

					// sphere normal at intersection point
 				normalX = intersectionX - sphereCenterX[closestSphereIndex];
 				normalY = intersectionY - sphereCenterY[closestSphereIndex];
 				normalZ = intersectionZ - sphereCenterZ[closestSphereIndex];
 				normalX /= sphereRadius[closestSphereIndex]; // could be multiply by precacluated 1/rad
 				normalY /= sphereRadius[closestSphereIndex];
 				normalZ /= sphereRadius[closestSphereIndex];

					// diffuse illumination coef
 				illumination = 	normalX * lightDirX +
 								normalY * lightDirY +
 								normalZ * lightDirZ;

					if( illumination < ambientIllumination )
 					illumination = ambientIllumination;

					/// trace a shadow ray ///
 				var isInShadow:Boolean = false;
 				for(j = 0; j < numSpheres; ++j)
 				{
 					if( j == closestSphereIndex ) continue;

						rayToSphereCenterX = sphereCenterX[j] - intersectionX;
 					rayToSphereCenterY = sphereCenterY[j] - intersectionY;
 					rayToSphereCenterZ = sphereCenterZ[j] - intersectionZ;

						lengthRTSC2 = 		rayToSphereCenterX * rayToSphereCenterX +
 										rayToSphereCenterY * rayToSphereCenterY +
 										rayToSphereCenterZ * rayToSphereCenterZ;

						closestApproach =	rayToSphereCenterX * lightDirX +
 										rayToSphereCenterY * lightDirY +
 										rayToSphereCenterZ * lightDirZ;
 					if( closestApproach < 0 ) // intersection behind the origin
 						continue;

						halfCord2 = sphereRadius[j] * sphereRadius[j] - lengthRTSC2 + (closestApproach * closestApproach);
 					if( halfCord2 < 0 ) // ray misses the sphere
 						continue;

						isInShadow = true;
 					break;

					}

					/// end of shadow ray ///

					if( isInShadow ) illumination *= .5;

					/// trace reflected ray ///
 				if( sphereReflects[closestSphereIndex] )
 				{
 					// calculate reflected ray direction
 					var reflectCoef:Number = 2 * (rayDirX * normalX + rayDirY * normalY + rayDirZ * normalZ);
 					reflectRayDirX = rayDirX - normalX * reflectCoef;
 					reflectRayDirY = rayDirY - normalY * reflectCoef;
 					reflectRayDirZ = rayDirZ - normalZ * reflectCoef;

						closestIntersectionDist = Number.POSITIVE_INFINITY;
 					reflectClosestSphereIndex = -1
 					for(j = 0; j < numSpheres; ++j)
 					{
 						if( j == closestSphereIndex ) continue;

							rayToSphereCenterX = sphereCenterX[j] - intersectionX;
 						rayToSphereCenterY = sphereCenterY[j] - intersectionY;
 						rayToSphereCenterZ = sphereCenterZ[j] - intersectionZ;

							lengthRTSC2 = 		rayToSphereCenterX * rayToSphereCenterX +
 											rayToSphereCenterY * rayToSphereCenterY +
 											rayToSphereCenterZ * rayToSphereCenterZ;

							closestApproach = 	rayToSphereCenterX * reflectRayDirX +
 											rayToSphereCenterY * reflectRayDirY +
 											rayToSphereCenterZ * reflectRayDirZ;

							if( closestApproach < 0 ) // intersection behind the origin
 							continue;

							halfCord2 = sphereRadius[j] * sphereRadius[j] - lengthRTSC2 + (closestApproach * closestApproach);
 						if( halfCord2 < 0 ) // ray misses the sphere
 							continue;

							// ray hits the sphere
 						dist = closestApproach - Math.sqrt(halfCord2);
 						if( dist < closestIntersectionDist )
 						{
 							closestIntersectionDist = dist;
 							reflectClosestSphereIndex=j;
 						}
 					} // end loop through spheres for reflect ray

						if( reflectClosestSphereIndex == - 1) // reflected ray misses
 					{
 						r = sphereR[closestSphereIndex] * illumination;
 						g = sphereG[closestSphereIndex] * illumination;
 						b = sphereB[closestSphereIndex] * illumination;

						}
 					else
 					{
 						//trace("ref hit");
 						// location of ray-sphere intersection
 						reflectIntersectionX = reflectRayDirX * closestIntersectionDist + intersectionX;
 						reflectIntersectionY = reflectRayDirY * closestIntersectionDist + intersectionY;
 						reflectIntersectionZ = reflectRayDirZ * closestIntersectionDist + intersectionZ;

							// sphere normal at intersection point
 						normalX = reflectIntersectionX - sphereCenterX[reflectClosestSphereIndex];
 						normalY = reflectIntersectionY - sphereCenterY[reflectClosestSphereIndex];
 						normalZ = reflectIntersectionZ - sphereCenterZ[reflectClosestSphereIndex];

							normalX /= sphereRadius[reflectClosestSphereIndex]; // could be multiply by precacluated 1/rad
 						normalY /= sphereRadius[reflectClosestSphereIndex];
 						normalZ /= sphereRadius[reflectClosestSphereIndex];

							// diffuse illumination coef
 						reflectIllumination = 	normalX * lightDirX +
 												normalY * lightDirY +
 												normalZ * lightDirZ;

							if( reflectIllumination < ambientIllumination )
 							reflectIllumination = ambientIllumination;

							r = sphereR[closestSphereIndex] * illumination + .5 * sphereR[reflectClosestSphereIndex] * reflectIllumination;
 						g = sphereG[closestSphereIndex] * illumination + .5 * sphereG[reflectClosestSphereIndex] * reflectIllumination;
 						b = sphereB[closestSphereIndex] * illumination + .5 * sphereB[reflectClosestSphereIndex] * reflectIllumination;
 						if( r > 255 ) r = 255;
 						if( g > 255 ) g = 255;
 						if( b > 255 ) b = 255;

						}  // end if reflected ray hits

					} /// end if reflects
 				else // primary ray doesn't reflect
 				{
 					r = sphereR[closestSphereIndex] * illumination;
 					g = sphereG[closestSphereIndex] * illumination;
 					b = sphereB[closestSphereIndex] * illumination;
 				}

					outputBitmapData.setPixel(x, y, (r<<16) + (g<<8) + b);

				} // end if primary ray hit
 		} // end x loop
 	} // end y loop
 	outputBitmapData.unlock();

		// compute FPS
 	var fps:Number = 1.0/((getTimer() - timer) / 1000.0);
 	frameTimeTxt.text = "Drag to rotate. FPS: " + int(fps);
 }

}
}
Friday, March 21st, 2008

I was messing with water effects and Perlin Noise (sandy3d) and some other stuff and collected some water effects and simulations that are fluid like for research, a snapshot of the state of fluid and water effects in 3d in flash.

Ralph Hauwert, of course one of the original pv3d team members, posted some great samples on water effects on 3d objects in Papervision 3D. Of course the papervision list spawned this discussion from another great post on water simulation in papervision and away3d by Exey Panteleev .

Also, some other water like effects from Fabrice Closier and the notorious mrdoob.

Ralph’s Water Effect Demos:

Hey look, the water ball is smiling at you.

Exey Panteleev’s Water Simulation:

Some other Water Like Fluid Effects:

Water is hard in flash. Fluid dynamics will probably have to be cheated but it is still looking pretty good. The amount of processor usage depends on how real you want it to look.

If you are looking to make some agua, with x, the y AND the z in Flash or Flex, these are a good place to start.

Monday, January 14th, 2008


Just recently through the holidays Degrafa has made some great strides as a very cool SVG pathing and designers toolkit for Flex. I have to say some recent Flex apps have really looked good like Picnik and Buzzword but this kit looks to clean up the lack of design and default style-itis that has plagued most common Flex Apps.

This so far looking like a pretty strong kit for bringing the designer pipeline into Flex to provide some really nice looking web styled apps. It has a direct crossover to Silverlight and Path objects that are largely just a series of data created in Expression or exported from Illustrator into XAML. The one benefit of Flex/Flash is it compiles to a very small SWF where with Silverlight you have to package the XAML in a zip and use the downloader object to extract it out. These XAML files and Paths can get massive as I am sure the ones for Degrafa will for Flex but the compile option is nice as it is compressed heavily.

All about Degrafa

Yes the launch includes shiny buttons…

Sphere Sample (right click for source)

Also, it appears it is a way to bridge the pathing and pipeline for flash or Silverlight. At one of the contributors blogs they mention this:

We have lot of interesting features planned for the coming releases. There is also a converter app that will be made available for converting the juicy Degrafa graphics to XAML.

Degrafa has gone live.

Developing…

Thursday, November 22nd, 2007

Andy Zupko is probably doing some of the coolest / useful work in performance and possible effects combining 2D and 3D. Using 2D BitmapData and papervision 3D it turns out you can create a parallel dimension of coolness that cannot fully exist by themselves.

Papervision 2.0 with these effects and if it is as pluggable as it seems is very good for games that lighting is a key component or effects. Imagine a game that can customize weapons with 2d effects in 3d, or rocket boosters, or fireworks or all kinds of inspiring things like changing the mood or environment such as fog, lighting etc… If you start taling about adding physics to all this it just gets too fun. Effects have always been there and around, but making this possible to have a semi-standard way to do this and if it is pluggable, this can lead to many engine advancements.

I think the PV3d team additions of Tim Knip and Andy Zupko have been very good and zupko era in PV3d has begun. Tim Knip is also very active and helping to really organize the ascollada formats and performance stuff like only drawing what is on screen.

Who needs Hydra now? j/k although having this now in papervision leads me to see a very fun 2008 ahead for Flash, it is also, if as pluggable as it seems, a bit like a shaders kit.

All those older great 2d effects merging into 3d from the good old days (some still going very strong) of praystation, yugop, levitated, neave (great 2d tv effects in neave.tv) , flight404 (moved to processing) and many others. And a new era of zupko [pv3d], mr. doob, unitzeroone [pv3d], fabrice [away3d] and many more a new 2d effects in 3d platform is emerging. This kit for papervision3d by zupko and Hydra is making the future glowing full of bright points, and lots of effect explosions.

Let’s hope papervision3d 2.0 it is released soon and it has zupko’s effects code in there.

 

Sunday, November 18th, 2007

Another great new 2D physics engine for AS3 has been released called Box2dFlashAS3 that is based on the excellent kit Box2D for C++. It has been a busy year for physics engines in AS3. FOAM was released this month, APE, the highly anticipated Motor Physics from polygonal labs and plenty more still I am sure.

The Box2dFlashAS3 version has some great demos available on the site that show, use the arrow keys to move to the different demos highlighted here.

  1. bridge
  2. ragdolls
  3. compound shapes
  4. rube goldberg / domino / tank tracks etc
  5. stacked boxes
  6. slider crank / piston
  7. pulleys
  8. gears

Box2DFlashAS3 is an open source port of Erin Catto’s powerful c++ physics library Box2D. Cycle through the demos to see some of the features.

Full source code for the engine and examples can be downloaded from the project’s sourceforge page found Here.

This kit is nice because it mimics Box2D for the crossover and ability of developers to use it in C++ and Flash AS3 moreso than other kits. It looks good and performs well except for a memory or FPS pause I get intermittently.  The demos are already inspiring many uses of the features highlighted for games and effects.