Box2Dweb very slow on node.js

Posted by Peteris on Game Development See other posts from Game Development or by Peteris
Published on 2012-03-30T08:46:47Z Indexed on 2012/03/30 11:42 UTC
Read the original article Hit count: 202

Filed under:

box2d

|

node.js

I'm using Box2Dweb on node.js. I have a rotated box object that I apply an impulse to move around. The timestep is set at 50ms, however, it bumps up to 100ms and even 200ms as soon as I add any more edges or boxes. Here are the edges I would like to use as bounds around the playing area:

// Computing the corners
var upLeft    = new b2Vec2(0, 0),
    lowLeft   = new b2Vec2(0, height),
    lowRight  = new b2Vec2(width, height),
    upRight   = new b2Vec2(width, 0)

// Edges bounding the visible game area
var edgeFixDef = new b2FixtureDef
edgeFixDef.friction    = 0.5
edgeFixDef.restitution = 0.2
edgeFixDef.shape = new b2PolygonShape

var edgeBodyDef = new b2BodyDef;
edgeBodyDef.type = b2Body.b2_staticBody 

edgeFixDef.shape.SetAsEdge(upLeft, lowLeft)
world.CreateBody(edgeBodyDef).CreateFixture(edgeFixDef)

edgeFixDef.shape.SetAsEdge(lowLeft, lowRight)
world.CreateBody(edgeBodyDef).CreateFixture(edgeFixDef)

edgeFixDef.shape.SetAsEdge(lowRight, upRight)
world.CreateBody(edgeBodyDef).CreateFixture(edgeFixDef)

edgeFixDef.shape.SetAsEdge(upRight, upLeft)
world.CreateBody(edgeBodyDef).CreateFixture(edgeFixDef)

Can box2d really become this slow for even two bodies or is there some pitfall? It would be very surprising given all the demos which successfully use tens of objects.

© Game Development or respective owner

Related posts about box2d

Box2D Joints in entity components system

as seen on Game Development - Search for 'Game Development'
I search a way to have Box2D joints in an entity component system, here is what i found : 1) Having the joints in Box2D/Body component as parameters, we have a joint array with an ID by joint and having in the other body component the same joint ID, like in this example : Entity1 - Box2D/Body component… >>> More
Box 2d basic questions

as seen on Game Development - Search for 'Game Development'
I am a bit new to box2d and I am developing an game with type and letters. I am using an svg font and generate the box2d bodies direct from the glyphs path definition, using the convex hull of them. I also have an decomposition routine the decomposes this hull if necessary. All this it is more or… >>> More
simple collision detection with box2dweb

as seen on Game Development - Search for 'Game Development'
im beginner in box2dweb that version of box2d for javascript i wrote simple gravity system and i want to detect the collision between the box and the ground , when the falling box hit the ground execute simple function like function sucs(){alert("the box on the floor !")}; this is my code var… >>> More
box2D simulation doesn't work

as seen on Game Development - Search for 'Game Development'
has been a while since last time i used box2D, and i needed to make some stuff, and i saw that my simulation don't worked (compiles, but do anything). i haven't been able to even have working the examples or this simple example i'm pasting below: package { import flash.display.Sprite; import… >>> More
Box2d: Set active and inactive

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm writing an XNA game in C# using the XNA port of Box2d - Box2dx. Entities like trees or zombies are represented as GameObjects. GameObjectManager adds and removes them from the game world: /// <summary> /// Does the work of removing the GameObject. /// </summary> ///… >>> More

Related posts about node.js

Node.js Adventure - Node.js on Windows

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Two weeks ago I had had a talk with Wang Tao, a C# MVP in China who is currently running his startup company and product named worktile. He asked me to figure out a synchronization solution which helps his product in the future. And he preferred me implementing the service in Node.js, since his worktile… >>> More
Node.js Adventure - Host Node.js on Windows Azure Worker Role

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
In my previous post I demonstrated about how to develop and deploy a Node.js application on Windows Azure Web Site (a.k.a. WAWS). WAWS is a new feature in Windows Azure platform. Since it’s low-cost, and it provides IIS and IISNode components so that we can host our Node.js application though Git… >>> More
Sending data through POST request from a node.js server to a node.js server

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to send data through a POST request from a node.js server to another node.js server. What I do in the "client" node.js is the following: var options = { host: 'my.url', port: 80, path: '/login', method: 'POST' }; var req = http.request(options, function(res){ console… >>> More
node.js on multi-core machines

as seen on Stack Overflow - Search for 'Stack Overflow'
node.js looks interesting BUT... I must miss something - isn't node.js tuned only to run on a single process & thread? Then how does it scale for multi-core CPUs and multi-CPU servers? After all, it is all great to make fast as possible single-thread server, but for high loads I would want to… >>> More
Node.js as a custom (streaming) upload handler for Django

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to build an upload-centric app using Django. One way to do this is with nginx's upload module (nonblocking) but it has its problems. Node.js is supposed to be a good candidate for this type of application. But how can I make node.js act as an upload_handler() for Django (http://docs.djangoproject… >>> More