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
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box2d

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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.

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