function init() {dm = new ht.DataModel();g3d = new ht.graph3d.Graph3dView(dm);g3d.setGridVisible(true);g3d.addToDOM();g3d.setEye(100, 50, 150);// Define the worldvar gravity = new b2Vec2(0, -100);var doSleep = false;world = new b2World(gravity, doSleep);createNode([0, -3, 0], [100, 6, 100], false, 0);createNode([-100, -50, 0], [400, 6, 100], false, -Math.PI/8);createNode([100, -50, 0], [50, 6, 100], false, Math.PI/6);createNode([1, 50, 0], [10, 10, 10], true);createNode([-1, 90, 0], [10, 10, 10], true);render();
}function createNode(p3, s3, dynamic, angle) {var node = new ht.Node();node.p3(p3);node.s3(s3);               node.setRotationZ(angle == null ? Math.PI * Math.random() : angle);dm.add(node);var fixDef = new b2FixtureDef();if (dynamic) {fixDef.density = 0.5;fixDef.friction = 0.5;fixDef.restitution = 0.5;                    node.s({'all.color': 'red','batch': 'dynamic'});} else {fixDef.density = 0.0;                    }var shape = new b2PolygonShape();shape.SetAsBox(s3[0] / 2, s3[1] / 2);fixDef.shape = shape;var bodyDef = new b2BodyDef();bodyDef.type = dynamic ? b2Body.b2_dynamicBody : b2Body.b2_staticBody;bodyDef.position.Set(p3[0], p3[1]);bodyDef.angle = node.getRotationZ();bodyDef.userData = node;world.CreateBody(bodyDef).CreateFixture(fixDef);
}count = 0
function render() {count++;if(count % 10 === 0){createNode([-1, 50, 0], [10, 10, 10], true);}                world.Step(1 / 60, 10, 10);var list = world.GetBodyList();while (list) {                                              var node = list.m_userData;if(node){var position = list.GetPosition();if(position.y < -150 || g3d.isSelected(node)){dm.remove(node);world.DestroyBody(list);}else{node.p3(position.x, position.y, 0);node.setRotationZ(list.GetAngle());                            }                                              }                    list = list.GetNext();}                    requestAnimationFrame(render);
}