# How to make ball bouncy in matterjs

Hi I adapted this snippet of code from here However, despite the restitution, the objects aren’t bouncy at all. Is there anything I need to change?

``````// This example is based on examples from: http://brm.io/matter-js/

var Engine = Matter.Engine;
var Render = Matter.Render;
var World = Matter.World;
var Bodies = Matter.Bodies;
var Composite = Matter.Composite;

var engine;

var boxA;
var boxB;
var ground;

function setup() {
createCanvas(800, 600);

// create an engine
engine = Engine.create();

let options = {
isStatic: true,
restitution: 0.8
}
// create two boxes and a ground
boxA = Bodies.rectangle(400, 200, 80, 80);
//boxB = Bodies.circle(490, 50, 80, 80);
boxB = Bodies.circle(490, 50, 20, 20);
ground = Bodies.rectangle(400, 610, 810, 60, options);

// run the engine
Engine.run(engine);
}

// Using p5 to render
function draw() {

// var bodies = Composite.allBodies(engine.world);

background(51);

var vertices = boxA.vertices;
fill(255);
beginShape();
for (var i = 0; i < vertices.length; i++) {
vertex(vertices[i].x, vertices[i].y);
}
endShape();

// boxB vertices
var vertices = boxB.vertices;
fill(255);
beginShape();
for (var i = 0; i < vertices.length; i++) {
vertex(vertices[i].x, vertices[i].y);
}
endShape();

// Ground vertices
var vertices = ground.vertices;
beginShape();
fill(127);
for (var i = 0; i < vertices.length; i++) {
vertex(vertices[i].x, vertices[i].y);
}
endShape();
}
``````
1 Like

if you go
https://github.com/shiffman/p5-matter and

• unzip it to any directory
• go down to
…\p5-matter-master\01_basics\
• double click index.html

i think you get what it is supposed to do??
( test under win7 / 64bit // firefox browser )

so can you tell us what/HOW you try to do it,