Sure, here are "Hello, World!" examples for Paper and Three:

Paper:


```javascript
var canvas = document.getElementById('myCanvas');
paper.setup(canvas);
var text = new paper.PointText(new paper.Point(50, 50));
text.justification = 'center';
text.fillColor = 'black';
text.fontSize = 20;
text.content = 'Hello, World!';
```
In this code, we're creating a PointText object and setting various properties like its position, size, and content. We're then using Paper's setup method to initialize the canvas, and finally adding our text to the canvas.


Three:

```javascript
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );

var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );

var geometry = new THREE.BoxGeometry();
var material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
var cube = new THREE.Mesh( geometry, material );
scene.add( cube );

camera.position.z = 5;

function animate() {
	requestAnimationFrame( animate );
	renderer.render( scene, camera );
}
animate();
```
In this code, we're creating a simple 3D scene with a green cube using Three.js. We're setting up a scene, camera, renderer, and adding the cube mesh to the scene. We're then setting the camera position and adding an animation loop to render the scene using the renderer.
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