Using Three.js I have a sphere (globe) and several sprites attached to volcano points. I can rotate (spin) the globe and the sprites stay in their positions because they're added as a group to the sphere.
Now I want to be able to spin the globe to an arbitrary position using a button. How can I do this? For example if the point I want to spin to is at the back of the globe, how can I rotate the globe so it's in the front?
This code is essentially what I have right now. A main mesh which I add sprite to.
<html>
<head></head>
<body>
<script src="three.min.js"></script>
<script>
var scene, camera, renderer;
var geometry, material, mesh;
init();
animate();
function init() {
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.z = 1000;
material = new THREE.MeshBasicMaterial( { color: 0xff0000, wireframe: false } );
geometry = new THREE.SphereGeometry( 159, 32, 32 );
mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
var map = THREE.ImageUtils.loadTexture( "sprite1.png" );
var material2 = new THREE.SpriteMaterial( { map:map, color:0x00ff00 } );
var sprite1 = new THREE.Sprite( material2 );
sprite1.position.set(100,100,100);
sprite1.scale.set(40,40,40);
mesh.add(sprite1);
var sprite2 = new THREE.Sprite( material2);
sprite2.position.set(-100,-100,-100);
sprite2.scale.set(30,30,30);
mesh.add(sprite2);
var sprite3 = new THREE.Sprite(material2);
sprite3.position.set(100,-100,100);
sprite3.scale.set(20,20,20);
mesh.add(sprite3);
renderer = new THREE.WebGLRenderer({alpha:true});
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
}
function animate() {
requestAnimationFrame( animate );
mesh.rotation.y += 0.01;
renderer.render( scene, camera );
}
</script>
</body>
</html>
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