webvr js meetup initial commit

node_modules/three/examples/js/nodes/utils/VelocityNode.js

@@ -0,0 +1,59 @@
+/**
+ * @author sunag / http://www.sunag.com.br/
+ */
+
+THREE.VelocityNode = function( target, params ) {
+
+	THREE.Vector3Node.call( this );
+
+	this.requestUpdate = true;
+
+	this.target = target;
+
+	this.position = this.target.position.clone();
+	this.velocity = new THREE.Vector3();
+	this.moment = new THREE.Vector3();
+
+	this.params = params || {};
+
+};
+
+THREE.VelocityNode.prototype = Object.create( THREE.Vector3Node.prototype );
+THREE.VelocityNode.prototype.constructor = THREE.VelocityNode;
+
+THREE.VelocityNode.prototype.updateFrame = function( delta ) {
+
+	this.velocity.subVectors( this.target.position, this.position );
+	this.position.copy( this.target.position );
+
+	switch ( this.params.type ) {
+
+		case "elastic":
+
+			delta *= this.params.fps || 60;
+
+			var spring = Math.pow( this.params.spring, delta );
+			var friction = Math.pow( this.params.friction, delta );
+
+			// spring
+			this.moment.x += this.velocity.x * spring;
+			this.moment.y += this.velocity.y * spring;
+			this.moment.z += this.velocity.z * spring;
+
+			// friction
+			this.moment.x *= friction;
+			this.moment.y *= friction;
+			this.moment.z *= friction;
+
+			this.value.copy( this.moment );
+
+			break;
+
+		default:
+
+			this.value.copy( this.velocity );
+
+			break;
+	}
+
+};