webvr js meetup initial commit

node_modules/three/examples/js/curves/NURBSSurface.js

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+/**
+ * @author renej
+ * NURBS surface object
+ *
+ * Implementation is based on (x, y [, z=0 [, w=1]]) control points with w=weight.
+ *
+ **/
+
+
+/**************************************************************
+ *	NURBS surface
+ **************************************************************/
+
+THREE.NURBSSurface = function ( degree1, degree2, knots1, knots2 /* arrays of reals */, controlPoints /* array^2 of Vector(2|3|4) */ ) {
+
+	this.degree1 = degree1;
+	this.degree2 = degree2;
+	this.knots1 = knots1;
+	this.knots2 = knots2;
+	this.controlPoints = [];
+
+	var len1 = knots1.length - degree1 - 1;
+	var len2 = knots2.length - degree2 - 1;
+
+	// ensure Vector4 for control points
+	for ( var i = 0; i < len1; ++ i ) {
+
+		this.controlPoints[ i ] = [];
+		for ( var j = 0; j < len2; ++ j ) {
+
+			var point = controlPoints[ i ][ j ];
+			this.controlPoints[ i ][ j ] = new THREE.Vector4( point.x, point.y, point.z, point.w );
+
+		}
+
+	}
+
+};
+
+
+THREE.NURBSSurface.prototype = {
+
+	constructor: THREE.NURBSSurface,
+
+	getPoint: function ( t1, t2 ) {
+
+		var u = this.knots1[ 0 ] + t1 * ( this.knots1[ this.knots1.length - 1 ] - this.knots1[ 0 ] ); // linear mapping t1->u
+		var v = this.knots2[ 0 ] + t2 * ( this.knots2[ this.knots2.length - 1 ] - this.knots2[ 0 ] ); // linear mapping t2->u
+
+		return THREE.NURBSUtils.calcSurfacePoint( this.degree1, this.degree2, this.knots1, this.knots2, this.controlPoints, u, v );
+
+	}
+};
+
+