webvr js meetup initial commit

node_modules/three/examples/js/geometries/hilbert2D.js

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+/**
+ * Hilbert Curve: Generates 2D-Coordinates in a very fast way.
+ *
+ * @author Dylan Grafmyre
+ *
+ * Based on work by:
+ * @author Thomas Diewald
+ * @link http://www.openprocessing.org/sketch/15493
+ *
+ * @param center     Center of Hilbert curve.
+ * @param size       Total width of Hilbert curve.
+ * @param iterations Number of subdivisions.
+ * @param v0         Corner index -X, -Z.
+ * @param v1         Corner index -X, +Z.
+ * @param v2         Corner index +X, +Z.
+ * @param v3         Corner index +X, -Z.
+ */
+function hilbert2D ( center, size, iterations, v0, v1, v2, v3 ) {
+
+	// Default Vars
+	var center     = undefined !== center ? center : new THREE.Vector3( 0, 0, 0 ),
+		size       = undefined !== size ? size : 10,
+		half       = size / 2,
+		iterations = undefined !== iterations ? iterations : 1,
+		v0 = undefined !== v0 ? v0 : 0,
+		v1 = undefined !== v1 ? v1 : 1,
+		v2 = undefined !== v2 ? v2 : 2,
+		v3 = undefined !== v3 ? v3 : 3
+	;
+
+	var vec_s = [
+		new THREE.Vector3( center.x - half, center.y, center.z - half ),
+		new THREE.Vector3( center.x - half, center.y, center.z + half ),
+		new THREE.Vector3( center.x + half, center.y, center.z + half ),
+		new THREE.Vector3( center.x + half, center.y, center.z - half )
+	];
+
+	var vec = [
+		vec_s[ v0 ],
+		vec_s[ v1 ],
+		vec_s[ v2 ],
+		vec_s[ v3 ]
+	];
+
+	// Recurse iterations
+	if ( 0 <= -- iterations ) {
+
+		var tmp = [];
+
+		Array.prototype.push.apply( tmp, hilbert2D ( vec[ 0 ], half, iterations, v0, v3, v2, v1 ) );
+		Array.prototype.push.apply( tmp, hilbert2D ( vec[ 1 ], half, iterations, v0, v1, v2, v3 ) );
+		Array.prototype.push.apply( tmp, hilbert2D ( vec[ 2 ], half, iterations, v0, v1, v2, v3 ) );
+		Array.prototype.push.apply( tmp, hilbert2D ( vec[ 3 ], half, iterations, v2, v1, v0, v3 ) );
+
+		// Return recursive call
+		return tmp;
+
+	}
+
+	// Return complete Hilbert Curve.
+	return vec;
+
+}