Added new helpers

src/helpers/Box3Helper.js

@@ -0,0 +1,63 @@
+import { Box3 } from '../math/Box3';
+import { LineSegments } from '../objects/LineSegments';
+import { LineBasicMaterial } from '../materials/LineBasicMaterial';
+import { BufferAttribute } from '../core/BufferAttribute';
+import { BufferGeometry } from '../core/BufferGeometry';
+
+/**
+  * @author WestLangley / http://github.com/WestLangley
+  *
+ */
+
+function Box3Helper( box, hex ) {
+
+	this.type = 'Box3Helper';
+
+	this.box = box;
+
+	var color = ( hex !== undefined ) ? hex : 0xffff00;
+
+	var indices = new Uint16Array( [ 0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7 ] );
+	var positions = new Float32Array( 8 * 3 );
+
+	var geometry = new BufferGeometry();
+	geometry.setIndex( new BufferAttribute( indices, 1 ) );
+	geometry.addAttribute( 'position', new BufferAttribute( positions, 3 ) );
+
+	LineSegments.call( this, geometry, new LineBasicMaterial( { color: color } ) );
+
+	this.update();
+
+}
+
+Box3Helper.prototype = Object.create( LineSegments.prototype );
+Box3Helper.prototype.constructor = Box3Helper;
+
+Box3Helper.prototype.update = function () {
+
+	var box = this.box;
+
+	if ( box.isEmpty() ) return;
+
+	var min = box.min;
+	var max = box.max;
+
+	var position = this.geometry.attributes.position;
+	var array = position.array;
+
+	array[  0 ] = max.x; array[  1 ] = max.y; array[  2 ] = max.z;
+	array[  3 ] = min.x; array[  4 ] = max.y; array[  5 ] = max.z;
+	array[  6 ] = min.x; array[  7 ] = min.y; array[  8 ] = max.z;
+	array[  9 ] = max.x; array[ 10 ] = min.y; array[ 11 ] = max.z;
+	array[ 12 ] = max.x; array[ 13 ] = max.y; array[ 14 ] = min.z;
+	array[ 15 ] = min.x; array[ 16 ] = max.y; array[ 17 ] = min.z;
+	array[ 18 ] = min.x; array[ 19 ] = min.y; array[ 20 ] = min.z;
+	array[ 21 ] = max.x; array[ 22 ] = min.y; array[ 23 ] = min.z;
+
+	position.needsUpdate = true;
+
+	this.geometry.computeBoundingSphere();
+
+};
+
+export { Box3Helper };

src/helpers/PlaneHelper.js

@@ -0,0 +1,53 @@
+import { Box3 } from '../math/Box3';
+import { Line } from '../objects/Line';
+import { LineBasicMaterial } from '../materials/LineBasicMaterial';
+import { Float32BufferAttribute } from '../core/BufferAttribute';
+import { BufferGeometry } from '../core/BufferGeometry';
+
+/**
+  * @author WestLangley / http://github.com/WestLangley
+  *
+ */
+
+function PlaneHelper( plane, size, hex ) {
+
+	this.type = 'PlaneHelper';
+
+	this.plane = plane;
+
+	this.size = size;
+
+	var color = ( hex !== undefined ) ? hex : 0xffff00;
+
+	if ( size === undefined ) size = 1;
+
+	var positions = [ 1, - 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, - 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0 ];
+
+	var geometry = new BufferGeometry();
+
+	geometry.addAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );
+
+	Line.call( this, geometry, new LineBasicMaterial( { color: color } ) );
+
+	this.geometry.computeBoundingSphere();
+
+	this.update();
+
+}
+
+PlaneHelper.prototype = Object.create( Line.prototype );
+PlaneHelper.prototype.constructor = PlaneHelper;
+
+PlaneHelper.prototype.update = function () {
+
+	var scale = - this.plane.constant;
+
+	if ( Math.abs( scale ) < 1e-8 ) scale = 1e-8; // sign does not matter
+
+	this.scale.set( 0.5 * this.size, 0.5 * this.size, scale );
+
+	this.lookAt( this.plane.normal );
+
+};
+
+export { PlaneHelper };