Object3D add() can take arbitrary arguments and is chainable.

Now is possible to do:

    obj.add( obj2, obj3 );

As well as:

    obj.add( obj2 ).add( obj3 );

Fixes #4958.

build/three.js

@@ -7360,10 +7360,22 @@ THREE.Object3D.prototype = {
 
 	add: function ( object ) {
 
+		if ( arguments.length > 1 ) {
+
+			for ( var i = 0; i < arguments.length; i++ ) {
+
+				this.add( arguments[ i ] );
+
+			}
+
+			return this;
+
+		};
+
 		if ( object === this ) {
 
 			console.warn( "THREE.Object3D.add: An object can't be added as a child of itself." );
-			return;
+			return this;
 
 		}
 
@@ -7398,6 +7410,8 @@ THREE.Object3D.prototype = {
 
 		}
 
+		return this;
+
 	},
 
 	remove: function ( object ) {

build/three.min.js

@@ -148,12 +148,12 @@ THREE.Object3D.prototype={constructor:THREE.Object3D,get eulerOrder(){console.wa
 applyMatrix:function(a){this.matrix.multiplyMatrices(a,this.matrix);this.matrix.decompose(this.position,this.quaternion,this.scale)},setRotationFromAxisAngle:function(a,b){this.quaternion.setFromAxisAngle(a,b)},setRotationFromEuler:function(a){this.quaternion.setFromEuler(a,!0)},setRotationFromMatrix:function(a){this.quaternion.setFromRotationMatrix(a)},setRotationFromQuaternion:function(a){this.quaternion.copy(a)},rotateOnAxis:function(){var a=new THREE.Quaternion;return function(b,c){a.setFromAxisAngle(b,
 c);this.quaternion.multiply(a);return this}}(),rotateX:function(){var a=new THREE.Vector3(1,0,0);return function(b){return this.rotateOnAxis(a,b)}}(),rotateY:function(){var a=new THREE.Vector3(0,1,0);return function(b){return this.rotateOnAxis(a,b)}}(),rotateZ:function(){var a=new THREE.Vector3(0,0,1);return function(b){return this.rotateOnAxis(a,b)}}(),translateOnAxis:function(){var a=new THREE.Vector3;return function(b,c){a.copy(b).applyQuaternion(this.quaternion);this.position.add(a.multiplyScalar(c));
 return this}}(),translate:function(a,b){console.warn("THREE.Object3D: .translate() has been removed. Use .translateOnAxis( axis, distance ) instead.");return this.translateOnAxis(b,a)},translateX:function(){var a=new THREE.Vector3(1,0,0);return function(b){return this.translateOnAxis(a,b)}}(),translateY:function(){var a=new THREE.Vector3(0,1,0);return function(b){return this.translateOnAxis(a,b)}}(),translateZ:function(){var a=new THREE.Vector3(0,0,1);return function(b){return this.translateOnAxis(a,
-b)}}(),localToWorld:function(a){return a.applyMatrix4(this.matrixWorld)},worldToLocal:function(){var a=new THREE.Matrix4;return function(b){return b.applyMatrix4(a.getInverse(this.matrixWorld))}}(),lookAt:function(){var a=new THREE.Matrix4;return function(b){a.lookAt(b,this.position,this.up);this.quaternion.setFromRotationMatrix(a)}}(),add:function(a){if(a===this)console.warn("THREE.Object3D.add: An object can't be added as a child of itself.");else if(a instanceof THREE.Object3D){void 0!==a.parent&&
-a.parent.remove(a);a.parent=this;a.dispatchEvent({type:"added"});this.children.push(a);for(var b=this;void 0!==b.parent;)b=b.parent;void 0!==b&&b instanceof THREE.Scene&&b.__addObject(a)}},remove:function(a){var b=this.children.indexOf(a);if(-1!==b){a.parent=void 0;a.dispatchEvent({type:"removed"});this.children.splice(b,1);for(b=this;void 0!==b.parent;)b=b.parent;void 0!==b&&b instanceof THREE.Scene&&b.__removeObject(a)}},raycast:function(){},traverse:function(a){a(this);for(var b=0,c=this.children.length;b<
-c;b++)this.children[b].traverse(a)},getObjectById:function(a,b){for(var c=0,d=this.children.length;c<d;c++){var e=this.children[c];if(e.id===a||!0===b&&(e=e.getObjectById(a,b),void 0!==e))return e}},getObjectByName:function(a,b){for(var c=0,d=this.children.length;c<d;c++){var e=this.children[c];if(e.name===a||!0===b&&(e=e.getObjectByName(a,b),void 0!==e))return e}},getChildByName:function(a,b){console.warn("THREE.Object3D: .getChildByName() has been renamed to .getObjectByName().");return this.getObjectByName(a,
-b)},updateMatrix:function(){this.matrix.compose(this.position,this.quaternion,this.scale);this.matrixWorldNeedsUpdate=!0},updateMatrixWorld:function(a){!0===this.matrixAutoUpdate&&this.updateMatrix();if(!0===this.matrixWorldNeedsUpdate||!0===a)void 0===this.parent?this.matrixWorld.copy(this.matrix):this.matrixWorld.multiplyMatrices(this.parent.matrixWorld,this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b=0,c=this.children.length;b<c;b++)this.children[b].updateMatrixWorld(a)},clone:function(a,
-b){void 0===a&&(a=new THREE.Object3D);void 0===b&&(b=!0);a.name=this.name;a.up.copy(this.up);a.position.copy(this.position);a.quaternion.copy(this.quaternion);a.scale.copy(this.scale);a.renderDepth=this.renderDepth;a.rotationAutoUpdate=this.rotationAutoUpdate;a.matrix.copy(this.matrix);a.matrixWorld.copy(this.matrixWorld);a.matrixAutoUpdate=this.matrixAutoUpdate;a.matrixWorldNeedsUpdate=this.matrixWorldNeedsUpdate;a.visible=this.visible;a.castShadow=this.castShadow;a.receiveShadow=this.receiveShadow;
-a.frustumCulled=this.frustumCulled;a.userData=JSON.parse(JSON.stringify(this.userData));if(!0===b)for(var c=0;c<this.children.length;c++)a.add(this.children[c].clone());return a}};THREE.EventDispatcher.prototype.apply(THREE.Object3D.prototype);THREE.Object3DIdCount=0;THREE.Projector=function(){function a(){if(p===r){var a=new THREE.RenderableVertex;q.push(a);r++;p++;return a}return q[p++]}function b(){if(s===v){var a=new THREE.RenderableFace;n.push(a);v++;s++;return a}return n[s++]}function c(){if(u===K){var a=new THREE.RenderableLine;x.push(a);K++;u++;return a}return x[u++]}function d(a,b){return a.z!==b.z?b.z-a.z:a.id!==b.id?a.id-b.id:0}function e(a,b){var c=0,d=1,e=a.z+a.w,f=b.z+b.w,g=-a.z+a.w,h=-b.z+b.w;if(0<=e&&0<=f&&0<=g&&0<=h)return!0;if(0>e&&0>f||0>g&&
+b)}}(),localToWorld:function(a){return a.applyMatrix4(this.matrixWorld)},worldToLocal:function(){var a=new THREE.Matrix4;return function(b){return b.applyMatrix4(a.getInverse(this.matrixWorld))}}(),lookAt:function(){var a=new THREE.Matrix4;return function(b){a.lookAt(b,this.position,this.up);this.quaternion.setFromRotationMatrix(a)}}(),add:function(a){if(1<arguments.length){for(var b=0;b<arguments.length;b++)this.add(arguments[b]);return this}if(a===this)return console.warn("THREE.Object3D.add: An object can't be added as a child of itself."),
+this;if(a instanceof THREE.Object3D){void 0!==a.parent&&a.parent.remove(a);a.parent=this;a.dispatchEvent({type:"added"});this.children.push(a);for(b=this;void 0!==b.parent;)b=b.parent;void 0!==b&&b instanceof THREE.Scene&&b.__addObject(a)}return this},remove:function(a){var b=this.children.indexOf(a);if(-1!==b){a.parent=void 0;a.dispatchEvent({type:"removed"});this.children.splice(b,1);for(b=this;void 0!==b.parent;)b=b.parent;void 0!==b&&b instanceof THREE.Scene&&b.__removeObject(a)}},raycast:function(){},
+traverse:function(a){a(this);for(var b=0,c=this.children.length;b<c;b++)this.children[b].traverse(a)},getObjectById:function(a,b){for(var c=0,d=this.children.length;c<d;c++){var e=this.children[c];if(e.id===a||!0===b&&(e=e.getObjectById(a,b),void 0!==e))return e}},getObjectByName:function(a,b){for(var c=0,d=this.children.length;c<d;c++){var e=this.children[c];if(e.name===a||!0===b&&(e=e.getObjectByName(a,b),void 0!==e))return e}},getChildByName:function(a,b){console.warn("THREE.Object3D: .getChildByName() has been renamed to .getObjectByName().");
+return this.getObjectByName(a,b)},updateMatrix:function(){this.matrix.compose(this.position,this.quaternion,this.scale);this.matrixWorldNeedsUpdate=!0},updateMatrixWorld:function(a){!0===this.matrixAutoUpdate&&this.updateMatrix();if(!0===this.matrixWorldNeedsUpdate||!0===a)void 0===this.parent?this.matrixWorld.copy(this.matrix):this.matrixWorld.multiplyMatrices(this.parent.matrixWorld,this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b=0,c=this.children.length;b<c;b++)this.children[b].updateMatrixWorld(a)},
+clone:function(a,b){void 0===a&&(a=new THREE.Object3D);void 0===b&&(b=!0);a.name=this.name;a.up.copy(this.up);a.position.copy(this.position);a.quaternion.copy(this.quaternion);a.scale.copy(this.scale);a.renderDepth=this.renderDepth;a.rotationAutoUpdate=this.rotationAutoUpdate;a.matrix.copy(this.matrix);a.matrixWorld.copy(this.matrixWorld);a.matrixAutoUpdate=this.matrixAutoUpdate;a.matrixWorldNeedsUpdate=this.matrixWorldNeedsUpdate;a.visible=this.visible;a.castShadow=this.castShadow;a.receiveShadow=
+this.receiveShadow;a.frustumCulled=this.frustumCulled;a.userData=JSON.parse(JSON.stringify(this.userData));if(!0===b)for(var c=0;c<this.children.length;c++)a.add(this.children[c].clone());return a}};THREE.EventDispatcher.prototype.apply(THREE.Object3D.prototype);THREE.Object3DIdCount=0;THREE.Projector=function(){function a(){if(p===r){var a=new THREE.RenderableVertex;q.push(a);r++;p++;return a}return q[p++]}function b(){if(s===v){var a=new THREE.RenderableFace;n.push(a);v++;s++;return a}return n[s++]}function c(){if(u===K){var a=new THREE.RenderableLine;x.push(a);K++;u++;return a}return x[u++]}function d(a,b){return a.z!==b.z?b.z-a.z:a.id!==b.id?a.id-b.id:0}function e(a,b){var c=0,d=1,e=a.z+a.w,f=b.z+b.w,g=-a.z+a.w,h=-b.z+b.w;if(0<=e&&0<=f&&0<=g&&0<=h)return!0;if(0>e&&0>f||0>g&&
 0>h)return!1;0>e?c=Math.max(c,e/(e-f)):0>f&&(d=Math.min(d,e/(e-f)));0>g?c=Math.max(c,g/(g-h)):0>h&&(d=Math.min(d,g/(g-h)));if(d<c)return!1;a.lerp(b,c);b.lerp(a,1-d);return!0}var f,g,h=[],k=0,l,p,q=[],r=0,t,s,n=[],v=0,w,u,x=[],K=0,A,G,B=[],C=0,E={objects:[],lights:[],elements:[]},H=new THREE.Vector3,y=new THREE.Vector3,Q=new THREE.Vector3,z=new THREE.Vector3,R=new THREE.Vector4,L=new THREE.Box3(new THREE.Vector3(-1,-1,-1),new THREE.Vector3(1,1,1)),I=new THREE.Box3,F=Array(3),P=new THREE.Matrix4,X=
 new THREE.Matrix4,N,la=new THREE.Matrix4,S=new THREE.Matrix3,W=new THREE.Frustum,D=new THREE.Vector4,ha=new THREE.Vector4;this.projectVector=function(a,b){b.matrixWorldInverse.getInverse(b.matrixWorld);X.multiplyMatrices(b.projectionMatrix,b.matrixWorldInverse);return a.applyProjection(X)};this.unprojectVector=function(){var a=new THREE.Matrix4;return function(b,c){a.getInverse(c.projectionMatrix);X.multiplyMatrices(c.matrixWorld,a);return b.applyProjection(X)}}();this.pickingRay=function(a,b){a.z=
 -1;var c=new THREE.Vector3(a.x,a.y,1);this.unprojectVector(a,b);this.unprojectVector(c,b);c.sub(a).normalize();return new THREE.Raycaster(a,c)};var fa=function(a){if(!1!==a.visible){if(a instanceof THREE.Light)E.lights.push(a);else if(a instanceof THREE.Mesh||a instanceof THREE.Line||a instanceof THREE.Sprite)if(!1===a.frustumCulled||!0===W.intersectsObject(a)){if(g===k){var b=new THREE.RenderableObject;h.push(b);k++;g++;f=b}else f=h[g++];f.id=a.id;f.object=a;null!==a.renderDepth?f.z=a.renderDepth:

examples/canvas_geometry_nurbs.html

@@ -108,7 +108,6 @@
 
 				var nurbsLine = new THREE.Line( nurbsGeometry, nurbsMaterial );
 				nurbsLine.position.set( 0, -100, 0 );
-				group.add( nurbsLine );
 
 				var nurbsControlPointsGeometry = new THREE.Geometry();
 				nurbsControlPointsGeometry.vertices = nurbsCurve.controlPoints;
@@ -116,7 +115,10 @@
 
 				var nurbsControlPointsLine = new THREE.Line( nurbsControlPointsGeometry, nurbsControlPointsMaterial );
 				nurbsControlPointsLine.position.copy( nurbsLine.position );
-				group.add( nurbsControlPointsLine );
+
+				group.add( nurbsLine, nurbsControlPointsLine );
+				// this also works:
+				// group.add( nurbsLine ).add( nurbsControlPointsLine );
 
 				//
 

src/core/Object3D.js

@@ -297,10 +297,22 @@ THREE.Object3D.prototype = {
 
 	add: function ( object ) {
 
+		if ( arguments.length > 1 ) {
+
+			for ( var i = 0; i < arguments.length; i++ ) {
+
+				this.add( arguments[ i ] );
+
+			}
+
+			return this;
+
+		};
+
 		if ( object === this ) {
 
 			console.warn( "THREE.Object3D.add: An object can't be added as a child of itself." );
-			return;
+			return this;
 
 		}
 
@@ -335,6 +347,8 @@ THREE.Object3D.prototype = {
 
 		}
 
+		return this;
+
 	},
 
 	remove: function ( object ) {