Updated builds.

build/three.js

@@ -27326,6 +27326,13 @@
 	 * @author mrdoob / http://mrdoob.com/
 	 */
 
+	var _instanceLocalMatrix = new Matrix4();
+	var _instanceWorldMatrix = new Matrix4();
+
+	var _instanceIntersects = [];
+
+	var _mesh = new Mesh();
+
 	function InstancedMesh( geometry, material, count ) {
 
 		Mesh.call( this, geometry, material );
@@ -27342,7 +27349,54 @@
 
 		isInstancedMesh: true,
 
-		raycast: function () {},
+		getMatrixAt: function ( index, matrix ) {
+
+			matrix.fromArray( this.instanceMatrix.array, index * 16 );
+
+		},
+
+		raycast: function ( raycaster, intersects ) {
+
+			var matrixWorld = this.matrixWorld;
+			var raycastTimes = this.count;
+
+			_mesh.geometry = this.geometry;
+			_mesh.material = this.material;
+
+			if ( _mesh.material === undefined ) { return; }
+
+			for ( var instanceId = 0; instanceId < raycastTimes; instanceId ++ ) {
+
+				//Calculate the world matrix for each instance
+
+				this.getMatrixAt( instanceId, _instanceLocalMatrix );
+
+				_instanceWorldMatrix.multiplyMatrices( matrixWorld, _instanceLocalMatrix );
+
+
+				//The mesh represents this single instance
+
+				_mesh.matrixWorld = _instanceWorldMatrix;
+
+				_mesh.raycast( raycaster, _instanceIntersects );
+
+
+				//Process the result of raycast
+
+				if ( _instanceIntersects.length > 0 ) {
+
+					_instanceIntersects[ 0 ].instanceId = instanceId;
+					_instanceIntersects[ 0 ].object = this;
+
+					intersects.push( _instanceIntersects[ 0 ] );
+
+					_instanceIntersects.length = 0;
+
+				}
+
+			}
+
+		},
 
 		setMatrixAt: function ( index, matrix ) {
 
@@ -27350,7 +27404,9 @@
 
 		},
 
-		updateMorphTargets: function () {}
+		updateMorphTargets: function () {
+
+		}
 
 	} );
 

build/three.module.js

@@ -27318,6 +27318,13 @@ Bone.prototype = Object.assign( Object.create( Object3D.prototype ), {
  * @author mrdoob / http://mrdoob.com/
  */
 
+var _instanceLocalMatrix = new Matrix4();
+var _instanceWorldMatrix = new Matrix4();
+
+var _instanceIntersects = [];
+
+var _mesh = new Mesh();
+
 function InstancedMesh( geometry, material, count ) {
 
 	Mesh.call( this, geometry, material );
@@ -27334,7 +27341,54 @@ InstancedMesh.prototype = Object.assign( Object.create( Mesh.prototype ), {
 
 	isInstancedMesh: true,
 
-	raycast: function () {},
+	getMatrixAt: function ( index, matrix ) {
+
+		matrix.fromArray( this.instanceMatrix.array, index * 16 );
+
+	},
+
+	raycast: function ( raycaster, intersects ) {
+
+		var matrixWorld = this.matrixWorld;
+		var raycastTimes = this.count;
+
+		_mesh.geometry = this.geometry;
+		_mesh.material = this.material;
+
+		if ( _mesh.material === undefined ) return;
+
+		for ( var instanceId = 0; instanceId < raycastTimes; instanceId ++ ) {
+
+			//Calculate the world matrix for each instance
+
+			this.getMatrixAt( instanceId, _instanceLocalMatrix );
+
+			_instanceWorldMatrix.multiplyMatrices( matrixWorld, _instanceLocalMatrix );
+
+
+			//The mesh represents this single instance
+
+			_mesh.matrixWorld = _instanceWorldMatrix;
+
+			_mesh.raycast( raycaster, _instanceIntersects );
+
+
+			//Process the result of raycast
+
+			if ( _instanceIntersects.length > 0 ) {
+
+				_instanceIntersects[ 0 ].instanceId = instanceId;
+				_instanceIntersects[ 0 ].object = this;
+
+				intersects.push( _instanceIntersects[ 0 ] );
+
+				_instanceIntersects.length = 0;
+
+			}
+
+		}
+
+	},
 
 	setMatrixAt: function ( index, matrix ) {
 
@@ -27342,7 +27396,9 @@ InstancedMesh.prototype = Object.assign( Object.create( Mesh.prototype ), {
 
 	},
 
-	updateMorphTargets: function () {}
+	updateMorphTargets: function () {
+
+	}
 
 } );