How to fetch child mesh of a .obj? [Solved]

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See image, Suppose in this image three lights are there, 2 sphere and 1 Tours. Now I want to change color of torus grammatically. image.
I fetch the torus
var loader = new THREE.OBJMTLLoader();
loader.load( ‘meshes/objNmtl/sign3.obj’, ‘meshes/objNmtl/sign3.mtl’, function ( object ) {

				object.position.y = 5;
				object.position.z = 5;
				object.rotation.y = 4;
				object.scale.set(0.5,0.5,0.5);
				
				object.traverse( function ( child ) {
					if ( child instanceof THREE.Object3D  ) {
				//		console.log(child.name +"test")
					if(child.name=='Torus'){
						alert("torus");
						console.log(child)
					//	child.material.color.setHex(0xffff00);
					}
					}
				} );
				scene.add( object );
			} );
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