Merge pull request #15994 from garyo/fix/gltf-export-lights-warn

GLTFExporter: improve error message when exporting unsupported light

examples/js/exporters/GLTFExporter.js

@@ -1765,7 +1765,7 @@ THREE.GLTFExporter.prototype = {
 
 			} else if ( object.isLight ) {
 
-				console.warn( 'THREE.GLTFExporter: Only directional, point, and spot lights are supported.' );
+				console.warn( 'THREE.GLTFExporter: Only directional, point, and spot lights are supported.', object );
 				return null;
 
 			}