Render targets are not booleans, this will not work in Dart. Fixed
Render targets are not booleans, this will not work in Dart. Fixed

hirosuke999/three.dart,brason/three.dart,threeDart/three.dart,hirosuke999/three.dart,threeDart/three.dart,brason/three.dart,threeDart/three.dart,brason/three.dart,hirosuke999/three.dart