I often create my quick massing volume to scale in VW but the export a perspective image to a sketching app like Sketchbook Pro or Mishief to quickly develop my ideas. The base VW volume geometry helps me to know i'm Sketching ideas to scale. So my wish is that we could have some basic tablet sketching capabilities on the screen plane over our massing models...If the developers are up to it they could even do 3D painting capabilities which would allow to actually paint/sketch on the surface of