In Thailand, I took a photo and take it to make Tornado effect scene. This project is created by Maya2008, Particle and Particle Instancer, control particle by Expression(MEL Script). By checking distance between particle instancer(wood, roof, window this house) and Locator that move along Tornado. First, Model windows swing with Expression(MEL) and switch to move along particle when impacted by Tornado. Rendered by mentalray and composited by AfterEffect.