Making the rings go away

I'm trying to do the exact thing as the airplane ring simulator but I don't get how. I have a moon roamer go through rings that I want to disappear when driven through. The code is if moon rover is within 2 meters of threshold of torus then torus opacity=0 but when driven through nothing happens. I've tried copying the airplane example but it hasn't worked for me

not sure if you've done this or not but try putting the if statement in an infinite loop so its constantly checking for that and then put that loop in a method that starts when the world does

Thanks so much it worked great!