Thanks for all the help. Luckily I don’t have to deal with a windshield. The 3 actors are in the back seat with only int. The green screens out the back and each side window. Three camera positions. The car ext, and green screen footage, will be shot out in the woods without the actors. It’s not on the list but I would like a car ext with an actor in the window as the car moves by. I did some testing and this is what will work for me.
Camera behind a black curtain. A 24mm lens close up on the car windows. About 3’ distance. With only the cars side visible overlaying the trees reflecting is more realistic. I created tracking matts for the windows and the painted areas. With the passing trees opacity set higher on the window glass than the painted areas the effect looks really good. With a couple of grips pushing the car in front of the camera this will be quick, easy and cheep. Thanks again…..