3D modelling

By Morgan Taylor

3D modelling/design is used because you can test things like if the cart stays on the track of roller coaster, or if all the parts fit together in a car and if they don't then you can change so that they do fit together.
Another reason why 3D modelling/design is used is because it is a lot easier than drawing the product, because if you make a mistake yo would have to start again on paper where as if you did it on a software on a computer or laptop you just change the bit which was wrong.