I have made up 3 quite different scenes in 3 different projects. I think they maybe can be combined into one project (stand a good chance). But unfortunately, they are under different weather conditions and so far i haven't found any methods that can control weather conditions of some certain independent areas in one project. In other words, all i want to make is to connect these 3 scenes (or to switch the scenes )and present in presentation mode, and i wonder that if i can make it in some way, no matter when creating and editing the projecting or when generating the presentation file. Hope that i can hear from you soon. Thanks a looooot!!!!!