instead of changing to the griffindor flag shown in this video Gryffindor Wins the House Cup - Harry Potter and the Philosopher's Stone. - YouTube , if i wanted it to change to another flag like a pirate flag, how difficult would it be to do? and how would i go about doing it?
i saw some videos where 2 masks are created, 1 on the object before transformation and the other for the object after....and then use the morph effect but idk if that would work here with how the flags are moving
In order to reproduce this shot exactly you need to carefully plan and photograph a clean plate that has no flags in the shot. Once you have the clean plate you can start planning your 3-D elements. The easiest way is to create and animate the flags 3-D application and animate the texture map. This will require a knowledge of fabric simulation, modeling, texturing, and matching camera angles.
There is no easy way to do this in AE directly without purchasing a third-party plug-in such as Zaxwerks Flag, Freeform Pro, or Element 3D. Unfortunately C4D lite does not have the modeling chops to animate a flag. Doing this entirely inside AE even with an expensive third-party plug-in is going to require a lot of skill and understanding. There is no push the button solution to this kind of a problem.
If you already have a shot with flags then we need to see the shot to have any chance of coming up with a viable solution. A shot that already contains flags is going to be a lot more difficult to work with.