Hi Will, thanks for your answer.
I don’t knowr if they are infinite or not, but I guess they are. Same with lines as well. The thing is that they (both planes) need to be parallel , otherwise their distance would be 0 at some point, so all I need is a point of the plane (that can be the center) and then get the plane’s normal and point it to the other plane, so when they intersect we would have the entire vector and that would be the distance, right? My project right now is some kind of a 3D visualizer using VTK, so all I got is VTK objects and thats why I need to use VTK (and also I am supposed to do so, it’s mandatory).
It’s okay if none of these methods take a direction into account, that’s an offset I will think of, but I need some kind of filters or something to kick off.