I wanted to know how the effect is done when a camera is panning or dollying. example: from left to right, and there happens to be a pillar
or any object comes into view, but before the camera can dolly or pan past it, it's in a different room continuing the pan... (does this make any sense? It's really hard to describe in words). A better example is probably... a camera dollying outside a building, it goes through the brick wall and into a room, but it all looks like one seemless shot.(All from a side point of view.) help?

first get two dolly shots (one for each side of the pillar or wall) matching in speed and direction as closely as possible and ending and beginning (respectively) with some sort of obstruction. then try to merge them with either a wipe transition, cross fade, or a manual keyframed crop. i bet if you're clever enough with the crop the second cut doesn't need a pillar in the beginning.

Usually it's a wipe. But since the obstruction in the foreground is almost always very dark, you don't see the seam of the wipe putting the two shots together.

They do this a lot in reality shows when people are talking in a restaurant. Sometimes when the conversation isn't very interesting, they'll have the footage of someone crossing in front of a camera, usually a waiter, (which you would expect in a reality show in a public place), but it's so close to camera it's fast and blurry.

Then you wipe between the two scenes, and you hide the seam of the wipe behind the footage of the waiter passing by. You can notice it because usually the waiter wil pass by, but their plates will be different, or the positions they were sitting in. Sometimes you can hear the sound take a little dip as they try to hide the cut.

Music videos use it a lot now too I've noticed. Like hip hop videos when they have a lot of coreography and they want to cut from one take to another, they'll have footage of a dancer (or if it's a public place like a street or school of a random passer=by) pass in front of the camera so they can hide the cut.

It kind of seems weird that in such a controled enviroment like a music video, they'd let a dancer/random person walk in front of the camera, but if you watch closely you notice the cut.

Good luck with your shooting.