Many features exist in Adobe Photoshop that most photographers never know exist, Vanishing Point is one of those tools. Many of us have had those moments when we are doing a little retouching on a brick wall and soon realize that if we sample some brick wall from a location on the wall closer to the camera and then try to place those pixels down further away, the size of the bricks is different. This problem is more common than you might think and most photographers who have spent any length of time retouching will know what I mean.
Vanishing Point fixes this issue. The Vanishing Point Filter allows users to "teach" Photoshop where the converging lines are in an image. After teaching Photoshop, you can sample information from one place on wall, and place it down in another location.
In the video below, RMSP Instructor Jeff McLain takes it a step further and actually replaces the texture of a wall using the filter and ensures that the texture scales with the wall. Check it out!