1. A method for performing an image-editing operation, comprising: performing by a computer: mapping a source area which spans a plurality of perspective planes to a destination area which spans one or more perspective planes, comprising: defining a plurality of partial source areas within the source area, wherein each of the plurality of partial source areas comprises a respective two-dimensional surface and is oriented within a respective one of the plurality of perspective planes spanned by the source area; and defining a plurality of partial destination areas within the destination area, wherein each of the plurality of partial destination areas comprises a respective two-dimensional surface and corresponds to a respective one of the plurality of partial source areas, and wherein the plurality of partial destination areas are oriented within the one or more perspective planes spanned by the destination area; or mapping a source area which spans one or more perspective planes to a destination area which spans a plurality of perspective planes, comprising: defining a plurality of partial destination areas within the destination area, wherein each of the plurality of partial destination areas comprises a respective two-dimensional surface and is oriented within a respective one of the plurality of perspective planes spanned by the destination area; and defining a plurality of partial source areas within the source area, wherein each of the plurality of partial source areas comprises a respective two-dimensional surface and corresponds to a respective one of the plurality of partial destination areas, and wherein the plurality of partial source areas are oriented within the one or more perspective planes spanned by the source area; and applying the image-editing operation from each partial source area to each corresponding partial destination area; wherein defining the plurality of partial source areas comprises clipping the source area to one of the perspective planes spanned by the destination area, or wherein defining the plurality of partial destination areas comprises clipping the destination area to one of the perspective planes spanned by the source area.