A method and an apparatus are disclosed for displaying to a user a transition between a first rendered projection of a first image data and a final rendered projection of a second image data, the method comprising obtaining said first image data and said second image data, each generated by a corresponding 3D scanning device scanning a structure； displaying a first view corresponding to a first rendered projection of said first image data in a given window； obtaining an input from the user, said input being indicative of said final rendered projection of a portion of said second image data and displaying in sequence a plurality of views in the given window, each view corresponding to a different rendered projection of at least one of the first image data and the second image data, wherein the plurality of rendered projections are defined so as to perform a transition between the first rendered projection and the final rendered projection, further wherein the transition enables a sequential display of a continuity of information of said structure from said first image data to said portion of said second image data, further wherein at least one of said first rendered projection and said final rendered projection are defined according to a different spatial arrangement and said first image data and said second image data are generated by different 3D scanning devices.
