Put real measures in forms imported and placed images.

For example, yogurt pots are built with the pot, the graphics of the pot, the operculum and the transparent plastic cap. Because the shapes are often optimized with other programs, when they are imported sometimes do not have the same size. The typical case, you can see it in the same file when they are "dae" or "3ds": never the same. Why?This fact makes it difficult to make them equal to each other.