1. An imaging apparatus for composing a display image of a three-dimensional polygon object generated in a virtual reality space, projected onto a plane in a view-point coordinate system, comprising: a texture image storage device for storing the image of the three-dimensional polygon object viewed in a depth direction from an original view-point, as a texture image; a three-dimensional positional detecting device for inputting changes in said original angle of view; and a display image generating device which, based on changes in view angle from said original view-point, generates a display image by appropriately dividing a polygon plane onto which a texture image is mapped, and by moving, on said polygon plane, an apex being generated as a result of division, so that the perspective of the image viewed in the depth direction after the chances in view angle are aligned with the perspective of said three-dimensional polygon object previously viewed in the depth direction from said original view-point.