Method and computer-readable medium for generating image of three-dimensional object

A method causing a computer to generate an image of a three-dimensional object existing in a virtual three-dimensional space by projecting the three-dimensional object onto a picture plane by perspective projection using a virtual camera arranged in the three-dimensional space, the method comprising:

• updating a position and/or orientation of the virtual camera in response to a change in a position of at least one of a plurality of vanishing points existing on the picture plane and corresponding to infinity of coordinate axes in a known Cartesian coordinate system existing in the three-dimensional space;
• and
• generating the image of the three-dimensional object based on the virtual camera, the position and/or orientation of which is updated, wherein
• the updating includes changing the position and/or orientation of the virtual camera by applying a process having a characteristic in which, in a case where the changed position of the vanishing point is returned to the position of the vanishing point before the change in the position of the at least one of the plurality of vanishing points, the updated position and/or orientation of the virtual camera is returned to the position and/or orientation of the virtual camera before the change in the position of the at least one of the plurality of vanishing points.