Image processing apparatus, control method and program of the image processing apparatus

A it is possible to realize while achieving a reduction in load of the image processing shading representation of the object surface, and to provide an image processing apparatus also becomes possible to achieve reduction of discomfort felt by the user. A shading process execution unit 62, based on the pseudo-normal vector for each pixel of a texture image to be mapped onto the object surface, executes the shading process for the object surface. Shading process execution restricting unit 66, based on the distance from the viewpoint to the object, to restrict the execution of the shading process by the shading process execution unit 62. Pseudo-normal vector obtaining unit 60 stores the distance from the viewpoint, the pseudo-normal vector information for obtaining a pseudo-normal vector for each pixel, the a becomes correspondence information. Then, the pseudo-normal vector obtaining unit 60, a pseudo-normal vector for each pixel is obtained based on the pseudo-normal vector information corresponding to the distance from the viewpoint to the object. .The 10