Allowable delay time of images with motion parallax and high-speed image generation

Images with motion parallax generated by CG should be displayed, based on the user's viewpoint, without delay. In this paper we examine the influence of delay time on images with motion parallax, both subjectively and via the task, by means of a device for 3-D manipulation in virtual space, and we measure the delay time in which the user can easily perceive an image with motion parallax. We also present a method to generate CG image at high speed in the allowable time by selecting from a database of different detailed models one model based on the distance between the viewpoint and object.