JPS6488692A - Three-dimensional display device - Google Patents

Abstract

PURPOSE:To attain the high speed of paint out processing by obtaining a color intensity when a horizontal coordinate value is increased by one picture element and the change rate of a coordinate value in the direction of a depth on the scan line of a maximum length in an object triangle and using as the change rate on the respective scan lines. CONSTITUTION:The scan line L of the maximum length is detected in the triangle ABC to be painted out and the change rate of the coordinate value in the direction of the depth and the color intensity at the time of changing the horizontal coordinate value by one picture element on the scan line L of the maximum length are obtained. At the time of changing the horizontal coordinate value by one picture element in order to paint out for every scan line in the triangle ABC to be painted out, values obtained by adding the previously obtained change rate to the coordinate value in the direction of the depth and the color intensity of a preceding picture element on the respective scan lines are generated as the coordinate value in the direction of the depth and the color intensity of a succeeding picture element. Thereby, the paint out processing for a three dimensional display can be executed at high speed.