Method for producing bump mapping effect for a three dimensional object of a computer graphic

Abstract

A method is for producing the bump mapping effect for a 3D object in a computer graphic. First, a shading vector is produced at one point of the surface of the 3D object. A shift coordinate with respect to this point is determined, according to the shading vector. According to the shift coordinate, a rotational calculation matrix is set up. Then, a diffuse color value with respect to this point is computed, which is equal to the difference between an adjacent rotation color value to this point and an averaged color value, wherein the averaged color value is defined as the sum and average of the color channels for R, G, and B with respect to this point, and the adjacent rotation color value is defined as a sum of the averaged color value with respect to a number of the adjacent points and the coefficient product with respect to the adjacent points in the rotational calculation matrix. Then, the emboss image value at this point is computed. The color channels of R, G, and B of the emboss image value are respectively equal to the product of the color channels of R, G, and B at this point being subtracted by the diffuse color value and the coefficient of the emboss effect. By repeating the foregoing steps, the emboss image value at each point of the surface of the 3D object is computed.