Image generating method and apparatus, recording medium and random number generator

An image generating apparatus for generating drawing data on the basis of a polygon drawing command and outputting the drawing data as image data, comprising:

• means for receiving the polygon drawing command, the polygon drawing command including polygon information for drawing a reference object representing a rough shape of an object to be drawn, and an initial value given to generate quasi minute drawing information of the object;
• quasi random number generating means for generating a reproducible sequence of random number values On the basis of the initial value, wherein said quasi random number generating means is initialized upon input of the initial value thereof, and uses a random number value thus generated as a random number seed to generate a next random number, thereby successively generating random number values;
• a counter which sets a preset counter set value, said quasi random number generating means generating a first sequence of random numbers equal in number to the preset counter set value;
• means for suppressing output of said random numbers until said preset counter set value is reached, and outputting a continuing sequence of random numbers only after said first sequence of random numbers has been generated;
• quasi minute drawing information generating means for dividing into plural fundamental polygons an object area or a partial area of an object which is represented by the polygon information for drawing the reference object and for calculating coordinates of each apex of said plural fundamental polygons on the basis of said continuing sequence of random number values, in order to generate the quasi minute drawing information;
• and
• drawing means for generating drawing data to draw the object on the basis of the plural fundamental polygons.