| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently generate an image on the environment in the game image such as rain, snow, a grassy plain, and a forest at a high speed. SOLUTION: A snow arithmetic part 220 generates a snow model formed with a plurality of snow based on initial positions and initial speeds and calculates the shift quantities of individual snow with the elapse of the game time. A region determination part 222 sets an expression region expressing snow on the world coordinate system after receiving the data such as the prescribed view point position and line of sight direction from the game arithmetic part 22 and calculates representative points representing the expression region. A snow position determination part 224 determines the initial positions of individual snow in the expression region basest on the representative points calculated by the region determination part 222 and adds the shift quantities of individual snow calculated by the snow arithmetic part 220 to the initial positions.</p> |
