| 摘要 |
PROBLEM TO BE SOLVED: To make an image expression unlike before and the real expression of an object such as the wave of a moving object moved on a water surface or the like. SOLUTION: The texture coordinate of the first vertex group of the object is not changed accompanying time lapse, the texture coordinate of a second vertex group is changed accompanying the time lapse and the texture coordinate is locally changed. The local change of the texture coordinate is realized by changing the texture coordinate in real time and replacing the object. The waveform, phase and period of a periodic function for obtaining the texture coordinate of lines 40 and 42 are made different. A control point is moved by higher initial acceleration as the speed of a boat is higher or as sinking depth is deeper and decelerated by gravity acceleration and the shape of a wave object accompanying the boat is controlled based on the control point. The control point is successively moved at the initial speed accompanying the time lapse, and based on the Y coordinate of the control point of the largest Y coordinate in the plural successively moved control points, the wave object is scaled in a Y axis direction.
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