| 摘要 |
A covering object (42) that covers a three-dimensional object (40) is provided within an object space. Every time a game-clear condition is satisfied, the display/non-display state of a polygon forming the covering object (42) is sequentially switched. If a moving body (44) moves to specify a region (36), the polygons of that region (36) are set to non-display. Alternatively, polygons that form the covering object (42) are sequentially set to non-display, on the basis of a criterion such as the ratio of correct answers in a quiz game, whether or not a mini-game has been cleared, or whether or not the player has won in Mah-Jongg. The transparent/nontransparent state of the covering object could equally well be switched sequentially, or the translucency thereof could be sequentially changed, or a texture mapped onto the three-dimensional object could be sequentially changed. If the region (36) is specified by the movement track of the moving body (44) intersecting itself, the image information of that region (36) is changed. A field-of-view image is synthesized from a viewpoint and a line-of-sight direction that follow the movement of the moving body (44).
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