| 摘要 |
Between two apexes associated with each other, a first virtual spring for applying, to the two apexes, a virtual force which is changed in magnitude in accordance with a distance between the two apexes is set. At least one apex of the shape model displayed on a screen is designated as a control point, and a second virtual spring is set between the control point and each apex other than the control point. When positional relationship between the apexes of the shape model is changed from that of a reference state by the movement of the control point, a magnitude of a virtual force received by each apex of the post-change shape model from the first and second virtual springs is calculated. A position to which each apex is to be moved is determined based on the calculated virtual force, and the resultant shape model is displayed on the screen.
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