| 摘要 |
<p>It is an obtain a subpolygon having a smooth three-dimensional shape from a polygon A Bezier curve, as interpolated line B12 which interpolates between vertices P1 and P2 of quadrilateral polygon P1P2P4P3 is determined using normal vectors n1 and n2, and an interpolated line B34 interpolating between vertices P3 and P4 is determined using normal vectors n3 and n4. Then, interpolated points P12 and P34 are determined on interpolated lines B12 and B34. Similarly, an interpolated line B13 interpolating between the vertices P1 and P3 and an interpolated line B24 interpolating between the vertices P2 and P4 are determined. Then interpolated points P13 and P24 are determined on interpolated lines B13 and B24. In the same way, an interpolated line B1234 interpolating between interpolated points P12 and P34 is determined and an interpolated point P1234 is determined on interpolated line B1234. Likewise, quadrilateral polygon P1P2P4P3 is split into 4 subpolygons, the quadrilateral polygons P1P12P1234P13, P12P2P24P1234, P1234P24P4P34 and P13P1234P34P3. <IMAGE></p> |
