计算机上的橡皮膜技术

由于构制和修改任意形三维物体在技术上有一定的难度，三维物探人机联作反演长期未能得到实际应用。本文提出一种技术，称之为橡皮膜技术，可以灵活地构制任意形三维物体。其特点是：用鼠标器交替地移动设置在一个闭合曲面周围的若干控制点，控制点带动其附近的曲面变形，形成所期望的复杂形态的物体模型；还可按需要多次增加控制点的数目，对模型做更为精细地调节。文章详细介绍了该技术的核心－磨光算法。通过多次磨光，将一个由为

RUBBER MEMBRANCE TECHNIQUE ON COMPUTER

Due to the technical difficulty in generating and updating 3D bodies of arbitrary shape, 3D geophysical interactive modelling has not been used practically. The rubber membrance technique is presented in this article, by which 3D bodies of arbitrary shape can be generated conveniently. Its main feature is: some controlling points around a closed surface are displaced alternately by the mouse; dragged by these points, the surface deforms gradually and its shape becomes complicated to approximate an arbitrary expected shape; the number of controlling points can be increased repeately several times, in order to adjust the model more elaborately, if necessary. The key of this technique-grinding algorithm is described in detail. By grinding many times, a polyhedron with a few triangles becomes that with much more number of smaller triangles to approximate a smooth surface. The methods for catching and moving controlling points are introduced also. The possible applications of this technique in geosciences are discussed.