VECTOR CUT PRINCIPLE AND METHOD FOR 3-D TECTONIC-STRATIGRAPHIC BASIN FRAMEWORK
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摘要: 三维矢量剪切功能的强弱, 是衡量所建立的盆地三维数字体质量的重要标志.在阐述了基于B-Rep模型的盆地三维数字体矢量剪切原理之后, 探讨了在计算机上实现矢量剪切的技术途径与方法.以线条、填充多边形、曲面和注释4种图元的剪切为基础, 建立了一个较为完善的盆地三维数字构造-地层体的矢量剪切模型, 并且编制了相应的软件.使用这一技术方法和软件系统, 对珠三凹陷进行了实际的矢量剪切分析, 取得了良好的效果.Abstract: The intensity of 3-D vector cut is an important indicator for the quality test of a 3-D digital basin model established. After the reiteration of vector cut principle of the B-Rep model-based 3-D digital basin, this paper deals with the technical approaches and methods for the actualization of the vector shearing function on a microcomputer. On the basis of vector shearing of four graphical primitives: line, polygon, surface and text, the author established a relatively perfect vector cut model for 3-D digital tectonic-stratigraphic basin, and, furthermore, wrote the corresponding software. The vector cut analysis of the Zhusan depression by means of this technical approach and software system has brought about an expected result.
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Key words:
- 3-D basin modeling /
- tectonic-stratigraphic framework /
- 3-D digital basin /
- vector cut /
- B-Rep model
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图 1 三维盆地构造-地层体的空间拓扑关系
Fig. 1. Spatial topological relationship of 3-D basin tectonic-stratigraphic entity
图 3 直线段与无界平面的求交问题举例
Fig. 3. Illustration of calculating intersection point between line segment and unbounded plane
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