intersectant
1.Clean-up technology is a sufficient method for intersectant profile of surface and its concave region as well as shallow surface.
2.Considering of the above algorithm is not appropriate to be realized in DSP (Digital Signal Processor), three additional location algorithms are presented: the improved Gauss-Newton iterative algorithm, the intersectant circle chord, the least square estimation.
3.This article proposes in order to quickly hidden processing is carried on to multi concavo-convex polyhedron, the hierarchical structure is applied to carried on description on TOPO relations of three dimensional physique; the bidirectional link table is applied to carried on the dynamic node assignment, for enhancing the efficiency of the algorithm; when multi three-dimensional body is being hidden processing, the screen projection polygon should be carried on the overlaped eliminating confirmation and the polygon edges be carried on the computation of the intersectant points, the depth inspection, the comprehensive test and so on.
4.It is consistent with Zircon U-Pb ages(141-143 Ma) by Davis at 1996. The found of the age of 2440Ma remain Zircon which is also consistent with the Zircon U-Pb age(the age of up intersectant point) by Davis(1996), suggests that the magma of Yunmeng Shan granites comes from the part melt of late-Archaean gneiss.
5.Aiming at the simplest equation ax2+by2+cz2=0,some properties of the section curves for a cone of the second order were discussed,giving the method to calculate the intersectant angle and the perpendicular condition for two straight lines on the cone of the second order. And examples were used to explain their application of the conclusion.
