Rapid Prototyping And Manufacturing Based On Point Cloud Data

How to model the practicality rapidly,directly and accurately is a crucial problem in product creation design and rapid prototyping.This paper studies how to generate the slice data from point clouds. At present,there are two ways available.In the first path,a CAD model is created first from point clouds then converted to a STL file.The STL file is then sliced to generate a series of layers for RP fabrication.The second path is to create the STL file directly from point clouds .However,there are drawbacks in these methods,such as long time consumed,much manual interaction and so on.A new method is brought forward to solve this question.It goes directly from point clouds to a RP slice file.This paper first expatiates the preprocess of data,which include choosing the orientation to slice,topologizing the data.Secondly,it studies two ways of directly slicing,which is to generate the contour data on a series of parallel planes,or normal planes of a freeform curve.These two methods have the same principle,which gets the contour data by crossing the plane and the line between the two points of least distance.Finally,it addresses the process of contour data,such as extracting a cell-contour,sorting the points in one cell-contour to a contour line,and fitting the contour to a smooth one with biarc curves. Though RP has extensive prospect, corresponding hardware its facility price is very expensive. According with present users' demand, this text puts forward and carries on the method processed in NC from STL file directly.