Planar and nonplanar slicing algorithms for fused deposition modeling technology: a critical review

The invention discloses a plane scatter data-oriented flow direction groove cascade automatic generation method, which comprises the following steps of: taking scatter data of two curves intercepted on a suction surface and a pressure surface as input data, and connecting scatter points according to an anticlockwise sequence to obtain a plane outline of a polygon for representing a cascade; calculating an outward normal vector of each edge of the polygon, taking normal vectors of two edges where each vertex is located, and calculating an outward normal vector of the vertex; setting a groove depth, translating each vertex of the polygon by the groove depth along a normal vector to obtain a plane projection polygon at the most convex part of the groove; calculating the three-dimensional coordinates of the points of each layer according to the shape and depth of the groove, and connecting the points of the adjacent layers into a triangular patch; and finally, triangulating the planar polygons of the two bottom surfaces to obtain a blade grid triangular mesh model provided with grooves along the flow direction. Experimental results show that the method provided by the invention can draw high-precision grooves on the cascade, and the calculation efficiency is high.

Plane scatter data-oriented flow direction groove cascade automatic generation method

Virtual edge method for point cloud slicing in 3D printing is a very common algorithm due to the advantage of low computational complexity. However, this approach is not robust to density variations. To overcome this shortcoming, in this paper, a concept of column neighborhood is introduced to estimate whether the virtual edge model should be used in certain situations. Concretely, based on the technic of generating a set of multiple contours, we present an improved algorithm for high resolution point cloud slicing. To deal with multiple contours, a classify method based on convex hull is proposed, which reduces considerable calculations and separates each module from the others. At the last step, a method based on minimum angle is proposed to generate a single contour for each class. This algorithm is verified to be efficient by testing on kinds of typical benchmarks. Keywords—virtual edge; convex hull; classify

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A Slicing Algorithm Based on Virtual Edge for 3D Printing

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A Slicing Algorithm Based on Virtual Edge for 3D Printing