Slicing direction self-adaptive rapid selection method

Abstract

The invention discloses a slicing direction self-adaptive rapid selection method which is characterized by carrying out triangular meshing on a three-dimensional model to obtain a triangle patch and then, calculating area weighted normal vector; then, carrying out principal component analysis on the area weighted normal vector, establishing a covariance matrix and carrying out singular value decomposition, and obtaining three feature vectors serving as candidate slicing directions; and then, carrying out slicing on the model in the candidate slicing directions and calculating total volume errors of established models obtained after splicing and an original model, and the candidate slicing direction corresponding to the minimum total volume error being the optimal slicing direction. According to the method, three perpendicular orthogonal candidate slicing directions are obtained through extracting feature vectors, and the optimal slicing direction is selected based on the minimum volume error without taking samples of all normal vectors of the surface of the model or space normal vectors as the candidate slicing directions, thereby improving model precision and meanwhile, reducing algorithm complexity, and reducing time in obtaining the optimal slicing direction greatly; and the method is suitable for models with complex geometrical characteristics or topological structure.

Description

technical field [0001] The invention relates to a data processing method, in particular to a layering direction selection method in rapid prototyping. Background technique [0002] 3D printing is a kind of rapid prototyping technology (Rapid prototyping), which was first proposed by the Massachusetts Institute of Technology (MIT), using the idea of ​​layered manufacturing (additional manufacturing). Rapid prototyping is a general term for technologies such as reverse engineering, computer-aided design and manufacturing, material removal molding, material addition molding, and layered manufacturing. Now 3D printing is a general term for rapid prototyping technology. Layered manufacturing refers to discretizing a 3D model into a set of 2D graphics along the layering direction, that is, a set of thin layers (also called slices or layers), which are processed layer by layer and superimposed layer by layer to form a 3D model entity. This technology has the advantages of simple e...

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Problems solved by technology

With the popularity of 3D printing, the models that need to be printed are not limited to simple 3D models made by CAD, but more sophisticated and complex models in the real world, such as character models, artwork models, etc. The geometric characteristics of such models are complex, The number of triangles representing the model is huge, and the traditional layering direction selection method has been unable to meet the real-time requirements of layering direction selection

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