Method for manufacturing three-dimensional grid model by draft input

Abstract

The invention provides a method for manufacturing a three-dimensional grid model by draft input. The method comprises the following steps: firstly, drawing a closed two-dimensional draft contour line on a computer screen by a mouse or a drawing pen; secondly, transforming the two-dimensional draft contour line into a cubic spline curve; thirdly, changing the shape of the cubic spline curve to obtain an expected contour shape of a three-dimensional model; fourthly, scattering the cubic spline curve into a polygon; fifthly, triangulating the polygon to generate a two-dimensional grid with uniform grids; sixthly, adjusting the position of the vertex of the two-dimensional grid to ensure that grids close to the contour line are dense; seventhly, transforming the two-dimensional grid into a three-dimensional grid, duplicating a symmetric three-dimensional grid; eighthly combining the two three-dimensional grids to form a three-dimensional grid; and finally, performing smooth treatment on the grid of the three-dimensional model to obtain a final three-dimensional model. The method can be used for manufacturing the three-dimensional grid model at high manufacture speed; and the three-dimensional model has good moulding quality and precision.

Description

technical field [0001] The invention relates to a three-dimensional modeling method, in particular to a sketch-type input three-dimensional grid model manufacturing method. Background technique [0002] 3D modeling is widely used in animation games, industrial design and education. The current 3D modeling process generally starts from a simple basic geometry (such as a cube or a sphere), and obtains a complex shape through a series of deformations and combinations. Various deformation techniques, such as free deformation and line deformation, are A 3D model with accurate shape and smooth surface can be obtained by manipulating and controlling the point, edge and surface of the 3D model. The disadvantage of directly controlling the point, edge and surface of the 3D model is that the operation is more complicated and the requirement for spatial imagination is relatively high. [0003] In recent years, the sketch-based modeling method is becoming a research hotspot. Zeleznik ...

AI Technical Summary

Problems solved by technology

As a pioneering method, its disadvantages are: the outline of the sketch cannot be edited, making it impossible to accurately control the shape of the 3D model, and the lack of sketch operations makes it impossible to design complex models

Although these methods have improved the sketch-based modeling method in different aspects, further improvement is needed in controlling the accuracy of the shape of the 3D model and the uniformity and smoothness of the mesh of the generated model.

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