Method for creating three-dimensional surface model by using perspective sketch

A 3D surface and sketch technology, applied in 3D modeling, image data processing, instruments, etc., can solve the problems of lack of mature 3D surface model method and limited research.
CN101937579AInactive Publication Date: 2011-01-05NANJING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING UNIV
Publication Date
2011-01-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for creating a three-dimensional surface model by using a perspective sketch. The method comprises the following steps of: identifying and processing a hand-drawn sketch into a vertex-edge graph consisting of contour sides and articulation points, and identifying closed areas; identifying the symmetric relation of the three-dimensional surface model, and completing hidden contours for the contours according to symmetry and visibility; establishing an object coordinate system of the surface model according to a symmetrical relation, calculating three-dimensional coordinates of the contour sides and the articulation points of the surface model, and recovering the coordinates of three-dimensional space curves among the articulation points according to curve projection between the three-dimensional coordinates of the articulation points and the articulation points; categorizing the three-dimensional closed areas of the model into different closed area pieces according to the characteristics of a level modeling method and a B-spline surface fitting method; and modeling the closed area pieces into sub-surfaces according to the characteristics of the closed area pieces by the level modeling method or the B-spline surface fitting method and jointing the sub-surfaces into a three-dimensional model through dispersing, blending and splicing.
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Description

technical field

[0001] The invention relates to a processing method for graphic analysis and interpretation, which belongs to the technical field of computer graphics, in particular to a method for creating a three-dimensional curved surface model by using a perspective sketch. Background technique

[0002] Surface models are complex and diverse, and are widely used in the field of design creation due to their various expressiveness, and are important components in the design of complex models. The surface model is also more complicated to create than the polyhedral model because of its complex features without fixed geometric rules. Most current 3D surface model creation technologies focus on detailed design such as surface parameters. The operation is complex and requires relevant mathematics and graphics expertise, and it is impossible to grasp the creation of 3D surface models from an overall perspective, which limits the creativity of most designers. Express. In fact,...

Claims

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