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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.

Inactive Publication Date: 2011-01-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited research in this area, and there is no mature and ideal method for creating 3D surface models based on perspective sketches

Method used

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

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Experimental program
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Embodiment Construction

[0048] The method for creating a three-dimensional curved surface model using a perspective sketch disclosed by the present invention specifically includes the following steps ( figure 1 is the flowchart of the whole method):

[0049] Step 1, shape clue discovery: process the sketch strokes input by the user into a point-edge graph consisting of silhouette edges and joint points connecting the silhouette edges, and identify closed areas.

[0050] Step 2, 3D viewing angle recovery: including three parts: symmetric relationship identification, observation coordinate system recovery and coordinate calculation. The symmetric relationship identification part identifies the symmetric relationship between the elements of the model and infers the hidden contour line. The observation coordinate system recovery part is based on The symmetry axis restores the observation coordinate system of the model, and the coordinate calculation part calculates the spatial three-dimensional coordinat...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20
Inventor 孙正兴章菲倩张尧烨刘凯
Owner NANJING UNIV
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