Three-dimensional solid model retrieval method based on face topological interconnection constraint

A technology of association constraints and three-dimensional entities, applied in special data processing applications, instruments, electrical digital data processing, etc., to improve the level of reuse, accelerate product innovation and development capabilities, and promote the effect of deepening applications

Inactive Publication Date: 2009-07-22
NANJING UNIV
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Problems solved by technology

Generally speaking, designers spend an average of 60% of their working time on product information retrieval

Method used

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  • Three-dimensional solid model retrieval method based on face topological interconnection constraint
  • Three-dimensional solid model retrieval method based on face topological interconnection constraint
  • Three-dimensional solid model retrieval method based on face topological interconnection constraint

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Embodiment Construction

[0049] Such as figure 1 As shown, the present invention discloses a method for retrieving a three-dimensional solid model based on surface topology association constraints, and the method includes the following steps:

[0050] Step 1, given the product database of the 3D solid model, input the 3D solid model to be retrieved;

[0051] Step 2, judging whether the description file corresponding to the surface topology association constraint has been generated from the input entity model to be retrieved, if the judging result is yes, go to step 12;

[0052] Step 3, if the result of step 2 is no, then read geometric data such as vertices, edges, faces, rings of the solid model;

[0053] Step 4, generate the surface inclusion relationship graph R of the solid model IN , a node in the graph corresponds to a face of a solid model, and an edge indicates that the two connected model faces have an inclusion relationship;

[0054] Step 5, generate the coplanar relationship graph R of t...

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Abstract

The invention discloses a three-dimensional solid model retrieval method based on surface topology interconnection constraint. In the method, a model surface topology interconnection constraint set of the solid model comprising six kinds of surface relations of parallel, inclusion, coplanarity and L shape, T shape, X shape perpendicularity or intersection is firstly generated. Then, the commonest parallel surface pairs of the solid model are conflated to simplify the surface topology interconnection constraint set and generate a corresponding six conflated surface topology interconnection constraint set. When the three-dimensional solid model is retrieved, the approximation degree calculation of the surface topology interconnection constraint set is used for comparing the topology and geometric details. The three-dimensional solid model retrieval method based on the surface topology interconnection constraint has the beneficial effects that by rapid comparison of the surface topology interconnection constraints, similar three-dimensional solid models can be located rapidly in a large scale three-dimensional product database from two levels of overall topology relation and local topology/geometric details, thus multiplexing level of the three-dimensional product design is improved.

Description

technical field [0001] The present invention relates to a three-dimensional entity model retrieval method based on surface topology association constraints, and in particular to a three-dimensional entity that uses six types of surface topological relations and on this basis to compare the merged surface topology association constraint sets after parallel planes are merged Model Fast Retrieval Method. Background technique [0002] In the past ten years, with the reduction of the cost of 3D graphics hardware and the maturity of technology, 3D CAD design technology has been rapidly developed and applied in many fields such as machinery, manufacturing, construction, electronics, chemical industry, clothing and even advertising. According to statistics, in recent years, 3D CAD modeling has accounted for about 80% of the mold manufacturing industry. [0003] While the quantity and complexity of 3D CAD solid models are rapidly increasing, the problem of reuse of 3D product data i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30G06F17/50
Inventor 路通
Owner NANJING UNIV
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