CN106156407A - Three-dimensional Multi-resolution cad model generates method - Google Patents
Three-dimensional Multi-resolution cad model generates method Download PDFInfo
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- CN106156407A CN106156407A CN201610475236.XA CN201610475236A CN106156407A CN 106156407 A CN106156407 A CN 106156407A CN 201610475236 A CN201610475236 A CN 201610475236A CN 106156407 A CN106156407 A CN 106156407A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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Abstract
The present invention relates to a kind of Three-dimensional Multi-resolution cad model and generate method, comprise the following steps: S1, by the volume size of feature, whether be Assembly interface and whether on model boundary, the priority of each feature in three-dimensional CAD model be ranked up；The volume of feature is the biggest, and priority is the highest；Feature is closer to Assembly interface, and priority is the highest；The priority of the feature being positioned on model boundary is higher than the priority of the not feature on model boundary；S2, remove feature the most one by one according to priority, generate multi-resolution models.The present invention considers geometrical factor and non-geometric factor when carrying out multi-resolution modeling simultaneously, by adding the non-geometric factor such as Assembly interface and external boundary, ensure that the multi-resolution models generated still effectively can assemble with other parts, change the model after resolution owing to remaining in that initial external dimensions simultaneously, the concordance of moulded dimension, it is to avoid produce mistake when assembling scheme and technology establishment.
Description
Technical field
The present invention relates to a kind of Three-dimensional Multi-resolution cad model and generate method.
Background technology
Owing to disintegration formula extra-high voltage transformer volume is big, structure is complicated, in order to support that disintegration formula extra-high voltage transformer decomposes
With packaging technology and solution formulation, need to carry out disintegration formula extra-high voltage transformer assembling process and carry out three-dimensional artificial.And in emulation
During improve efficiency to reduce complexity, need to reduce model data amount and complexity, need to become different step for disintegrating
And technique provides the threedimensional model of different resolution (Level of Detail, LOD).Existing Three-dimensional Multi-resolution cad model
Generation method mainly considers bulk factor, removes the most one by one according to the volume of geometric element and change model from model
Resolution, although this method can generate multi-resolution models, but is likely to remove while changing model resolution
Falling the Assembly interface of model, change the apparent size of model, this is the most disadvantageous for the decomposition become of disintegrating with assembling emulation.
Summary of the invention
The technical problem to be solved in the present invention is, the invention discloses a kind of Three-dimensional Multi-resolution cad model generation side
Method, by considering that geometrical factor and non-geometric are because usually keeping the Assembly interface in multi-resolution models and external dimensions simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: a kind of Three-dimensional Multi-resolution cad model of structure is raw
One-tenth method, comprises the following steps:
S1, by the volume size of feature, whether be Assembly interface and whether on model boundary to three-dimensional CAD mould
In type, the priority of each feature is ranked up；The volume of feature is the biggest, and priority is the highest；Feature is closer to Assembly interface, excellent
First level is the highest；The priority of the feature being positioned on model boundary is higher than the priority of the not feature on model boundary；
S2, remove feature the most one by one according to priority, generate multi-resolution models.
Ith feature F in such scheme, in three-dimensional CAD modeliPriority computing formula as follows:
Fi=αi·wα+βi·wβ+γi·wγ
Wherein αiIt is bulk factor, βiIt is Assembly interface factor, γiIt it is external boundary factor；wα、wβAnd wγIt is weights coefficients；
riIt is the sequence number that by volume sorts of ith feature, FtotalIt it is the total number of the feature in model.
In such scheme, wα、wβAnd wγSpan be [0,1].
The Three-dimensional Multi-resolution cad model implementing the present invention generates method, has the advantages that
The present invention considers geometrical factor and non-geometric factor when carrying out multi-resolution modeling simultaneously, is filled by addition
Connect the non-geometric factor such as mouth and external boundary, it is ensured that the multi-resolution models of generation still can be carried out effectively with other parts
Assembling, the model after change resolution is owing to remaining in that initial external dimensions simultaneously, the concordance of moulded dimension, it is to avoid
Mistake is produced when assembling scheme and technology establishment.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schematic diagram of butterfly valve Three-dimensional Multi-resolution cad model；
Fig. 2 is that model external dimensions and volume size are with change resolution schematic diagram.
Detailed description of the invention
In order to be more clearly understood from the technical characteristic of the present invention, purpose and effect, now comparison accompanying drawing describes in detail
The detailed description of the invention of the present invention.
Three-dimensional Multi-resolution cad model of the present invention generates method, it is characterised in that comprise the following steps:
S1, by the volume size of feature, whether be Assembly interface and whether on model boundary to three-dimensional CAD mould
In type, the priority of each feature is ranked up；The volume of feature is the biggest, and priority is the highest；Feature is closer to Assembly interface, excellent
First level is the highest；The priority of the feature being positioned on model boundary is higher than the priority of the not feature on model boundary.Concrete
Ith feature F in three-dimensional CAD modeliPriority computing formula as follows:
Fi=αi·wα+βi·wβ+γi·wγ
Wherein αiIt is bulk factor, βiIt is Assembly interface factor, γiIt it is external boundary factor.wα、wβAnd wγIt is that span is
[0,1] weights coefficient, this coefficient value is determined by user, and its default value is 1.riIt is that ith feature by volume sorts
Sequence number, FtotalIt it is the total number of the feature in model.
S2, remove feature the most one by one according to priority, generate multi-resolution models.
Generate butterfly valve Three-dimensional Multi-resolution cad model according to the method described above as it is shown in figure 1, w in this embodimentα: wβ: wγ
=1:1:2.As in figure 2 it is shown, when model resolution (LOD) drops to 27% from 90%, solid line represents the external dimensions of model
Situation of change, dotted line represents its change in volume situation, from figure 2 it can be seen that along with resolution is gradually lowered, three-dimensional CAD mould
The volume of type is gradually reduced, and its external dimensions remains constant.
Above in conjunction with accompanying drawing, embodiments of the invention are described, but the invention is not limited in above-mentioned concrete
Embodiment, above-mentioned detailed description of the invention is only schematic rather than restrictive, those of ordinary skill in the art
Under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, it may also be made that a lot
Form, within these belong to the protection of the present invention.
Claims (3)
1. a Three-dimensional Multi-resolution cad model generates method, it is characterised in that comprise the following steps:
S1, by the volume size of feature, whether be Assembly interface and whether on model boundary in three-dimensional CAD model
The priority of each feature is ranked up；The volume of feature is the biggest, and priority is the highest；Feature is closer to Assembly interface, priority
The highest；The priority of the feature being positioned on model boundary is higher than the priority of the not feature on model boundary；
S2, remove feature the most one by one according to priority, generate multi-resolution models.
Three-dimensional Multi-resolution cad model the most according to claim 1 generates method, it is characterised in that in three-dimensional CAD model
Ith feature FiPriority computing formula as follows:
Fi=αi·wα+βi·wβ+γi·wγ
Wherein αiIt is bulk factor, βiIt is Assembly interface factor, γiIt it is external boundary factor；wα、wβAnd wγIt is weights coefficients；riIt is
The sequence number that ith feature by volume sorts, FtotalIt it is the total number of the feature in model.
Three-dimensional Multi-resolution cad model the most according to claim 2 generates method, it is characterised in that wα、wβAnd wγTake
Value scope is [0,1].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610475236.XA CN106156407A (en) | 2016-06-24 | 2016-06-24 | Three-dimensional Multi-resolution cad model generates method |
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| CN201610475236.XA CN106156407A (en) | 2016-06-24 | 2016-06-24 | Three-dimensional Multi-resolution cad model generates method |
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| CN106156407A true CN106156407A (en) | 2016-11-23 |
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| CN201610475236.XA Pending CN106156407A (en) | 2016-06-24 | 2016-06-24 | Three-dimensional Multi-resolution cad model generates method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751309A (en) * | 2002-12-18 | 2006-03-22 | Ge医疗系统环球技术有限公司 | Medical data analysis method and apparatus incorporating in vitro test data |
| WO2006105158A2 (en) * | 2005-03-29 | 2006-10-05 | Microsoft Corp. | System and method for transferring web page data |
| CN101501664A (en) * | 2005-03-29 | 2009-08-05 | 微软公司 | System and method for transferring web page data |
-
2016
- 2016-06-24 CN CN201610475236.XA patent/CN106156407A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751309A (en) * | 2002-12-18 | 2006-03-22 | Ge医疗系统环球技术有限公司 | Medical data analysis method and apparatus incorporating in vitro test data |
| WO2006105158A2 (en) * | 2005-03-29 | 2006-10-05 | Microsoft Corp. | System and method for transferring web page data |
| CN101501664A (en) * | 2005-03-29 | 2009-08-05 | 微软公司 | System and method for transferring web page data |
Non-Patent Citations (1)
| Title |
|---|
| 方萃浩 等: "三维CAD特征模型的多分辨率造型", 《浙江大学学报(工学版)》 * |
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Application publication date: 20161123 |
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