CN102117288A - Method and device used for searching modeling data in three-dimensional modeling - Google Patents
Method and device used for searching modeling data in three-dimensional modeling Download PDFInfo
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- CN102117288A CN102117288A CN2009102442655A CN200910244265A CN102117288A CN 102117288 A CN102117288 A CN 102117288A CN 2009102442655 A CN2009102442655 A CN 2009102442655A CN 200910244265 A CN200910244265 A CN 200910244265A CN 102117288 A CN102117288 A CN 102117288A
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Abstract
The invention provides a method and a device used for searching modeling data in three-dimensional modeling. The method comprises the steps: an original terrain data is subjected to level division according to the resolution ratio, each layer of data is subjected to data block division and a tree form storage structure is construed; searching is started from the layer with low resolution ratio, whether each data block at the current layer is positioned in the visible area is judged, if so, whether the visible area is overlapped with an object display area or not is judged; and if the visible area is overlapped with the object display area, whether the resolution ratio of the current data block meets the display resolution ratio requirements or not is judged, if so, the current data block is the modeling data, if not, searching is conducted on the layer with high resolution ratio. The method and device can reduce the data volume in the modeling process, reduce the arithmetic complexity and save the modeling time.
Description
Technical field
The present invention relates to the dimensional Modeling Technology field, particularly relate to the method and the device of search modeling data in a kind of three-dimensional modeling.
Background technology
Three-dimensional modeling is usually used in the processing of geographic information data, has using value in a plurality of fields such as oil-field development, geological research, mappings.Three-dimensional modeling is a kind of method of setting up stereoscopic model in the space on process; On the result, briefly the model of setting up exactly has spatial impression and can see up and down all around.
Utilizing three-dimensional model to carry out particularly in the process to global gound-mapping, often needing a large amount of terrain datas in the large-scale gound-mapping process.But because under the situation that the real earth shows, it is visible having only the subregion, some zone is outside display window, and some zone is the back side that is showing.Like this,, waste resource beyond doubt, consume the modeling time if still modeling is carried out in these invisible places.
Therefore, urgent problem is at present: how to filter out the data that meet modeling demand from a large amount of terrain datas.
Summary of the invention
Technical matters to be solved by this invention provides the method and the device of search modeling data in a kind of three-dimensional modeling, can reduce the data volume of modeling.
In order to address the above problem, the invention discloses the method for search modeling data in a kind of three-dimensional modeling, comprising:
Original terrain data is cut apart level according to resolution, and each layer data is carried out data block cut apart, set up tree-like storage organization;
Begin search from the low level of resolution, judge whether each data block when anterior layer is visibility region, if then judge whether to overlap with the target viewing area;
If overlap, then continue to judge whether the resolution of current data block meets the display resolution requirement, if meet, then current data block is a modeling data;
If do not meet, then continue the high level of next resolution is searched for.
Wherein, described continuation comprises the high level search of next resolution:
The data block that does not meet display resolution in the last layer is corresponded to down the branch data piece of one deck, judge whether to be visibility region, if then judge whether to overlap with the target viewing area;
If overlap, then continue to judge whether resolution meets the display resolution requirement, if meet, then be modeling data;
If do not meet, then continue the high level of next resolution to be searched for according to above-mentioned steps.
Wherein, judge whether to be visibility region in the following manner:
Judge that by the data block normal direction this data block belongs to the front or the reverse side of demonstration, if positive, then be visibility region.
Wherein, whether the judgment data piece overlaps with the target viewing area in the following manner:
The bounding box of this data block is carried out projection to display plane;
If the final projection polygon of forming has a summit in the target viewing area, then this data block and target viewing area overlap.
Wherein, judge whether to meet the display resolution requirement in the following manner:
Data block resolution and display resolution are compared,, be judged as and meet the display resolution requirement when data block resolution during more than or equal to display resolution.
The present invention also provides the device of search modeling data in a kind of three-dimensional modeling, comprising:
Data model is set up module, is used for original terrain data is cut apart level according to resolution, and each layer data is carried out data block cuts apart, and sets up tree-like storage organization;
The visibility region judge module is used for beginning search from the low level of resolution, judges whether each data block when anterior layer is visibility region;
The overlapping judge module is used for when data block is visibility region, judges whether to overlap with the target viewing area;
The resolution judge module is used for continuing to judge whether the resolution of current data block meets the display resolution requirement when overlapping, if meet, then current data block is a modeling data; If do not meet, then trigger the visibility region judge module and continue the high level of next resolution is searched for.
Wherein, described visibility region judge module is searched for the high level of next resolution in the following manner:
Described visibility region judge module corresponds to down the branch data piece of one deck to the data block that does not meet display resolution in the last layer, judges whether to be visibility region, if then trigger the overlapping module and judge whether to overlap with the target viewing area;
If overlap, then trigger the resolution judge module and continue to judge whether resolution meets the display resolution requirement, if meet, then be modeling data;
If do not meet, then continue the high level of next resolution to be searched for according to above-mentioned steps.
Wherein, described visibility region judge module comprises:
The normal judging unit is used for judging that by the data block normal direction this data block belongs to the front or the reverse side of demonstration, if positive, then be visibility region.
Wherein, described overlapping judge module comprises:
Projecting cell is used for when data block is visibility region, and the bounding box of this data block is carried out projection to display plane;
The overlapping judging unit is used for when the final projection polygon of forming has a summit in the target viewing area, judges that this data block and target viewing area overlap, and then this data block is a visibility region.
Wherein, described resolution judge module comprises:
Comparing unit is used for data block resolution and display resolution are compared;
The interpretation of result unit is used for when data block resolution during more than or equal to display resolution, is judged as to meet the display resolution requirement.
Compared with prior art, the present invention has the following advantages:
The invention provides a kind of method of from a large amount of terrain datas, searching for modeling data, by terrain data to pyramid structure, according to the resolution judgement of carrying out visibility region and resolution requirement of block-by-block successively from low to high, the data that meet the visibility region of display resolution can be used for modeling.Like this, just significantly reduce the data volume of modeling process, reduced the complexity of algorithm, saved the modeling time.
Description of drawings
Fig. 1 is the method flow diagram of search modeling data in the embodiment of the invention one described a kind of three-dimensional modeling;
Fig. 2 is the pyramid structure synoptic diagram of hierarchical block in the embodiment of the invention;
Fig. 3 is the synoptic diagram of data directory in the embodiment of the invention;
Fig. 4 is the method flow diagram of search modeling data in the embodiment of the invention two described a kind of three-dimensional modelings;
Fig. 5 is the structure drawing of device of search modeling data in the embodiment of the invention three described a kind of three-dimensional modelings.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
In order to reduce modeling data, solution of the present invention is: the ground ball is divided into a plurality of region units according to the principle of longitude and latitude, the region unit (being visible region unit) that needs are shown carries out modeling, and to outside the display window and show that the region unit at the back side gives up.
Embodiment one:
With reference to Fig. 1, be the method flow diagram of search modeling data in the embodiment of the invention one described a kind of three-dimensional modeling.
Present embodiment has used the mode of hierarchical pyramid, and the initial landform data are divided into many levels, and each level is represented the data model of different fine degree (being different resolution).For every layer data, be divided into data block again, so only need set up the model of visible part, then do not carry out modeling for sightless zone, thereby rationally reduce the data volume that participates in terrain rendering, the time complexity of reduction and shortcut calculation.
With reference to Fig. 2, be the pyramid structure synoptic diagram of hierarchical block in the embodiment of the invention.
What present embodiment adopted is 2 multiplying power pyramid hierarchies, more and more higher to high-rise (i.e. the 2nd layer among the figure) its resolution from pyramidal bottom (i.e. the 0th layer the figure), and the piece number that divides is also more and more.Suppose that bottom resolution is r
0, then the resolution of i layer is r arbitrarily
i=r
0* 2
-iLike this, for the requirement that TV is particularly exported this constant display precision, use pyramid model can make the visit capacity of data remain on a smaller and constant scope.
Preferably, data reads for convenience, file for the storage data block information, the same mode of piecemeal of using is handled earlier, can disposable needed data be read in fully when obtaining data like this, work such as do not obtain and do not need that again data are carried out range arithmetic, interpolation, thereby made things convenient for data read, quickened modeling process.
With reference to shown in Figure 3, present embodiment has been taked the method for quaternary tree tile index to the data file.Be the corresponding hierarchical block structure of storage of file, write down its level and ranks number in storage, each data block is just by unique record.Like this, can calculate the longitude and latitude scope that this piece is represented fast, also can find needed data block fast by the longitude and latitude scope by filename.
If then continue step 103; If not, then give up, be not used in modeling.
Concrete determination methods is: judge that by the data block normal direction it belongs to the front or the reverse side of demonstration, be blocked if reverse side then illustrates, can not show; May show if the front then illustrates, be visibility region.
If overlap, then continue step 104; Otherwise, give up, be not used in modeling.
The determination methods that overlaps is: the bounding box of visibility region data block is carried out projection to display plane, finally form the projection polygon, if the projection polygon has a summit in indication range, just illustrate that itself and target viewing area overlap.
Data block resolution and display resolution are compared,, be judged as and meet the display resolution requirement when data block resolution during more than or equal to display resolution.
Through above-mentioned flow processing, just can from a large amount of initial landform data, filter out the data that can be used for modeling, i.e. visible partial data has reduced the data volume of modeling process, has reduced the complexity of algorithm, has saved the modeling time.
Embodiment two:
Present embodiment will describe by detailed realization flow.
With reference to Fig. 4, be the method flow diagram of search modeling data in the embodiment of the invention two described a kind of three-dimensional modelings.
The method for fast searching of the modeling data that present embodiment provides, what adopt is the method for searching for layer by layer, adopt resolution strategy from coarse to fine, that advance layer by layer: judge at first whether terrain data is visibility region, if, then whether test satisfies resolution requirement with the top layer data block that the target viewing area overlaps, if do not satisfy, the branch that then continues the test data piece is up to searching out the data that all satisfy resolution requirement.Complete process prescription is as follows:
Step 401 judges whether the top layer data block is visibility region;
If then continue step 402; Otherwise, finish search.
At first begin to judge that from the low level of resolution (being pyramidal top layer) determination methods is:
Judge that by the data block normal direction it belongs to the front or the reverse side of demonstration, be blocked, can not show if reverse side then illustrates; May show if the front then illustrates, be visibility region.
Step 402 judges whether the top layer data block overlaps with the target viewing area;
If overlap execution in step 403; If from, finish search.
The determination methods that overlaps is:
The bounding box of data block is carried out projection to display plane, finally form the projection polygon,, just illustrate that itself and target viewing area overlap if the projection polygon has a summit in indication range.
Step 403 judges whether the top layer data block satisfies resolution requirement;
If satisfy resolution requirement, be inserted into the drafting chained list, finish search, represent that this data block is used for modeling and uses;
If do not satisfy resolution requirement, be inserted into test chained list 1, execution in step 404.
The method of resolution test is: display resolution is compared with data block resolution, if data block resolution, represents then that this data block meets the demands more than or equal to display resolution.Owing to adopt the method for quaternary tree index, so the resolution differences of adjacent layer is 2, is easy to calculate correct data block resolution level like this.
Step 404 is extracted four branch data pieces testing all data blocks in the chained list 1, judges whether to overlap with the target viewing area;
If overlap, be inserted into test chained list 2, and empty test chained list 1, execution in step 405;
If do not overlap, finish search.
In pyramid structure, the data block between layer and the layer constitutes branched structure, and the data block of promptly descending one deck is the branch of last layer, can be with reference to shown in Figure 3.
Step 405 judges whether the data block in the test chained list 2 satisfies resolution requirement;
If satisfy resolution requirement, be inserted into the drafting chained list, finish;
If do not satisfy resolution requirement, be inserted into test chained list 1, and empty test chained list 2, execution in step 404.
The flow process end condition is: test chained list 1 is for empty.
Embodiment three:
With reference to Fig. 5, be the structure drawing of device of search modeling data in the embodiment of the invention three described a kind of three-dimensional modelings.
Described device mainly comprises:
Data model is set up module 51, is used for all terrain datas are cut apart level according to resolution, and each layer data is carried out data block cuts apart, and sets up tree structure;
Visibility region judge module 52 is used for beginning search from the low level of resolution, judges whether each data block when anterior layer is visibility region;
Overlapping judge module 53 is used for when data block is visibility region, judges whether to overlap with the target viewing area;
Resolution judge module 54 is used for continuing to judge whether the resolution of current data block meets the display resolution requirement when overlapping, if meet, then current data block is a modeling data; If do not meet, then trigger the visibility region judge module and continue the high level of next resolution is searched for.
Wherein, described visibility region judge module 52 is searched for the high level of next resolution in the following manner:
Described visibility region judge module corresponds to down the branch data piece of one deck to the data block that does not meet display resolution in the last layer, judges whether to be visibility region, if then trigger the overlapping module and judge whether to overlap with the target viewing area;
If overlap, then trigger the resolution judge module and continue to judge whether resolution meets the display resolution requirement, if meet, then be modeling data;
If do not meet, then continue the high level of next resolution to be searched for according to above-mentioned steps.
Further, described visibility region judge module 52 can comprise:
The normal judging unit is used for judging that by the data block normal direction this data block belongs to the front or the reverse side of demonstration, if positive, then be visibility region.
Described overlapping judge module 53 can comprise:
Projecting cell is used for when data block is visibility region, and the bounding box of this data block is carried out projection to display plane;
The overlapping judging unit is used for when the final projection polygon of forming has a summit in the target viewing area, judges that this data block and target viewing area overlap, and then this data block is a visibility region.
Described resolution judge module 54 can comprise:
Comparing unit is used for data block resolution and display resolution are compared;
The interpretation of result unit is used for when data block resolution during more than or equal to display resolution, is judged as to meet the display resolution requirement.
In sum, described device according to the resolution judgement of carrying out visibility region and resolution requirement of block-by-block successively from low to high, can be used for modeling by the terrain data to pyramid structure with the data that meet the visibility region of display resolution.Like this, just significantly reduce the data volume of modeling process, reduced the complexity of algorithm, saved the modeling time.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For device embodiment, because it is similar substantially to method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
More than in a kind of three-dimensional modeling provided by the present invention the search modeling data method and device, be described in detail, used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the method for search modeling data in the three-dimensional modeling is characterized in that, comprising:
Original terrain data is cut apart level according to resolution, and each layer data is carried out data block cut apart, set up tree-like storage organization;
Begin search from the low level of resolution, judge whether each data block when anterior layer is visibility region, if then judge whether to overlap with the target viewing area;
If overlap, then continue to judge whether the resolution of current data block meets the display resolution requirement, if meet, then current data block is a modeling data;
If do not meet, then continue the high level of next resolution is searched for.
2. method according to claim 1 is characterized in that, described continuation comprises the high level search of next resolution:
The data block that does not meet display resolution in the last layer is corresponded to down the branch data piece of one deck, judge whether to be visibility region, if then judge whether to overlap with the target viewing area;
If overlap, then continue to judge whether resolution meets the display resolution requirement, if meet, then be modeling data;
If do not meet, then continue the high level of next resolution to be searched for according to above-mentioned steps.
3. method according to claim 1 and 2 is characterized in that, judges whether to be visibility region in the following manner:
Judge that by the data block normal direction this data block belongs to the front or the reverse side of demonstration, if positive, then be visibility region.
4. method according to claim 1 and 2 is characterized in that, whether the judgment data piece overlaps with the target viewing area in the following manner:
The bounding box of this data block is carried out projection to display plane;
If the final projection polygon of forming has a summit in the target viewing area, then this data block and target viewing area overlap.
5. method according to claim 1 and 2 is characterized in that, judges whether to meet the display resolution requirement in the following manner:
Data block resolution and display resolution are compared,, be judged as and meet the display resolution requirement when data block resolution during more than or equal to display resolution.
6. the device of search modeling data in the three-dimensional modeling is characterized in that, comprising:
Data model is set up module, is used for original terrain data is cut apart level according to resolution, and each layer data is carried out data block cuts apart, and sets up tree-like storage organization;
The visibility region judge module is used for beginning search from the low level of resolution, judges whether each data block when anterior layer is visibility region;
The overlapping judge module is used for when data block is visibility region, judges whether to overlap with the target viewing area;
The resolution judge module is used for continuing to judge whether the resolution of current data block meets the display resolution requirement when overlapping, if meet, then current data block is a modeling data; If do not meet, then trigger the visibility region judge module and continue the high level of next resolution is searched for.
7. device according to claim 6 is characterized in that, described visibility region judge module is searched for the high level of next resolution in the following manner:
Described visibility region judge module corresponds to down the branch data piece of one deck to the data block that does not meet display resolution in the last layer, judges whether to be visibility region, if then trigger the overlapping module and judge whether to overlap with the target viewing area;
If overlap, then trigger the resolution judge module and continue to judge whether resolution meets the display resolution requirement, if meet, then be modeling data;
If do not meet, then continue the high level of next resolution to be searched for according to above-mentioned steps.
8. according to claim 6 or 7 described devices, it is characterized in that described visibility region judge module comprises:
The normal judging unit is used for judging that by the data block normal direction this data block belongs to the front or the reverse side of demonstration, if positive, then be visibility region.
9. according to claim 6 or 7 described devices, it is characterized in that described overlapping judge module comprises:
Projecting cell is used for when data block is visibility region, and the bounding box of this data block is carried out projection to display plane;
The overlapping judging unit is used for when the final projection polygon of forming has a summit in the target viewing area, judges that this data block and target viewing area overlap, and then this data block is a visibility region.
10. according to claim 6 or 7 described devices, it is characterized in that described resolution judge module comprises:
Comparing unit is used for data block resolution and display resolution are compared;
The interpretation of result unit is used for when data block resolution during more than or equal to display resolution, is judged as to meet the display resolution requirement.
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Cited By (4)
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| CN102819568A (en) * | 2012-07-18 | 2012-12-12 | 哈尔滨工程大学 | Submarine topography data establishment method based on topographical sampling point positions |
| CN105912638A (en) * | 2016-04-08 | 2016-08-31 | 苏州中科图新网络科技有限公司 | Oblique photograph data storage and scheduling method and apparatus |
| CN107730583A (en) * | 2017-10-26 | 2018-02-23 | 浙江科澜信息技术有限公司 | A kind of terrain tile data dynamic dispatching method and device based on three-dimensional scenic |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819568A (en) * | 2012-07-18 | 2012-12-12 | 哈尔滨工程大学 | Submarine topography data establishment method based on topographical sampling point positions |
| CN102819568B (en) * | 2012-07-18 | 2015-03-11 | 哈尔滨工程大学 | Submarine topography data establishment method based on topographical sampling point positions |
| CN105912638A (en) * | 2016-04-08 | 2016-08-31 | 苏州中科图新网络科技有限公司 | Oblique photograph data storage and scheduling method and apparatus |
| CN107730583A (en) * | 2017-10-26 | 2018-02-23 | 浙江科澜信息技术有限公司 | A kind of terrain tile data dynamic dispatching method and device based on three-dimensional scenic |
| CN107730583B (en) * | 2017-10-26 | 2021-02-26 | 浙江科澜信息技术有限公司 | Three-dimensional scene-based terrain tile data dynamic scheduling method and device |
| CN108763434A (en) * | 2018-05-24 | 2018-11-06 | 国网上海市电力公司 | One kind matching the multi-source heterogeneous information model data system of electricity consumption |
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Application publication date: 20110706 |