CN107292960A - A kind of Local hydrodynamic unit method that large-scale terrain is rendered in three-dimensional scenic - Google Patents
A kind of Local hydrodynamic unit method that large-scale terrain is rendered in three-dimensional scenic Download PDFInfo
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- CN107292960A CN107292960A CN201710523563.2A CN201710523563A CN107292960A CN 107292960 A CN107292960 A CN 107292960A CN 201710523563 A CN201710523563 A CN 201710523563A CN 107292960 A CN107292960 A CN 107292960A
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- terrain
- dimensional scenic
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- shaped area
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/05—Geographic models
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/005—General purpose rendering architectures
Abstract
The present invention proposes the Local hydrodynamic unit method that large-scale terrain in a kind of three-dimensional scenic is rendered, and it comprises the following steps：Step 1, the local shaped area to needs loading are pre-processed；Step 2, acquisition have overlapping each level terrain tile with the local shaped area；Step 3, the Refresh Data for realizing local shaped area.During by the invention enables loading local terrain data in three-dimensional scenic, without reloading all terrain datas, being updated only for the local terrain block for needing to load, reducing the data dispatch time, it is ensured that the refresh rate of loading terrain data.
Description
Technical field
The present invention relates to Spatial GIS technical field, large-scale terrain wash with watercolours in more particularly to a kind of three-dimensional scenic
The Local hydrodynamic unit method of dye.
Technical background
In current Three-dimensional Terrain Visualization system, graphic data is typically to build terrain tile pyramid mould on a large scale
Type, is organized with quad-tree structure to terrain tile, and it is then all in scene by asking to load terrain data
Terrain data, newly-increased data set is merged with raw data set, reloads all terrain datas to complete.In most cases,
The local terrestrial range of loading is only the subrange of a very little of whole terrestrial ranges, allows all terrain tile refresh alls
The time of data dispatch can be increased, reduction refreshes efficiency.Accordingly, it would be desirable to which a kind of method only refreshes part in the local landform of loading
Region where landform.
The content of the invention
The invention provides the Local hydrodynamic unit method that large-scale terrain in a kind of three-dimensional scenic is rendered, only brushed during loading landform
New part terrain block, without reloading all terrain datas, when solving to load local landform in current terrain visualization system
The problem of refreshing inefficiency of appearance.
The present invention proposes the Local hydrodynamic unit method that large-scale terrain in a kind of three-dimensional scenic is rendered, and it includes following step
Suddenly：
Step 1, the local shaped area to needs loading are pre-processed；
Step 2, acquisition have overlapping each level terrain tile with the local shaped area；
Step 3, the Refresh Data for realizing local shaped area.
Wherein, the step 1 is specifically included：
Delineation needs the rectangular extent x of the local shaped area loadedmin, xmax, ymin, ymax, wherein subscript min represents
Minimum value, subscript max represents maximum.
Wherein, the step 2 is specifically included：
The rectangular extent is done into mutually shipping for two-dimensional coordinate with all terrain tiles loaded in the three-dimensional scenic
Calculate, and determine whether overlapping region, the terrain tile for having overlapping region is preserved, and by the landform watt in the three-dimensional scenic
Piece traversal is finished, and obtains the set for having overlapping each level terrain tile with the local shaped area.
Wherein, described do the rectangular extent with all terrain tiles loaded in the three-dimensional scenic is mutually shipped
Calculate, and the terrain tile traversal in the three-dimensional scenic is finished and specifically included：
Judge that the rectangular extent whether there is overlapping region with all terrain tiles loaded in the three-dimensional scenic,
If without overlapping region, demonstrating the need for the local shaped area of loading not in the terrestrial range of the three-dimensional scenic；
If the rectangular extent has overlapping region with some terrain tile loaded in the three-dimensional scenic, protect
The layer of the terrain tile, column and row, data area information are deposited, and judges whether that it possesses sub- terrain tile, if there is sub- landform
Tile, then travel through sub- terrain tile, until having traveled through the shaped area comprising needs loading in the three-dimensional scenic minimally
Shape tile, collects the formation terrain tile set of above terrain tile information.
Wherein, the step 3 is specially：
By establishment terrain tile module construction each landform in the set of each level terrain tile as described in above-mentioned step 2
The new data set of tile, it is correspondingly replaced the pre-existing topography tile in the three-dimensional scenic.
The useful achievement of the present invention
During by the invention enables loading local terrain data in three-dimensional scenic, without reloading all terrain datas,
It is updated only for the local terrain block for needing to load, reduces the data dispatch time, it is ensured that the brush of loading terrain data
New speed.
Brief description of the drawings
Fig. 1 is that three-dimensional scenic large-scale terrain renders the method stream of middle Local hydrodynamic unit for realize consistent with the embodiment of the present invention
Cheng Tu.
Specific embodiment
For realize consistent with the specific embodiment of the invention, three-dimensional scenic large-scale terrain renders middle local brush as shown in Figure 1
New method flow diagram.Each level tile is each level tile data collection in accompanying drawing.
When local terrain data refreshes in real time, comprise the following steps that：
Local shaped area is pre-processed, the rectangular extent xmin, xmax, ymin, ymax of landform need to be loaded by getting；
The rectangular extent is done with the terrain tile scope in scene and intersects computing, if non-overlapping region, illustrates loading
Local shaped area is absent from the scene in the terrestrial range of scape, without carrying out Local hydrodynamic unit；If there is overlapping region, the terrain tile is preserved
The information such as layer, column and row, data area, and traveled through to sub- terrain tile, repeat step 2, until traversing in scene comprising being intended to
Load the minimum terrain tile of shaped area；
What is obtained in step 2 is the terrain tile of each level needs renewal in scene, these landform watt of re-request
The data set (including image and elevation) of piece, builds new terrain tile, replaces original terrain tile in scene, you can on the scene
The Local hydrodynamic unit of landform is realized in scape.
Wherein, it is consistent with the embodiment of the present invention, judge whether intersecting a certain algorithm can be for two rectangular areas：
Assuming that two rectangular areas represent that rectangle A is expressed as (minxA, minyA) by its maximin point respectively,
(maxxA, maxyA), rectangle B is expressed as (minxB, minyB), (maxxB, maxyB), if two rectangles have overlapping region,
The maximin point of overlapping region can be expressed as (minx, miny), (maxx, maxy), wherein minx, miny, maxx,
Maxy is respectively
Minx=max (minxA, minxB)
Miny=max (minyA, minyB)
Maxx=min (maxxA, maxxB)
Maxy=min (maxyA, maxyB)
If minx>Maxx, or miny>Maxy, illustrates that overlapping region is not present, and the two rectangles are non-intersect.
Embodiment 1
Assuming that needing to load local Hangzhou terrain data collection in the three-dimensional scenic in the whole world, according to step 1, office is got
Two-dimensional rectangle scope xmin, xmax, ymin, the ymax of the Hangzhou landform in portion, wherein x represent its longitudinal, and y represents its latitude
Direction.According to step 2, the rectangular extent is done with the terrain tile loaded in scene and intersects computing, and to sub- terrain tile
Traversal, obtaining getting all in scene and rectangular extent has the terrain tile of overlapping region；According to step 3, rebuild
The image of these terrain tiles and altitude data collection, build new terrain tile, correspondingly replace original landform watt in scene
Piece, that is, complete the Local hydrodynamic unit of Hangzhou landform.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is limited by claim and its equivalent.
Claims (5)
1. a kind of Local hydrodynamic unit method that large-scale terrain is rendered in three-dimensional scenic, it comprises the following steps：
Step 1, the local shaped area to needs loading are pre-processed；
Step 2, acquisition have overlapping each level terrain tile with the local shaped area；
Step 3, the Refresh Data for realizing local shaped area.
2. the Local hydrodynamic unit method that large-scale terrain is rendered in three-dimensional scenic as claimed in claim 1, wherein the step 1 is specific
Including：
Delineation needs the rectangular extent x of the local shaped area loadedmin, xmax, ymin, ymax, wherein subscript min represents minimum
Value, subscript max represents maximum.
3. the Local hydrodynamic unit method that large-scale terrain is rendered in three-dimensional scenic as claimed in claim 1, wherein the step 2 is specific
Including：
The rectangular extent is intersected into computing with all terrain tile two-dimensional coordinates loaded in the three-dimensional scenic, and
Overlapping region is determined whether, the terrain tile for having overlapping region is preserved, and by the terrain tile time in the three-dimensional scenic
Go through and finish, obtain the set for having overlapping each level terrain tile with the local shaped area.
4. the Local hydrodynamic unit method that large-scale terrain is rendered in three-dimensional scenic as claimed in claim 3, wherein described by the rectangle
Scope is done with all terrain tiles loaded in the three-dimensional scenic intersects computing, and by the landform in the three-dimensional scenic
Tile traversal, which is finished, to be specifically included：
Judge that the rectangular extent whether there is overlapping region with all terrain tiles loaded in the three-dimensional scenic, if
There is no overlapping region, then demonstrate the need for the local shaped area of loading not in the terrestrial range of the three-dimensional scenic；
If the rectangular extent has overlapping region with some terrain tile loaded in the three-dimensional scenic, preserving should
The layer of terrain tile, column and row, data area information, and judge whether that it possesses sub- terrain tile, if there is sub- landform watt
Piece, then travel through sub- terrain tile, includes the minimum landform for the shaped area for needing to load in the three-dimensional scenic until having traveled through
Tile, collects the formation terrain tile set of above terrain tile information.
5. the Local hydrodynamic unit method that large-scale terrain is rendered in three-dimensional scenic as claimed in claim 3, wherein the step 3 is specific
For：
By establishment terrain tile module construction each terrain tile in the set of each level terrain tile as described in above-mentioned step 2
New data set, it is correspondingly replaced to the pre-existing topography tile in the three-dimensional scenic.
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| CN108363569A (en) * | 2018-03-07 | 2018-08-03 | 腾讯科技（深圳）有限公司 | Image frame generating method, device, equipment and storage medium in |
| CN109147035A (en) * | 2018-08-03 | 2019-01-04 | 上海电气集团股份有限公司 | The display methods and system of threedimensional model |
| CN110544306A (en) * | 2019-08-29 | 2019-12-06 | 中国南方电网有限责任公司 | three-dimensional terrain data acquisition method and device, computer equipment and storage medium |
| CN111260780A (en) * | 2020-01-13 | 2020-06-09 | 陕西心像信息科技有限公司 | Real-time terrain modification method based on elevation of altitude map |
| CN112465962A (en) * | 2021-01-15 | 2021-03-09 | 宝略科技(浙江)有限公司 | Dynamic updating method for large-scene three-dimensional live-action data |
| CN112732851A (en) * | 2020-12-30 | 2021-04-30 | 威创集团股份有限公司 | Method, system and medium for matching visual state of layer between two-dimensional map and three-dimensional map |
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| CN108363569A (en) * | 2018-03-07 | 2018-08-03 | 腾讯科技（深圳）有限公司 | Image frame generating method, device, equipment and storage medium in |
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| CN110544306A (en) * | 2019-08-29 | 2019-12-06 | 中国南方电网有限责任公司 | three-dimensional terrain data acquisition method and device, computer equipment and storage medium |
| CN111260780A (en) * | 2020-01-13 | 2020-06-09 | 陕西心像信息科技有限公司 | Real-time terrain modification method based on elevation of altitude map |
| CN111260780B (en) * | 2020-01-13 | 2021-04-16 | 陕西心像信息科技有限公司 | Real-time terrain modification method based on elevation of altitude map |
| CN112732851A (en) * | 2020-12-30 | 2021-04-30 | 威创集团股份有限公司 | Method, system and medium for matching visual state of layer between two-dimensional map and three-dimensional map |
| CN112732851B (en) * | 2020-12-30 | 2024-04-02 | 威创集团股份有限公司 | Method, system and medium for matching visual states of layers between two-dimensional map and three-dimensional map |
| CN112465962A (en) * | 2021-01-15 | 2021-03-09 | 宝略科技(浙江)有限公司 | Dynamic updating method for large-scene three-dimensional live-action data |
| CN112465962B (en) * | 2021-01-15 | 2021-06-08 | 宝略科技(浙江)有限公司 | Dynamic updating method for large-scene three-dimensional live-action data |
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