CN104867174B - A kind of three-dimensional map rendering indication method and system - Google Patents
A kind of three-dimensional map rendering indication method and system Download PDFInfo
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Abstract
The embodiment of the invention discloses three-dimensional map rendering indication method, including：According to the map position information of current view point, model file corresponding to current scene model is called；Data wherein in model file are cached in the form of octree structure；Centrum is regarded by octree structure combination current view point, using default visibility judge algorithm all nodes inside current scene model are carried out with level of detail LoD visibility judge, centrum visible node and child node within sweep of the eye are regarded into current view point to mark out in model file；According to the visible node and child node of mark, to entering being rendered and shown depending on centrum scene within the vision for current view point.The invention also discloses a kind of three-dimensional map to render display system, using the present invention, improves rendering efficiency, reduces network traffics, and realization allows large-scale point cloud data to show user by Web 3-D technologies.
Description
Technical field
The present invention relates to computer network communication field, more particularly to a kind of three-dimensional map rendering indication method and dimensionally
Figure renders display system.
Background technology
Existing three-dimensional map technology mainly uses triangle grid model to be shown.It can divide from data source
For three-dimensional reconstruction and the interactive three-dimensional two methods of reconstruction of point cloud half of taking photo by plane.The Here maps and Google Earth of Nokia all use
Be threedimensional model that aerial images three-dimensional reconstruction obtains, then pass through level of detail (LoD, Level of Detial)
The information such as the building in city are showed user by technology, as shown in Figure 1 the displaying schematic diagram of three-dimensional map in the prior art.
The point cloud gathered by streetscape optical detection with measurement (Lidar, Light Detection And Ranging) equipment
Data are also applied in three-dimensional map.But these cloud datas mainly pass through some artificial treatment technology combination three-dimensional reconstructions
Technology generates streetscape triangle gridding.The Chinese Academy of Sciences as shown in Figure 2 Shenzhen Advanced Technology Laboratories utilize the collection of LiDar equipment
Point cloud obtains three-dimensional map using the semi-automatic three-dimensional reconstructions of SmartBox, achieves relatively good effect.
With the raising of LiDar device measuring precision, cloud data that many measuring apparatus obtain has reached can be with
The level directly shown, this allows three-dimensional point cloud to provide the user premise directly as model display.However, in the prior art,
Take photo by plane threedimensional model the problem of be model resolution ratio it is relatively low, the distant view in city can only be reappeared, can not accomplish to streetscape carry out
Three-dimensional range.And need using semi-automatic reconstruction technique to expend substantial amounts of manpower by streetscape point cloud equipment, automaticity is too
It is low, and the part that can not largely rebuild be present, for example, billboard, street lamp trees etc. some rebuild costs it is especially big but again
Very important details, finally make it that data processing cost is quite big.
Therefore, because needing cloud data amount to be processed huge, show that three-dimensional point cloud streetscape is also present very by Web ends
More problems, it can not realize also currently and allow large-scale point cloud data to show user by Web 3-D technologies.
The content of the invention
Technical problem to be solved of the embodiment of the present invention is, there is provided a kind of three-dimensional map rendering indication method and three-dimensional
Map renders display system, can be achieved to allow large-scale point cloud data to show user by Web 3-D technologies.
In order to solve the above-mentioned technical problem, first aspect of the embodiment of the present invention discloses a kind of three-dimensional map and renders display side
Method, including：
According to the map position information of current view point, model file corresponding to current scene model is called；Wherein described mould
Data in type file are cached in the form of octree structure；
Centrum is regarded by the octree structure combination current view point, using default visibility judge algorithm to current
All nodes inside model of place carry out level of detail LoD visibility judge, are entered with marking out in the model file
Current view point regards centrum visible node and child node within sweep of the eye；
According to the visible node and child node of mark, to regarding centrum field within the vision into current view point
Scape is rendered and shown.
With reference in a first aspect, in the first possible implementation, the map position information according to current view point,
Before calling model file corresponding to current scene model, in addition to：
Framing processing is carried out to the three-dimensional point cloud streetscape data of acquisition by QuadKey, it is corresponding to generate each model of place
Model file.
With reference to the first possible implementation of first aspect, in second of possible implementation, the basis
The map position information of current view point, model file corresponding to current scene model is called, including：
Read longitude and latitude corresponding to the map position information of current view point；
Tile coordinate corresponding to the longitude and latitude read is searched, and the current view point is obtained according to the tile coordinate
Map location corresponding to tile；
The path of model file corresponding to current scene model is obtained by the tile, and passes through the model file
Path is called in model file in the renewal queue of current scene model.
With reference to second of possible implementation of first aspect, in the third possible implementation, described pair is entered
After entering being rendered and shown depending on centrum scene within the vision of current view point, in addition to：
Receive the roam operation information to the viewpoint of input；
According to the distance of viewpoint control described in the roam operation information analysis, and judge whether the distance reaches first
Predetermined threshold value；
When judged result is to be, longitude and latitude corresponding to the map position information of the reading current view point is re-executed
Step.
It is described to pass through in the 4th kind of possible implementation with reference to the third possible implementation of first aspect
After the path of the model file is called in model file in the renewal queue of current scene model, in addition to：
The centrum scene within the vision that regards not in the current view point is removed into the renewal queue.
It is described to be cached in the form of octree structure with reference in a first aspect, in the 5th kind of possible implementation
Data node or child node are provided with node serial number, and according to the node serial number be buffered in disk；
The visible node and child node according to mark, to regarding centrum within sweep of the eye into current view point
Scene rendered and shown, including：
Obtain out the visible node node serial number corresponding with child node of mark；
Visible node caching text corresponding with child node is found out from disk according to the node serial number of the acquisition
Part, and according to the cache file to entering being rendered and shown depending on centrum scene within the vision for current view point.
With reference in a first aspect, either second of the first possible implementation or first aspect of first aspect
Possible implementation, either the 4th kind of the third possible implementation or first aspect of first aspect is possible
Implementation, or the 5th kind of possible implementation of first aspect, in the 6th kind of possible implementation, the use
Default visibility judge algorithm carries out level of detail LoD visibility judge to all nodes inside current scene model,
Including：
Judge whether the node center distance of current level reaches the second predetermined threshold value with the ratio of bounding box radius；Wherein
The node center is apart from the bounding box central point for current Hierarchy nodes in current scene model to the distance of current view point, institute
State bounding box radius of the bounding box radius for current Hierarchy nodes in the current scene model；
When judged result for when being, then the node marked out in current scene model is visible, and will be in the node
All child nodes of next level return as current Hierarchy nodes and perform the node center distance for judging current level
The step of whether reaching the second predetermined threshold value with the ratio of bounding box radius；Otherwise, the section in current scene is not marked out
Point is visible.
Second aspect of the embodiment of the present invention discloses a kind of three-dimensional map and renders display system, including：
Model file calling module, for the map position information according to current view point, call current scene model corresponding
Model file；Data in wherein described model file are cached in the form of octree structure；
Visibility judge module, for regarding centrum by the octree structure combination current view point, use is default
Visibility judge algorithm carries out level of detail LoD visibility judge to all nodes inside current scene model, with mark
Go out in the model file and regard centrum visible node and child node within sweep of the eye into current view point；
Scene rendering display module, for the visible node and child node according to mark, into current view point
Rendered and shown depending on centrum scene within the vision.
With reference to second aspect, in the first possible implementation, in addition to：
Model file generation module, for being believed in the model file calling module according to the map location of current view point
Breath, before calling model file corresponding to current scene model, the three-dimensional point cloud streetscape data of acquisition are carried out by QuadKey
Framing processing, generates model file corresponding to each model of place.
With reference to the first possible implementation of second aspect, in second of possible implementation, the model
File calling module includes：
Longitude and latitude reading unit, for reading longitude and latitude corresponding to the map position information of current view point；
Acquiring unit is searched, is sat for searching tile coordinate corresponding to the longitude and latitude read, and according to the tile
Mark obtains tile corresponding to the map location of the current view point；
Unit is called in, for obtaining the path of model file corresponding to current scene model by the tile, and is passed through
The path of the model file is called in model file in the renewal queue of current scene model.
With reference to second of possible implementation of second aspect, in the third possible implementation, in addition to：
Information receiving module, for regarding centrum field range to entrance current view point in the scene rendering display module
After interior scene is rendered and shown, the roam operation information to the viewpoint of input is received；
Distance Judgment module, for the distance of the viewpoint control according to the roam operation information analysis, and judge institute
State whether distance reaches the first predetermined threshold value；And when judged result for when being, longitude and latitude reading unit described in retriggered performs
Corresponding to the map position information for reading current view point the step of longitude and latitude.
With reference to the third possible implementation of second aspect, in the 4th kind of possible implementation, in addition to：
Queue remove module, for it is described call in unit and called in model file by the path of the model file work as
After in the renewal queue of preceding model of place, by not regarding described in centrum scene removal within the vision in the current view point
Update queue.
It is described to be cached in the form of octree structure in the 5th kind of possible implementation with reference to second aspect
Data node or child node are provided with node serial number, and according to the node serial number be buffered in disk；
The scene rendering display module includes：
Node serial number acquiring unit, the visible node node corresponding with child node for obtaining out mark are compiled
Number；
Display unit is rendered, for finding out the visible node and son from disk according to the node serial number of the acquisition
Cache file corresponding to node, and according to the cache file to entering entering depending on centrum scene within the vision for current view point
Row is rendered and shown.
With reference to second aspect, either second of the possible implementation of the first of second aspect or second aspect
Possible implementation, either the 4th kind of the third possible implementation or second aspect of second aspect is possible
Implementation, or the 5th kind of possible implementation of second aspect, it is described visible in the 6th kind of possible implementation
Property judge module includes：
Ratio in judgement unit, for judging whether the node center distance of current level reaches with the ratio of bounding box radius
Second predetermined threshold value；Wherein described node center distance is that the bounding box central point of current Hierarchy nodes in current scene model arrives
The distance of current view point, the bounding box radius are the bounding box radius of current Hierarchy nodes in the current scene model；
Mark unit, for when judged result for be when, then the node marked out in current scene model is visible, and
, as current Hierarchy nodes, trigger the ratio in judgement unit using in all child nodes of the next level of the node and perform institute
State and the step of whether the node center distance of current level reaches the second predetermined threshold value with the ratio of bounding box radius judged；It is no
Then, the node not marked out in current scene is visible.
The third aspect of the embodiment of the present invention discloses a kind of computer-readable storage medium, and the computer-readable storage medium is stored with
Program, including the possible realization side of the first of first aspect of the embodiment of the present invention or first aspect when described program performs
Formula, either the third possible implementation of the possible implementation of second of first aspect or first aspect, or
4th kind of possible implementation of first aspect, either the 5th of first aspect kind possible implementation or first party
The Overall Steps of three-dimensional map rendering indication method in the 6th kind of possible implementation in face.
Implement the embodiment of the present invention, centrum is regarded by the octree structure combination current view point, using it is default can
Opinion property evaluation algorithm carries out level of detail LoD visibility judge to all nodes inside current scene model, by visible
Node and child node depending on centrum scene within the vision being rendered and being shown to entering current view point, can greatly subtract
Processing data amount is needed less, solves not opening up by Web ends due to needing cloud data amount to be processed huge in the prior art
Show the technical problem of three-dimensional point cloud streetscape；Framing processing is carried out to the three-dimensional point cloud streetscape data of acquisition additionally by QuadKey,
Model file corresponding to generating each model of place, read longitude and latitude corresponding to the map position information of current view point and work as to update
Preceding model of place, rendering efficiency is can further improve, reduce network traffics, realization makes large-scale point cloud data three-dimensional by Web
Technology shows user.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the displaying schematic diagram of three-dimensional map in the prior art；
Fig. 2 is the displaying schematic diagram of the three-dimensional map that semi-automatic three-dimensional reconstruction is established in the prior art；
Fig. 3 is the schematic flow sheet of three-dimensional map rendering indication method provided in an embodiment of the present invention；
Fig. 4 is the method schematic diagram of calling model of place file provided in an embodiment of the present invention；
Fig. 5 is the schematic flow sheet of another embodiment of three-dimensional map rendering indication method provided by the invention；
Fig. 6 is the schematic flow sheet of visibility judge provided in an embodiment of the present invention；
Fig. 7 a are the principle schematics of bounding box and node center provided in an embodiment of the present invention；
Fig. 7 b are the principle schematics of bounding box and node center provided in an embodiment of the present invention；
Fig. 8 is the structural representation that three-dimensional map provided in an embodiment of the present invention renders display system；
Fig. 9 is the structural representation for another embodiment that three-dimensional map provided by the invention renders display system；
Figure 10 is the structural representation of model file calling module provided in an embodiment of the present invention；
Figure 11 is the structural representation for another embodiment that three-dimensional map provided by the invention renders display system；
Figure 12 is the structural representation for another embodiment that three-dimensional map provided by the invention renders display system；
Figure 13 is the structural representation of scene rendering display module provided in an embodiment of the present invention；
Figure 14 is the structural representation of visibility judge module provided in an embodiment of the present invention；
Figure 15 is the structural representation for another embodiment that three-dimensional map provided by the invention renders display system..
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Describe the embodiment of three-dimensional map rendering indication method of the present invention in detail with reference to Fig. 3 to Fig. 7, say
The bright three-dimensional map that how to carry out renders display：
Fig. 3 shows the schematic flow sheet of three-dimensional map rendering indication method provided in an embodiment of the present invention, including：
Step S300：According to the map position information of current view point, model file corresponding to current scene model is called；Its
Described in data in model file cached in the form of octree structure；
Specifically, the viewpoint in the embodiment of the present invention is the point of video camera roaming, that is to say, that user is by Web ends three
Tie up viewpoint when being roamed on map；System is previously stored with model of place corresponding to each viewpoint, and each model of place is corresponding with
Model file, wherein, the data in model file in the embodiment of the present invention are cached in the form of octree structure；
It should be noted that Octree is a kind of tree data structure for being used to describe three dimensions.Octree it is each
Node represents the volume element of a square, and each node has eight child nodes, by the volume element represented by eight child nodes
Element is added together the volume for being equal to father node.The data of model file carry out space stroke by Octree in the embodiment of the present invention
Point, and by the data buffer storage of tree structure to disk, then in the LoD that rendering stage is realized by the Octree data of caching
Process, the pressure of internal memory and network traffic data can be greatly reduced.
Step S302：Centrum is regarded by the octree structure combination current view point, using default visibility judge
Algorithm carries out level of detail LoD visibility judge to all nodes inside current scene model, to mark out the model
In file centrum visible node and child node within sweep of the eye are regarded into current view point；
Specifically, in the embodiment of the present invention viewpoint the visible cone model for referring to video camera in scene depending on centrum
Enclose, it there are upper and lower, left and right, near, remote, totally 6 faces compositions.Scenery in view frustums is visible, on the contrary then invisible.By pre-
If visibility judge algorithm when carrying out visibility judge, can be first by regarding the bounding box of centrum and current scene model interior joint
Common factor analysis is carried out, with reference to Octree tree data structure, if the bounding box of some node and non-intersect, node regarding centrum
And all child nodes are not labeled as visible node under it, or the node and be noted as can not for all child nodes under it
See；If the bounding box of some node intersects with depending on centrum, the observability in the child node of next layer of the node is determined whether,
Not show and (be not labeled as visible) apart from the fine node of the distant comparison of viewpoint as far as possible, and compare apart from viewpoint
The then display (being labeled as visible) as far as possible of near node, this is that process is the process that a level is carried out, until the current field
All nodes in scape model have all carried out visibility judge.
Step S304：According to the visible node and child node of mark, to regarding the centrum visual field into current view point
In the range of scene rendered and shown.
Specifically, system, can be only to entering current view point according to the above-mentioned visible node marked out and child node
Rendered and shown depending on centrum scene within the vision, do not regard centrum within sweep of the eye (i.e. to have left current view point
Not current view point depending on centrum within sweep of the eye) scene rendered and shown.
Implement the embodiment of the present invention, centrum is regarded by the octree structure combination current view point, using it is default can
Opinion property evaluation algorithm carries out level of detail LoD visibility judge to all nodes inside current scene model, by visible
Node and child node depending on centrum scene within the vision being rendered and being shown to entering current view point, can greatly subtract
Processing data amount is needed less, solves not opening up by Web ends due to needing cloud data amount to be processed huge in the prior art
Show the technical problem of three-dimensional point cloud streetscape, realization allows large-scale point cloud data to show user by Web 3-D technologies.
Further, before the step S300 of the embodiment of the present invention, can also include：By QuadKey to acquisition three
Dimension point cloud street scape data carry out framing processing, generate model file corresponding to each model of place.
Specifically, QuadKey is a kind of deblocking method in GIS-Geographic Information System, and its principle is to utilize longitude and latitude
Coordinate system is by data according to grade classification into square area.The embodiment of the present invention is in generation three-dimensional point cloud streetscape data and to this
After cloud data is repaired, framing processing is carried out to the three-dimensional point cloud streetscape data using QuadKey, it is single to generate minimum scheduling
Member, the cloud data for belonging to same spatial dimension is put into model file corresponding to same model of place (equivalent to same
One cloud mass file), all streetscape point cloud models are managed collectively so as to realize, to be subsequently scheduled and to locate to scene
Reason.
Yet further, the method schematic diagram provided in an embodiment of the present invention for calling model of place file as shown in Figure 4,
Describe in detail the present invention how current scene model called according to the map position information of current view point corresponding to model file,
Including：
Step S400：Read longitude and latitude corresponding to the map position information of current view point；
Specifically, before render scenes are started, the map position information of current view point can be first read, is then sat
Mark conversion, obtains longitude and latitude corresponding to the map position information.
Step S402：Tile coordinate corresponding to the longitude and latitude read is searched, and institute is obtained according to the tile coordinate
State tile corresponding to the map location of current view point；
Specifically, system is previously provided with the corresponding relation of longitude and latitude and Tiles tile coordinates, can be with by the corresponding relation
Search and read out Tiles coordinates corresponding to the longitude and latitude of step S400 readings, and video camera can be obtained according to the Tiles coordinates
Neighbouring Tiles, and the generation of final QuadKey set.
Step S404：The path of model file corresponding to current scene model is obtained by the tile, and by described
The path of model file is called in model file in the renewal queue of current scene model.
Specifically, the inquiry mechanism formed by above-mentioned steps, the present invention can obtain the model file in current scene
Path, and they are called in scene update queue, and follow-up scene update process can similarly perform the present invention
The step of Fig. 4 embodiments.
Yet further, with reference to another reality of the three-dimensional map rendering indication method provided by the invention shown in Fig. 5
The schematic flow sheet of example is applied, including：
Step S500：Read longitude and latitude corresponding to the map position information of current view point；
Step S502：Tile coordinate corresponding to the longitude and latitude read is searched, and institute is obtained according to the tile coordinate
State tile corresponding to the map location of current view point；
Step S504：The path of model file corresponding to current scene model is obtained by the tile, and by described
The path of model file is called in model file in the renewal queue of current scene model；
Specifically, above-mentioned steps S500 to step S504 may be referred to the step in above-mentioned Fig. 4 embodiments, no longer superfluous here
State.
Step S506：Centrum is regarded by the octree structure combination current view point, using default visibility judge
Algorithm carries out level of detail LoD visibility judge to all nodes inside current scene model, to mark out the model
In file centrum visible node and child node within sweep of the eye are regarded into current view point；
Step S508：According to the visible node and child node of mark, to regarding the centrum visual field into current view point
In the range of scene rendered and shown；
Specifically, step S506 to S508 may be referred to the step in above-mentioned Fig. 2 embodiments, repeat no more here.
Step S510：Receive the roam operation information to the viewpoint of input；
Specifically, user is operable to moving view point, that is, carries out Map roaming and browse, for example user is by operating mouse
Moving view point, so that viewpoint is moved forward to browse three-dimensional map information along road, then system receives input
To the roam operation information of the viewpoint；
Step S512：According to the distance of viewpoint control described in the roam operation information analysis, and judge that the distance is
It is no to reach the first predetermined threshold value；
Specifically, the input operation of system response user, according to the distance of the roam operation information analysis viewpoint control,
Such as the distance moved forward, if the distance reaches the first predetermined threshold value, first predetermined threshold value can be according to actual conditions
Or the operating experience of technical staff is pre-set, when judging that the distance reaches first predetermined threshold value, then show that this is regarded
The roaming distance of point is not small, it is necessary to be updated to model of place, re-executes step S500, will need what is called in so as to realize
Model file in scene is put into renewal queue, and carries out follow-up processing；When judging that it is first pre- that the distance is not reaching to this
If threshold value, then step S510 can be continued executing with, to judge whether next time needs to be updated model of place.
It should be noted that model file is called in by current field by the path of the model file in the embodiment of the present invention
After in the renewal queue of scape model, it can also include：Centrum scene within the vision will not be regarded in the current view point
Remove the renewal queue.
Yet further, with reference to the schematic flow sheet of the visibility judge provided in an embodiment of the present invention shown in Fig. 6,
Describe in detail and how to use default visibility judge algorithm to carry out level of detail to all nodes inside current scene model
LoD visibility judge, including：
Step S600：Judge that the node center distance of current level is preset with whether the ratio of bounding box radius reaches second
Threshold value；
Specifically, the node center distance in the embodiment of the present invention is the encirclement of current Hierarchy nodes in current scene model
Distance of the box central point to current view point；Bounding box radius is the bounding box half of current Hierarchy nodes in the current scene model
Footpath；The specifically principle schematic of bounding box and node center provided in an embodiment of the present invention as shown in Fig. 7 a, using quaternary tree as
Example illustrates, and the point a in Fig. 7 a is current view point, and each square in Fig. 7 regards a bounding box, a level section as
Bounding box corresponding to the child node for 4 deciles that the bounding box of point can include next level, bounding box radius is outside square
The radius of the minimum circle of encirclement；For example, distance L is bounding box i central point to current view point a node center distance, it is long
It is bounding box i radiuses to spend R；
The embodiment of the present invention can pre-set the second predetermined threshold value, if judge the node center distance of current level with
The ratio of bounding box radius, the i.e. ratio such as L/R in Fig. 7 a reach the second predetermined threshold value, then perform step S602, otherwise hold
Row step S604.
Step S602：The node marked out in current scene model is visible, and will be in the next level of the node
All child nodes as current Hierarchy nodes；
Specifically, the principle signal of another embodiment of the bounding box and node center provided by the invention as shown in Fig. 7 b
Figure, is illustrated, the node in Fig. 7 b is divided into four levels equally by taking quaternary tree as an example；It should be noted that perform every time
Can be first by regarding the bounding box of centrum and current scene model interior joint (such as the first root node, i.e., maximum pros before step S600
The bounding box of shape) common factor analysis is carried out, and after the bounding box of the node depending on centrum with intersecting, just perform step S600；Such as figure
In 7b, bounding box intersects with depending on centrum corresponding to the first root node, and calculates the first root node centre distance and bounding box
The ratio of radius reaches the second predetermined threshold value, then it is visible to mark first root node, then by the next layer of the first root node
Secondary all child nodes are as current Hierarchy nodes, i.e. 4 son squares that largest square in Fig. 7 b is divided into return
Step S600 is performed, i.e., judges whether 4 squares (bounding box of i.e. 4 child nodes) intersect with depending on centrum one by one, judges
Except the upper left corner square not with intersect depending on centrum in addition to, other 3 squares all intersect with depending on centrum, then the upper left corner is just
It is square not to be labeled as visible, then judge that other 3 square node center distances and the ratio of bounding box radius are one by one
It is not no to reach the second predetermined threshold value, and after the second predetermined threshold value is reached, mark out that the node is visible, and continue it will be seen that node
All child nodes of next level are returned and perform step S600 as current Hierarchy nodes, until four levels node all
Judgement finishes；Such as in fig.7b, it is the square with band in figure finally to judge visible node, and with vertical line just
It is square.
Step S604：The node not marked out in current scene is visible.
Yet further, the data cached in the embodiment of the present invention in the form of octree structure are according to node or son
Node is provided with node serial number, and according to the node serial number be buffered in disk；
So the embodiment of the present invention collects the visible node and child node according to mark, to entering current view point
Rendered and shown depending on centrum scene within the vision, can be included：
Obtain out the visible node node serial number corresponding with child node of mark；Compiled according to the node of the acquisition
Visible node cache file corresponding with child node number is found out from disk, and is worked as according to the cache file to entering
Preceding viewpoint is rendered and shown depending on centrum scene within the vision.Asynchronous XMLHttpRequest can specifically be passed through
Node corresponding to mechanism reading.
Implement the embodiment of the present invention, centrum is regarded by the octree structure combination current view point, using it is default can
Opinion property evaluation algorithm carries out level of detail LoD visibility judge to all nodes inside current scene model, by visible
Node and child node depending on centrum scene within the vision being rendered and being shown to entering current view point, can greatly subtract
Processing data amount is needed less, solves not opening up by Web ends due to needing cloud data amount to be processed huge in the prior art
Show the technical problem of three-dimensional point cloud streetscape；Framing processing is carried out to the three-dimensional point cloud streetscape data of acquisition additionally by QuadKey,
Model file corresponding to generating each model of place, read longitude and latitude corresponding to the map position information of current view point and work as to update
Preceding model of place, rendering efficiency is can further improve, reduce network traffics, realization makes large-scale point cloud data three-dimensional by Web
Technology shows user.
For the ease of preferably implementing the such scheme of the embodiment of the present invention, the present invention is also corresponding to provide one kind dimensionally
Figure renders display system, and three-dimensional map provided in an embodiment of the present invention as shown in Figure 8 renders the structural representation of display system,
Three-dimensional map, which renders display system 80, to be included：Model file calling module 800, visibility judge module 802 and scene wash with watercolours
Display module 804 is contaminated, wherein
Model file calling module 800 is used for the map position information according to current view point, calls current scene model pair
The model file answered；Data in wherein described model file are cached in the form of octree structure；
Visibility judge module 802 is used to regard centrum by the octree structure combination current view point, using default
Visibility judge algorithm all nodes inside current scene model are carried out with level of detail LoD visibility judge, with mark
Outpour in the model file and regard centrum visible node and child node within sweep of the eye into current view point；
Scene rendering display module 804 is used for the visible node and child node according to mark, works as forward sight to entering
Point is rendered and shown depending on centrum scene within the vision.
Specifically, three-dimensional map provided by the invention as shown in Figure 9 renders the structure of another embodiment of display system
Schematic diagram, three-dimensional map, which renders display system 80, to be included：Model file calling module 800, the and of visibility judge module 802
Outside scene rendering display module 804, model file generation module 806 can also be included, in model file calling module 800
According to the map position information of current view point, before calling model file corresponding to current scene model, by QuadKey to obtaining
The three-dimensional point cloud streetscape data taken carry out framing processing, generate model file corresponding to each model of place.
Further, the structural representation of model file calling module provided in an embodiment of the present invention as shown in Figure 10,
Model file calling module 800 can include：Longitude and latitude reading unit 8000, search acquiring unit 8002 and call in unit
8004, wherein
Longitude and latitude reading unit 8000 is used to read longitude and latitude corresponding to the map position information of current view point；
Acquiring unit 8002 is searched to be used to search tile coordinate corresponding to the longitude and latitude read, and according to the tile
Coordinate obtains tile corresponding to the map location of the current view point；
The path that unit 8004 is used to obtain model file corresponding to current scene model by the tile is called in, and is led to
The path for crossing the model file is called in model file in the renewal queue of current scene model.
Yet further, three-dimensional map provided by the invention as shown in Figure 11 renders another embodiment of display system
Structural representation, three-dimensional map, which renders display system 80, to be included：Model file calling module 800, visibility judge module
802nd, outside scene rendering display module 804 and model file generation module 806, can also include information receiving module 808 and away from
From judge module 8010, wherein
Information receiving module 808 is used in scene rendering display module 804 to regarding centrum visual field model into current view point
After scene in enclosing is rendered and shown, the roam operation information to the viewpoint of input is received；
Distance Judgment module 8010 is used for the distance of the viewpoint control according to the roam operation information analysis, and judges
Whether the distance reaches the first predetermined threshold value；And when judged result for when being, retriggered longitude and latitude reading unit 8000 is held
Corresponding to the row map position information for reading current view point the step of longitude and latitude.
Yet further, three-dimensional map provided by the invention as shown in Figure 12 renders another embodiment of display system
Structural representation, three-dimensional map, which renders display system 80, to be included：Model file calling module 800, visibility judge module
802nd, scene rendering display module 804, model file generation module 806, information receiving module 808 and Distance Judgment module 8010
Outside, queue remove module 8012 can also be included, for calling in unit 8004 by the path of the model file by model
After file is called in the renewal queue of current scene model, centrum field within the vision will not be regarded in the current view point
Scape removes the renewal queue.
Yet further, the data that the embodiment of the present invention is cached in the form of octree structure save according to node or son
Point is provided with node serial number, and according to the node serial number be buffered in disk；The embodiment of the present invention as shown in Figure 13
The structural representation of the scene rendering display module of offer, scene rendering display module 804 can include：Node serial number obtains single
Member 8040 and renders display unit 8042, wherein
Node serial number acquiring unit 8040 is used for the visible node node corresponding with child node for obtaining out mark
Numbering；
Display unit 8042 is rendered to be used to find out the visible node from disk according to the node serial number of the acquisition
Cache file corresponding with child node, and according to the cache file to regarding centrum field within the vision into current view point
Scape is rendered and shown.
Yet further, the structural representation of visibility judge module provided in an embodiment of the present invention as shown in Figure 14,
Visibility judge module 802 can include：Ratio in judgement unit 8020 and mark unit 8022, wherein
Ratio in judgement unit 8020 be used to judging the node center distance of current level and bounding box radius ratio whether
Reach the second predetermined threshold value；Wherein described node center distance is the bounding box center of current Hierarchy nodes in current scene model
For point to the distance of current view point, the bounding box radius is the bounding box half of current Hierarchy nodes in the current scene model
Footpath；
Mark unit 8022 is used for when judged result for when being, then the node marked out in current scene model can
See, and, as current Hierarchy nodes, the ratio in judgement unit is triggered using in all child nodes of the next level of the node
Whether the ratio for performing the node center distance for judging current level and bounding box radius reaches the step of the second predetermined threshold value
Suddenly；Otherwise, the node not marked out in current scene is visible.
Figure 15 is referred to, Figure 15 is that the structure for another embodiment that three-dimensional map provided by the invention renders display system is shown
It is intended to.Wherein, as shown in figure 15, three-dimensional map renders display system 150 and can included：At least one processor 1501, such as
CPU, at least one network interface 1504, user interface 1503, memory 1505, at least one communication bus 1502 and display
Screen 1506.Wherein, communication bus 1502 is used to realize the connection communication between these components.Wherein, user interface 1503 can be with
Including keyboard or mouse etc..Network interface 1504 can optionally include wireline interface, wave point (such as WI-FI of standard
Interface).Memory 1505 can be high-speed RAM memory or non-labile memory (non-volatile
Memory), a for example, at least magnetic disk storage, memory 1505 include the flash in the embodiment of the present invention.Memory 1505
It optionally can also be at least one storage system for being located remotely from aforementioned processor 1501.As shown in figure 15, counted as one kind
Operating system, network communication module, Subscriber Interface Module SIM and three-dimensional can be included in the memory 1505 of calculation machine storage medium
Map renders display program.
Processor 1501 can be used for calling the data processor stored in memory 1505, and perform following operate：
According to the map position information of current view point, model file corresponding to current scene model is called；Wherein described mould
Data in type file are cached in the form of octree structure；
Centrum is regarded by the octree structure combination current view point, using default visibility judge algorithm to current
All nodes inside model of place carry out level of detail LoD visibility judge, are entered with marking out in the model file
Current view point regards centrum visible node and child node within sweep of the eye；
According to the visible node and child node of mark, to regarding centrum field within the vision into current view point
Scape is rendered and shown.
Specifically, processor 1501 calls mould corresponding to current scene model according to the map position information of current view point
Before type file, it can also carry out：
Framing processing is carried out to the three-dimensional point cloud streetscape data of acquisition by QuadKey, it is corresponding to generate each model of place
Model file.
Further, processor 1501 is called corresponding to current scene model according to the map position information of current view point
Model file, including：
Read longitude and latitude corresponding to the map position information of current view point；
Tile coordinate corresponding to the longitude and latitude read is searched, and the current view point is obtained according to the tile coordinate
Map location corresponding to tile；
The path of model file corresponding to current scene model is obtained by the tile, and passes through the model file
Path is called in model file in the renewal queue of current scene model.
Yet further, processor 1501 is to entering being rendered simultaneously depending on centrum scene within the vision for current view point
After display, it can also carry out：
Receive the roam operation information to the viewpoint of input；
According to the distance of viewpoint control described in the roam operation information analysis, and judge whether the distance reaches first
Predetermined threshold value；
When judged result is to be, longitude and latitude corresponding to the map position information of the reading current view point is re-executed
Step.
Yet further, model file is called in current scene model by processor 1501 by the path of the model file
Renewal queue in after, can also carry out：
The centrum scene within the vision that regards not in the current view point is removed into the renewal queue.
Yet further, the data cached in the form of octree structure are provided with according to node or child node
Node serial number, and according to the node serial number be buffered in disk；
Processor 1501 regards the centrum visual field according to the visible node and child node of mark to entrance current view point
In the range of scene rendered and shown, including：
Obtain out the visible node node serial number corresponding with child node of mark；
Visible node caching text corresponding with child node is found out from disk according to the node serial number of the acquisition
Part, and according to the cache file to entering being rendered and shown depending on centrum scene within the vision for current view point.
Yet further, processor 1501 uses default visibility judge algorithm to all inside current scene model
Node carries out level of detail LoD visibility judge, including：
Judge whether the node center distance of current level reaches the second predetermined threshold value with the ratio of bounding box radius；Wherein
The node center is apart from the bounding box central point for current Hierarchy nodes in current scene model to the distance of current view point, institute
State bounding box radius of the bounding box radius for current Hierarchy nodes in the current scene model；
When judged result for when being, then the node marked out in current scene model is visible, and will be in the node
All child nodes of next level return as current Hierarchy nodes and perform the node center distance for judging current level
The step of whether reaching the second predetermined threshold value with the ratio of bounding box radius；Otherwise, the section in current scene is not marked out
Point is visible.
It should be noted that the three-dimensional map in the embodiment of the present invention renders display system 80 or three-dimensional map renders display
The function of each functional module of system 150 can implement according to the method in above method embodiment, and it implements process
The associated description of above method embodiment is referred to, here is omitted.
In summary, centrum is regarded by the octree structure combination current view point, using default visibility judge
Algorithm carries out level of detail LoD visibility judge to all nodes inside current scene model, by visible node with
To entering being rendered and shown depending on centrum scene within the vision for current view point, can greatly reduce needs to locate child node
Data volume is managed, solves that three-dimensional point can not be shown by Web ends due to needing cloud data amount to be processed huge in the prior art
The technical problem of cloud street scape；Framing processing is carried out to the three-dimensional point cloud streetscape data of acquisition additionally by QuadKey, generation is each
Model file corresponding to model of place, longitude and latitude corresponding to the map position information of current view point is read to update current scene mould
Type, rendering efficiency is can further improve, reduce network traffics, realization allows large-scale point cloud data to be shown by Web 3-D technologies
To user.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Above disclosure is only preferred embodiment of present invention, can not limit the right model of the present invention with this certainly
Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (12)
- A kind of 1. three-dimensional map rendering indication method, it is characterised in that including：According to the map position information of current view point, model file corresponding to current scene model is called；Wherein described model text Data in part are cached in the form of octree structure；Centrum is regarded by the octree structure combination current view point, using default visibility judge algorithm to current scene All nodes inside model carry out level of detail LoD visibility judge, are entered currently with marking out in the model file Viewpoint regards centrum visible node and child node within sweep of the eye；According to the visible node and child node of mark, to entering entering depending on centrum scene within the vision for current view point Row is rendered and shown；It is described that level of detail LoD's is carried out to all nodes inside current scene model using default visibility judge algorithm Visibility judge, including：Judge whether the node center distance of current level reaches the second predetermined threshold value with the ratio of bounding box radius；It is wherein described Node center is apart from the bounding box central point for current Hierarchy nodes in current scene model to the distance of current view point, the bag Enclose bounding box radius of the box radius for current Hierarchy nodes in the current scene model；When judged result for when being, then the node marked out in current scene model is visible, and will be next in the node All child nodes of individual level return as current Hierarchy nodes and perform the node center distance and bag for judging current level The step of whether ratio of box radius reaches the second predetermined threshold value enclosed；Otherwise, the node not marked out in current scene can See.
- 2. the method as described in claim 1, it is characterised in that the map position information according to current view point, call and work as Before model file corresponding to preceding model of place, in addition to：Framing processing is carried out to the three-dimensional point cloud streetscape data of acquisition by QuadKey, generates mould corresponding to each model of place Type file.
- 3. method as claimed in claim 2, it is characterised in that the map position information according to current view point, call and work as Model file corresponding to preceding model of place, including：Read longitude and latitude corresponding to the map position information of current view point；Tile coordinate corresponding to the longitude and latitude read is searched, and the ground of the current view point is obtained according to the tile coordinate The tile of figure position correspondence；The path of model file corresponding to current scene model is obtained by the tile, and passes through the path of the model file Model file is called in the renewal queue of current scene model.
- 4. method as claimed in claim 3, it is characterised in that described pair enters the within the vision regarding centrum of current view point After scene is rendered and shown, in addition to：Receive the roam operation information to the viewpoint of input；According to the distance of viewpoint control described in the roam operation information analysis, and it is default to judge whether the distance reaches first Threshold value；When judged result is to be, the step of longitude and latitude corresponding to the map position information of the reading current view point is re-executed Suddenly.
- 5. method as claimed in claim 4, it is characterised in that model file is adjusted in the path by the model file After entering in the renewal queue of current scene model, in addition to：The centrum scene within the vision that regards not in the current view point is removed into the renewal queue.
- 6. the method as described in claim 1, it is characterised in that the data cached in the form of octree structure by Node or child node are provided with node serial number, and according to the node serial number be buffered in disk；The visible node and child node according to mark, to regarding centrum field within the vision into current view point Scape is rendered and shown, including：Obtain out the visible node node serial number corresponding with child node of mark；Visible node cache file corresponding with child node is found out from disk according to the node serial number of the acquisition, and According to the cache file to entering being rendered and shown depending on centrum scene within the vision for current view point.
- 7. a kind of three-dimensional map renders display system, it is characterised in that including：Model file calling module, for the map position information according to current view point, call mould corresponding to current scene model Type file；Data in wherein described model file are cached in the form of octree structure；Visibility judge module, for regarding centrum by the octree structure combination current view point, using default visible Property evaluation algorithm all nodes inside current scene model are carried out with level of detail LoD visibility judge, to mark out State in model file and regard centrum visible node and child node within sweep of the eye into current view point；Scene rendering display module, for the visible node and child node according to mark, to being regarded into current view point Centrum scene within the vision is rendered and shown；The visibility judge module includes：Ratio in judgement unit, for judging whether the node center distance of current level reaches second with the ratio of bounding box radius Predetermined threshold value；Wherein described node center distance is the bounding box central point of current Hierarchy nodes in current scene model to currently The distance of viewpoint, the bounding box radius are the bounding box radius of current Hierarchy nodes in the current scene model；Unit is marked, during for being when judged result, then the node marked out in current scene model is visible, and will be All child nodes of the next level of node are triggered and sentenced described in the ratio in judgement unit execution as current Hierarchy nodes The step of whether the node center distance of current level of breaking and the ratio of bounding box radius reach the second predetermined threshold value；Otherwise, no The node marked out in current scene is visible.
- 8. system as claimed in claim 7, it is characterised in that also include：Model file generation module, for the map position information in the model file calling module according to current view point, adjust Before the model file corresponding to current scene model, framing is carried out to the three-dimensional point cloud streetscape data of acquisition by QuadKey Processing, generates model file corresponding to each model of place.
- 9. system as claimed in claim 8, it is characterised in that the model file calling module includes：Longitude and latitude reading unit, for reading longitude and latitude corresponding to the map position information of current view point；Acquiring unit is searched, for searching tile coordinate corresponding to the longitude and latitude read, and is obtained according to the tile coordinate Take tile corresponding to the map location of the current view point；Unit is called in, for obtaining the path of model file corresponding to current scene model by the tile, and by described The path of model file is called in model file in the renewal queue of current scene model.
- 10. system as claimed in claim 9, it is characterised in that also include：Information receiving module, within the vision regarding centrum to entrance current view point in the scene rendering display module After scene is rendered and shown, the roam operation information to the viewpoint of input is received；Distance Judgment module, for the distance of the viewpoint control according to the roam operation information analysis, and judge it is described away from From whether reaching the first predetermined threshold value；And when judged result is to be, described in longitude and latitude reading unit execution described in retriggered The step of reading longitude and latitude corresponding to the map position information of current view point.
- 11. system as claimed in claim 10, it is characterised in that also include：Queue remove module, for model file to be called in into current field by the path of the model file in the unit of calling in After in the renewal queue of scape model, the centrum scene within the vision that regards not in the current view point is removed into the renewal Queue.
- 12. system as claimed in claim 7, it is characterised in that the data cached in the form of octree structure Node or child node are provided with node serial number, and according to the node serial number be buffered in disk；The scene rendering display module includes：Node serial number acquiring unit, for obtaining out the visible node node serial number corresponding with child node of mark；Display unit is rendered, for finding out the visible node and child node from disk according to the node serial number of the acquisition Corresponding cache file, and wash with watercolours is carried out to the centrum scene within the vision that regards for entering current view point according to the cache file Contaminate and show.
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