CN113901062A - Pre-loading system based on BIM and GIS - Google Patents
Pre-loading system based on BIM and GIS Download PDFInfo
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Abstract
A BIM and GIS based preloading system comprises a rendering server and a storage server which are in communication connection, wherein the rendering server comprises a processor and a storage medium which stores a computer program; when executed by a processor, the computer program performs the steps of: acquiring K pre-loaded viewpoint positions VP at preset N moments of a roaming highway; traverse the BIM index, if indexing BIMiBmin (b)iAnd BmaxiAre all located in VPjIn the corresponding view cone, then BIMiCorresponding BIDiAdding to VPjBIM model index List IDXjPerforming the following steps; when the viewpoint roams to VPj‑1Then, and IDXjThe corresponding BIM model does not exist in the rendering clothesWhile in the cache of the server, loading IDX from the storage serverjThe corresponding BIM model is cached in a rendering server; when the viewpoint roams to VPjWhile, rendering IDXjCorresponding BIM model in (1). The invention can improve the loading efficiency and reduce the performance configuration.
Description
Technical Field
The application relates to the high-speed field of wisdom, concretely relates to preloading system based on BIM and GIS.
Background
At present, a highway coverage area is a long and narrow area, an unmanned aerial vehicle oblique photography is adopted to be matched with automatic three-dimensional modeling software to establish a three-dimensional live-action model, and a BIM modeling technology is adopted to establish a fine three-dimensional model for main road facilities such as a main road, an interchange, a ramp, a toll station, a service area and the like, road accessory facilities such as a guardrail, a vertical rod, an anti-glare plate and a crossing span, and equipment such as an information plate, a monitor, a bayonet and a broadcast. By combining three-dimensional oblique photography and BIM, an integrated basic three-dimensional scene with wide coverage and high granularity from a whole line to a road section lane and from a main facility to single equipment is constructed.
The presentation of the BIM model comprises two parts, namely the loading of the first BIM model and the rendering of the second BIM model, wherein the two parts consume system resources relatively, and high hardware resource configuration is required to meet the requirement of real-time performance. In the highway roaming scene, the viewpoint has regular movement, so the condition of parallel processing is considered, and the requirement of hardware resources is reduced.
Disclosure of Invention
To the above technical problem, the technical scheme adopted by the application is as follows:
the application provides a BIM and GIS-based preloading system, which comprises a rendering server and a storage server which are in communication connection, wherein the rendering server comprises one or more processors and a storage medium which stores a computer program; wherein, the rendering server stores GIS information and BIM index = (BIM)1，BIM2，…BIMi，…，BIMM) Wherein M is the number of BIM indexes, and the value range of iThe circumference is 1 to M; the storage server stores M BIM models associated with M BIM indexes; BIMiIncluding BIDi、BminiAnd Bmaxi。Bmini=（min(Xi)，min(Yi)，min(Zi)），Bmaxi=（max(Xi)，max(Yi)，max(Zi) Wherein, X)i，Yi，ZiCoordinates of all points included by the BIM model i along the directions of an X axis, a Y axis and a Z axis respectively;
when executed by a processor, the computer program performs the steps of:
s100, acquiring K preloaded viewpoint positions VP = (VP) at preset N moments of roaming highway1，VP2，…， VPK）；
S200, for any pre-loaded viewpoint position VPjGo through the BIM index, if index BIMiBmin (b)iAnd BmaxiAre all located in VPjIn the corresponding view cone, then BIMiCorresponding BIDiAdding to VPjBIM model index List IDXjWherein j takes the value from 1 to K;
s300, when the viewpoint roams to VPj-1Then, and IDXjWhen the corresponding BIM model does not exist in the cache of the rendering server, loading IDX from the storage serverjThe corresponding BIM model is cached in a rendering server;
s400, when the viewpoint roams to the VPjWhile, rendering IDXjCorresponding BIM model in (1).
The application has at least the following technical effects: considering that the viewpoint has regular movement in a highway roaming scene, the index of the BIM model is preloaded at the preloaded viewpoint position, and when the viewpoint roams to the current preloaded viewpoint position, the BIM model corresponding to the next preloaded viewpoint position is loaded in advance, so that when the viewpoint roams to the next preloaded viewpoint position, the number of BIM models loaded in real time is small, the loading rate can be improved, and the hardware resource requirement is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a viewpoint position on a center line of a highway according to an embodiment of the present application.
Fig. 2 is a schematic view of a viewing cone with a viewing point position located on an edge of a highway and a corresponding viewing point position according to an embodiment of the present disclosure.
FIG. 3 is a schematic view of a viewpoint position located at a center line of a highway but with a view length greater than that of the viewpoint according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a preload line in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a BIM and GIS based preloading system, which comprises a rendering server and a storage server which are in communication connection, wherein the rendering server comprises one or more processors and a storage medium which stores a computer program.
Further, the rendering server stores therein GIS information and BIM index = (BIM)1，BIM2，…BIMi，…，BIMM) Wherein, M is the number of BIM indexes, and the value range of i is 1 to M.
Furthermore, M BIM models associated with M BIM indexes are stored in the storage server, and any BIM model i comprises a unique identification BIDiAnd BIM model data i.
Further, BIMiIncluding BIDi、BminiAnd Bmaxi。Bmini=（min(Xi)，min(Yi)，min(Zi)），Bmaxi=（max(Xi)，max(Yi)，max(Zi)). Wherein, Xi，Yi，ZiThe coordinates of all points comprised by the BIM model i in the three-dimensional coordinate system, e.g. the world coordinate system, along the X-axis, Y-axis and Z-axis directions, respectively.
Further, when executed by a processor, the computer program performs the steps of:
step S100, acquiring K preloaded viewpoint positions VP = (VP) at preset N times of roaming highway1，VP2，…， VPK). Wherein, the roaming highway is generated according to GIS information.
The N preset times may be preset settings, for example, user-defined settings. In the embodiment of the present application, the viewpoint position refers to a viewpoint position of a roaming subject on a roaming highway, for example, where both eyes are located. The moving direction of the viewpoint on the expressway, the speed v and the time interval Δ t are relatively determined. On the expressway, under normal conditions, the speed and the direction do not change suddenly, so that the K preloaded viewpoint positions can be determined based on preset reference initial viewpoint positions and preset constraint conditions. In the embodiment of the present application, the preloaded viewpoint position is a position for preloading a BIM model. The manner in which the preloaded viewpoint locations of the present application are determined is described below with reference to preferred embodiments.
(example 1)
The projection of the K preloaded viewpoint positions is located on the center line of the highway, as shown in fig. 1. When the initial preloaded viewpoint position is given, the coordinates of the projection position of the initial preloaded viewpoint position on the center line of the expressway are (x 0, y0, z 0), the coordinates of the next preloaded viewpoint position at the projection position of the center line can be obtained according to the viewpoint moving speed v and the time interval Δ t (x 0+ v Δ t sina, y0, z 0), and the coordinates of the corresponding preloaded viewpoint position can be obtained (x 0+ v Δ t sina, y0, z0+ h), and h is the height of the viewpoint from the high-speed height. In this embodiment, K = N, and a is an angle between the preloaded viewpoint projection position and a tangent line to the center line and the Y-axis.
In this embodiment, the viewing cones of the preloaded viewpoint positions are shown in dotted line portions in fig. 1. The cone angle of the viewing cone is a viewing angle θ and a viewing length L0 of the viewing point, and the viewing angle θ and the viewing length L0 are actual measurement values of the viewing point.
(example 2)
The projections of the K preloaded viewpoint positions are located on the edges of both sides of the highway, as shown in fig. 2, in this embodiment K =2N, i.e. two preloaded viewpoint positions per time instant. Similar to the previous embodiment, the preloaded viewpoint positions on each edge may get the next preloaded viewpoint position projected position on the centerline based on the preset initial preloaded viewpoint positions, the viewpoint moving speed v, and the time interval Δ t, thereby getting the actual position of each preloaded viewpoint position.
In this embodiment, the viewing pyramid for each preloaded viewpoint position is shown in phantom in fig. 2. The cone angles of the viewing cones are a viewing angle θ and a viewing length L0 of the viewpoint.
(example 3)
The projection of the K preloaded viewpoint positions is located on the center line of the highway, and the view length L of each preloaded viewpoint position is larger than the view length L0 of the viewpoint, as shown in fig. 3.
In this embodiment, the viewing pyramid for each preloaded viewpoint position is shown in phantom in fig. 3, and the cone angle of the viewing pyramid is the viewing angle θ and the viewing length L = L0+ L1 of the viewpoint. As shown in fig. 3, L1= ctg (θ/2) × W/2, W being the width of the highway.
Similar to the previous embodiment, in this embodiment, the next preloaded viewpoint position in the centerline projection position may be obtained based on the preset initial preloaded viewpoint position, the viewpoint moving speed v, and the time interval Δ t, thereby obtaining the actual position of each preloaded viewpoint position.
Step S200, for any pre-loadViewpoint position VPjGo through the BIM index, if index BIMiBmin (b)iAnd BmaxiAre all located in VPjIn the corresponding view cone, then BIMiCorresponding BIDiAdding to VPjBIM model index List IDXjWherein j is from 1 to K.
After determining all the preloaded viewpoint positions according to S100, a corresponding BIM model index list IDX may be set for each preloaded viewpoint position in the rendering server, and an initial value of the BIM model index list for each preloaded viewpoint position is an empty set. Those skilled in the art will appreciate that any determination method of determining that a point is within a viewing cone in the prior art is within the scope of the present invention.
When the preloaded viewpoint position adopts the method of embodiment 1, through step S200, the BIM model can be preloaded in the corresponding view frustum, so that most of the BIM models can be seen when the real viewpoint is located on the left side or the right side of the preloaded viewpoint position in the roaming process, and only a small amount of the BIM models need to be loaded in real time, which can reduce the hardware requirement compared with the existing full real-time loading method.
When the mode of embodiment 2 is adopted for preloading viewpoint positions, compared with embodiment 1, the two view cones are provided, so that the view cone range is larger, more BIM models can be preloaded, the real-time loading capacity is lower, and the hardware requirement can be further reduced.
When the mode of embodiment 3 is adopted for preloading viewpoint positions, compared with embodiment 1, the view cone range is larger, more BIM models can be preloaded, the real-time loading capacity is lower, and the hardware requirement can be further reduced. Compared with embodiment 2, only one preloaded viewpoint position needs to be calculated, and the amount of calculation can be reduced.
S300, when the viewpoint roams to VPj-1Then, and IDXjWhen the corresponding BIM model does not exist in the cache of the rendering server, loading IDX from the storage serverjTo the cache of the rendering server.
In the present embodiment, it can be known that when j =1, the viewpoint is at the initial viewpoint position.In the embodiment of the present application, during the real roaming process, the viewpoint does not move exactly according to the preloaded viewpoint position, and therefore, roaming of the viewpoint to a certain preloaded viewpoint position does not mean that the real viewpoint position is exactly located at the preloaded viewpoint position, but means that the viewpoint crosses or is located on a preloaded line corresponding to the preloaded viewpoint position. In this step, the viewpoint roams to VPj-1Temporal means that the view crosses or is located at a preloaded view position VPj-1A corresponding preload line.
When the projection of the preloaded viewpoint position is located on the center line of the expressway, the preloaded line is a vertical line of the projected position point of the preloaded viewpoint position and a tangent line of the center line of the expressway, and intersection points of the vertical line and both sides of the expressway are a and B as shown in fig. 4. As shown in fig. 4, the real viewpoint position may be considered to roam to the preloaded viewpoint position as long as it crosses or lies on the straight line AB.
When the projections of the preloaded viewpoint positions are located on the side lines on both sides of the highway, the preloaded line is a connecting line CD between the projection position points of the left and right preloaded viewpoint positions, as shown in fig. 4, as long as the real viewpoint position crosses the straight line CD or is located on the straight line CD, it can be considered that the real viewpoint position roams to the preloaded viewpoint position.
Those skilled in the art will appreciate that the determination of whether the true viewpoint position crosses or lies on the preloaded line may be made according to existing methods.
Step S400, when the viewpoint roams to VPjWhile, rendering IDXjCorresponding BIM model in (1). Those skilled in the art will appreciate that any rendering method known in the art may be used to render the IDXjCorresponding BIM model in (1).
In the embodiment of the present application, VP is performed through steps S100-S300jThe prediction has extremely high accuracy (obviously, the prediction is time-parallel, and the prediction is wrong and is wasted), so that the loading and rendering processes can be approximately parallel by a prefetching mode, and the hardware requirement is reduced under the condition of the same performance.
Further, step S200 further includes:
step S210, from VP1Begin traversing VP if VPjCorresponding BIM model | = Null, go S220; if VPjCorresponding BIM model = Null, proceeding from VPj+1Starts to traverse until VPK。
Specifically, when traversing any pre-loading viewpoint position, the processor sends the coordinates of the current pre-loading viewpoint position to the storage server, the storage server determines whether the position can see the BIM model and how many BIM models can be seen based on the received coordinate information, and if so, sends the seen BIM model to the processor.
Step S220, if IDXj kIn IDXj+1Inner, then IDX is setj kCorresponding BIM model retention flag Rj kTo "reserve", otherwise, set IDXj kCorresponding BIM model retention flag Rj kIs "not reserved". Wherein, IDXj kIs IDXjThe k-th BIM index, k ranges from 1 to S, and S is IDXjNumber of indices in. In an exemplary embodiment of the present application, "reserved" may be represented by an identification value 1, and "unreserved" may be represented by an identification value 0, but is not limited thereto, and may be set according to actual needs, for example, reserved "may be represented by an identification value 0, and" unreserved "may be represented by an identification value 1.
Further, in this embodiment of the application, after S400, the method further includes:
step S500, when the viewpoint roams to VPj+1When R is equal toj kTo "not reserve", IDX is addedj kReleasing the corresponding BIM model in a cache in a rendering server; if R isj kTo "reserve", IDXj kAnd the corresponding BIM model continues to be rendered. In the scene of highway roaming, the BIM models are usually loaded sequentially along the direction of viewpoint movement and do not reciprocate, and the embodiment of the present application adopts the manners of S200 and S500, that is, when the viewpoint is roaming, if the viewpoint position is currently preloaded and the viewpoint position is next preloadedThe BIM models to be loaded at the viewpoint positions have the same parts, the same BIM models in the current preloaded viewpoint positions are reserved, when the real viewpoint roams to the next preloaded viewpoint position, different BIM models are released in the cache, and the same BIM models are loaded and rendered in the cache, so that the higher preloading accuracy can be achieved by using the smaller cache space of the rendering server.
Although some specific embodiments of the present application have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the present application. It will also be appreciated by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.
Claims (7)
1. A BIM and GIS based preloading system comprising a rendering server and a storage server communicatively coupled, the rendering server comprising one or more processors and a storage medium storing computer programs; wherein, the rendering server stores GIS information and BIM index = (BIM)1，BIM2，…，BIMi，…，BIMM) Wherein M is the number of BIM indexes, and the value range of i is 1 to M; the storage server stores M BIM models associated with M BIM indexes; BIMiIncluding BIMiUnique identification BID ofi、BminiAnd Bmaxi；Bmini=（min(Xi)，min(Yi)，min(Zi)），Bmaxi=（max(Xi)，max(Yi)，max(Zi) Wherein, X)i，Yi，ZiCoordinates of all points included by the BIM model i along the directions of an X axis, a Y axis and a Z axis respectively;
when executed by a processor, the computer program performs the steps of:
s100, acquiring K preloaded viewpoint positions VP = (VP) at preset N moments of roaming highway1，VP2，…， VPK）；
S200, for any pre-loaded viewpoint position VPjGo through the BIM index, if index BIMiBmin (b)iAnd BmaxiAre all located in VPjIn the corresponding view cone, then BIMiCorresponding BIDiAdding to VPjBIM model index List IDXjWherein j takes the value from 1 to K;
s300, when the viewpoint roams to VPj-1Then, and IDXjWhen the corresponding BIM model does not exist in the cache of the rendering server, loading IDX from the storage serverjThe corresponding BIM model is cached in a rendering server;
s400, when the viewpoint roams to the VPjWhile, rendering IDXjCorresponding BIM model in (1).
2. The system of claim 1, wherein the projections of the K preloaded viewpoint locations are located on a centerline of a highway.
3. The system of claim 1, wherein the projections of the K preloaded viewpoint locations are located on the edges of the two sides of the highway.
4. The system of claim 1, wherein the projections of the K preloaded viewpoint locations are located on a centerline of the highway, the view angle of each preloaded viewpoint location is equal to the view angle of the viewpoint, and the view length of each preloaded viewpoint location is greater than the view length of the viewpoint.
5. The system of claim 4, wherein the length of field of view for each preloaded viewpoint location, L = L0+ ctg (θ/2) × W/2, θ being the viewpoint field of view angle and W being the width of the highway.
6. The system of claim 1, wherein step S200 further comprises:
s210, fromVP1Begin traversing VP if VPjCorresponding BIM model | = Null, go S220; if VPjCorresponding BIM model = Null, proceeding from VPj+1Starts to traverse until VPK；
S220, if IDXj kIn IDXj+1Inner, then IDX is setj kCorresponding BIM model retention flag Rj kTo "reserve", otherwise, set IDXj kCorresponding BIM model retention flag Rj kIs "not reserved"; wherein, IDXj kIs IDXjThe k-th BIM index, k ranges from 1 to S, and S is IDXjNumber of indices in.
7. The system of claim 6, wherein S400 is followed by S500:
s500, when the viewpoint roams to VPj+1When R is equal toj kTo "not reserve", IDX is addedj kDirectly loading a cache of a corresponding BIM in a rendering server; if R isj kTo "reserve", IDX is addedj kThe corresponding BIM model is released in the cache of the rendering server.
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