CN109741429A - A kind of VR animated visualization method for unstructured fluid emulation model - Google Patents
A kind of VR animated visualization method for unstructured fluid emulation model Download PDFInfo
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Abstract
The invention discloses a kind of VR animated visualization methods for unstructured fluid emulation model, belong to and are related to a kind of fluid emulation technical field.The geometric data amount that the data model of existing fluid model is usually directed to is very big, then how to handle data and animation rendering control, it is very important, otherwise will use family and generates Caton sense and spinning sensation.VR animated visualization method of the invention includes that fluid emulation model read, multithreading model conversion, the processing of multithreading animation data, animation frame queue, multithreading animation GPU rendering, VR equipment such as show at the parallel asynchronous render process, pass through model structure conversion and the asynchronous Rendering of multithreading, reduce model geometric complexity, reduce animation render time, allow model in VR animation display smoothness without Caton, the loading velocity and VR animated visualization rendering effect that fluid emulation model can be effectively improved avoid user from generating Caton sense and spinning sensation.
Description
Technical field
The present invention relates to a kind of VR animated visualization methods for unstructured fluid emulation model, belong to and are related to one kind
Fluid emulation technical field.
Background technique
Fluid emulation model visualization is the Visualization of Scientific Computing towards Fluid Mechanics Computation (CFD), it is related to
To the expression of flow field data, transformation, drafting and operation.On the whole, fluid emulation model visualization needs to complete two aspects
Work, establish flow field scene and provide interactive tool.Fluid emulation model VR animated visualization mainly will be involved in flow field
The physical quantity (speed, temperature, pressure, density, vortex strength, stress etc.) arrived supports above-mentioned physics in such a way that animation renders
Three-Dimensional Dynamic change procedure is measured, is compared by the observation and research of model and flow field Physical Experiment result.In real work,
Fluid emulation model is usually made of one group of Unstructural Model file of multiple moment states, passes through one group of unstructured mould
Type file describes physical quantity state change process in entire flow field, VR animated show mode can the presentation of unusual clear and natural should
Process.The VR animated visualization of fluid emulation model usually requires to realize load, data processing, animation wash with watercolours to fluid simulation model
Several processes such as dye.Due to more demanding to animation refresh rate in VR scene, and what the data model of fluid model was usually directed to
Geometric data amount is very big, then how to handle data and animation rendering control it is very important, otherwise will use family production
Raw Caton sense and spinning sensation.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of quick load of fluid emulation model emulation
The method of model data and the rendering control of VR animated visualization, passes through model structure conversion and the asynchronous Rendering of multithreading, drop
Low model geometric complexity reduces animation render time, allow model the display of VR animation it is smooth without Caton for unstructured
The VR animated visualization method of fluid emulation model.
To achieve the above object, the technical solution of the present invention is as follows:
A kind of VR animated visualization method for unstructured fluid emulation model, including model conversion thread, animation
Data processing threads, animation render thread；
The model conversion thread reads simulation document first, and whether interpretation is non-structured fluid simulation model, if
It is non-structured fluid simulation model, then according to the unification of definition and general data structure expresses unstructured fluid emulation
Then unstructured fluid emulation model conversion is structured fluid simulation model by model；It is emulated if it is structured fluid
Model then continues to read simulation document；
Animation data processing thread specifically includes the following steps:
S1 reads structured fluid simulation model；
S2, to model data filtration treatment；
S3 carries out coloring treatment to filtered data；
S4, the data complete to coloring treatment carry out geometric transformation；
Animation frame queue is added in S5, the data that geometric transformation is completed；
Animation rendering thread the following steps are included:
Step 1, the frame in animation frame queue is periodically read；
Step 2, VR GPU rendering is carried out to the frame of reading；
Step 3, the frame for rendering completion is shown in VR equipment；
The model conversion thread, animation data processing thread, animation render the asynchronous progress of thread parallel.
VR animated visualization method of the invention includes that fluid emulation model read, multithreading model conversion, multithreading are dynamic
Draw data processing, animation frame queue, multithreading animation GPU rendering, VR equipment such as show at the parallel asynchronous render process, pass through model
Structure conversion and the asynchronous Rendering of multithreading, reduce model geometric complexity, reduce animation render time, make model dynamic in VR
Display smoothness is drawn without Caton, the loading velocity and VR animated visualization rendering effect of fluid emulation model can be effectively improved,
User is avoided to generate Caton sense and spinning sensation.
Compared with the traditional end PC fluid emulation model three-dimensional animation, VR equipment utilization computer simulation generate one it is three-dimensional
Virtual Space provides simulation of the user about visual perception, the change for the things in observation three-dimensional space for making user on the spot in person
Change, the habit that can only go the result of inspection process from the outside of computer system in the past will be changed, enable a person to be immersed to calculating
It is observed and is studied in the virtual environment that machine system is created.As optimization technique measure, by model read and conversion, animation
Two processes of data processing and animation rendering, which are separated into parallel processing when i.e. VR renders each refresh picture from serial process, to be made
What is used is frame inside queue as rendering objects, is rendered using separate threads so that VR rendering refresh frame per second only according to
Rely and renders thread itself in VR, and model read and conversion, animation data handle two processes and will not influence rendering thread.
As optimization technique measure, before model conversion, first have to define: unified and general data structure is expressed
Unstructured fluid emulation model and structured fluid simulation model, so that model is convenient for description, programming.
As optimization technique measure, the structured fluid simulation model is indicated using linear list structure, if by
Dry cell data is constituted；Each cell data is associated with corresponding three-dimensional coordinate and constitutes the geometric data structure of model data collection.
As optimization technique measure, unstructured fluid emulation model needs the data structure assisted to be indicated, and passes through
Structural model data structure samples the attribute data of master mould unstructured data；Unstructured fluid emulation model
It is substantially the process for removing unstructured secondary data structure during switching to structured fluid simulation model.
As optimization technique measure, the attribute data includes scalar scalar value, and the scalar value uses Quadric Spline
Sampling algorithm is calculated, the matrix expression of quadratic b-spline curve parametric equation are as follows:
Wherein, P0, P1, P2For the nearest corresponding scalar value of point of three near sampled point, pass through input sample point normalizing
The coordinate value t of change can be obtained corresponding scalar value by matrix calculating above.
Spline curve is a kind of parameter curve, it provides a kind of unification, accurate mathematic(al) representation, common parameter curve
Expression formula immobilize, but the expression formula localized variation of spline curve, it succinctly obtains song by sacrifice parameter curve
The accurate expression of line can represent the curve of Any Order with quadratic spline expression formula.Since non-uniform rational B-spline calculates
Amount is big, and calculating is cumbersome, calculates to reduce, using a kind of uniform secondary B-spline algorithm that knot vector is constant.It can subtract significantly
Few calculation amount, and very little is influenced on the precision of batten, thus can be applied in present invention calculating.
As optimization technique measure,
It is structured fluid simulation model by unstructured fluid emulation model conversion, specifically includes the following steps:
Step 1: the unstructured data collection A of reading model, is used to indicate original simulation model；
Step 2: initialisation structures data set B, the data of model are indicated after being used to convert；
Step 3: successively being traversed from two dimensions of X-direction and Y-direction to data sequence, and to the data of traversal
It is sampled using Quadric Spline sampling algorithm, generates corresponding structuring point set, and point set is added in data set B；
Step 4: structured data sets B saves as model file after conversion；
Sampled value actually conversion in, conversion front and back data consistency controlled by structural data point denseness of set
System, when sampling density height, all point sets and primary model data are almost consistent, so needing in practical operation according to mould
Type selects suitable sampling density, by Unstructural Model transformational structure model, so that the geological information of model is simpler,
Subsequent data processing and data geometry will be accelerated to render.
As optimization technique measure, is realized by multithreading and message queue and animation data is handled into thread, animation rendering
Two processes of thread are changed into parallel execution from serial execution, and two threads realize the communication of two threads by message queue；
After animation data handles the complete data of thread process, it is stored in message queue；Animation rendering thread is pressed
It getting frame and is rendered from message queue according to fixed timing, effectively controls the frame per second of animation.
Compared with prior art, the invention has the following advantages:
VR animated visualization method of the invention includes that fluid emulation model read, multithreading model conversion, multithreading are dynamic
Draw data processing, animation frame queue, multithreading animation GPU rendering, VR equipment such as show at the parallel asynchronous render process, pass through model
Structure conversion and the asynchronous Rendering of multithreading, reduce model geometric complexity, reduce animation render time, make model dynamic in VR
Display smoothness is drawn without Caton, the loading velocity and VR animated visualization rendering effect of fluid emulation model can be effectively improved,
User is avoided to generate Caton sense and spinning sensation.
Detailed description of the invention
Fig. 1 is the system construction drawing of the embodiment of the present invention；
Fig. 2 is the operation schematic diagram of the embodiment of the present invention；
Fig. 3 is that fluid emulation model data structures of the present invention indicate；
Fig. 4 is fluid emulation model attributes data structure of the present invention；
Fig. 5 is fluid emulation model of the present invention by the unstructured algorithm flow chart for being converted to structuring；
Fig. 6 is the asynchronous Rendering work flow diagram of the present invention；
Fig. 7 is the VR animation rendering of the invention for being applied to a large-scale wind driven generator simulation model wherein frame figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any substitution done on the essence and scope of the present invention being defined by the claims, repairs
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to of the invention thin
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
The present invention can also be understood completely in description.
As shown in Figs. 1-2, a kind of VR animated visualization method for unstructured fluid emulation model, including model turn
Thread-changing journey, animation data processing thread, animation render thread.
The model conversion thread reads simulation document first, and whether interpretation is non-structured fluid simulation model, if
It is non-structured fluid simulation model, then according to the unification of definition and general data structure expresses unstructured fluid emulation
Then unstructured fluid emulation model conversion is structured fluid simulation model by model；It is emulated if it is structured fluid
Model then continues to read simulation document.
Animation data processing thread specifically includes the following steps:
S1 reads structured fluid simulation model；
S2, to model data filtration treatment；
S3 carries out coloring treatment to filtered data；
S4, the data complete to coloring treatment carry out geometric transformation；
Animation frame queue is added in S5, the data that geometric transformation is completed；
Animation rendering thread the following steps are included:
Step 1, the frame in animation frame queue is periodically read；
Step 2, VR GPU rendering is carried out to the frame of reading；
Step 3, the frame for rendering completion is shown in VR equipment；
The model conversion thread, animation data processing thread, animation render the asynchronous progress of thread parallel.
VR animated visualization method of the invention includes that fluid emulation model read, multithreading model conversion, multithreading are dynamic
Draw data processing, animation frame queue, multithreading animation GPU rendering, VR equipment such as show at the parallel asynchronous render process, pass through model
Structure conversion and the asynchronous Rendering of multithreading, reduce model geometric complexity, reduce animation render time, make model dynamic in VR
Display smoothness is drawn without Caton, the loading velocity and VR animated visualization rendering effect of fluid emulation model can be effectively improved,
User is avoided to generate Caton sense and spinning sensation.
By model read and conversion, animation data handle two processes and animation rendering from serial process be separated into it is parallel from
Reason when i.e. VR renders each refresh picture, uses the frame inside queue as rendering objects, carries out wash with watercolours using separate threads
Dye, so that VR rendering refreshes frame per second and depends only on VR rendering thread itself, and model read and conversion, animation data handle two
A process will not influence rendering thread.
Before model conversion, first have to define: unified and general data structure expresses unstructured fluid emulation
Model and structured fluid simulation model.
The structured fluid simulation model is indicated using linear list structure, is made of several cell datas；Often
A cell data is associated with corresponding three-dimensional coordinate and constitutes the geometric data structure of model data collection.
Unstructured fluid emulation model and structured fluid simulation model can be used in memory data structure Fig. 3 and
Fig. 4 is illustrated.
It is indicated with linear list structure, wherein maxid is model data lumped element number, each cell data association pair
The three-dimensional coordinate answered, such as C1Three-dimensional coordinate be (x1, y1, z1) it constitutes the geometric data structure of model data collection.
Fig. 3 right part shows the difference of Unstructural Model and structural model, the unstructured number for needing to assist
It is indicated according to structure, such as L → C5-6-7-8Indicate an irregular quadrilateral, it is corresponding by unit C5, C6, C7, C8 respectively
Point be attached in sequence；T→C1-2-3-4-5-6Indicate an irregular hexahedron, respectively by unit C1, C2, C3, C4,
C5, C6 are attached in sequence.And the simulation model of structuring only needs unit that can indicate, arrangement is according to reference axis
It is arranged.
As shown in Figure 4, it is shown that the corresponding attribute data of the corresponding simulation model of non-structural unit (such as vorticity, pressure,
Displacement etc.), the corresponding relationship of scalar sum unit is shown in figure, and scalar is used to indicate a scalar value.Each unit is corresponding
The unique scalar value of itself.
Unstructured fluid emulation model needs the data structure assisted to be indicated；Unstructured fluid emulation model turns
It is substantially the process for removing unstructured secondary data structure during for structured fluid simulation model；Pass through structure
Change model data structures to sample the attribute data of master mould unstructured data.
The scalar value is calculated using Quadric Spline sampling algorithm, the matrix table of quadratic b-spline curve parametric equation
Up to formula are as follows:
Wherein, P0, P1, P2For the nearest corresponding scalar value of point of three near sampled point, pass through input sample point normalizing
The coordinate value t of change can be obtained corresponding scalar value by matrix calculating above.
Spline curve is a kind of parameter curve, it provides a kind of unification, accurate mathematic(al) representation, common parameter curve
Expression formula immobilize, but the expression formula localized variation of spline curve, it succinctly obtains song by sacrifice parameter curve
The accurate expression of line can represent the curve of Any Order with quadratic spline expression formula.Since non-uniform rational B-spline calculates
Amount is big, and calculating is cumbersome, calculates to reduce, using a kind of uniform secondary B-spline algorithm that knot vector is constant.It can subtract significantly
Few calculation amount, and very little is influenced on the precision of batten, thus can be applied in present invention calculating.
As shown in figure 5, being structured fluid simulation model by unstructured fluid emulation model conversion, specifically include following
Step:
Step 1: the unstructured data collection A of reading model, is used to indicate original simulation model；
Step 2: initialisation structures data set B, the data of model are indicated after being used to convert；
Step 3: successively being traversed from two dimensions of X-direction and Y-direction to data sequence, and to the data of traversal
It is sampled using Quadric Spline sampling algorithm, generates corresponding structuring point set, and point set is added in data set B；
Step 4: structured data sets B saves as model file after conversion.
Sampled value actually conversion in, conversion front and back data consistency controlled by structural data point denseness of set
System, when sampling density height, all point sets and primary model data are almost consistent, so needing in practical operation according to mould
Type selects suitable sampling density；By the way that by Unstructural Model transformational structure model, geological information is simpler, will accelerate
Subsequent data processing and the rendering of data geometry.
Animation data is handled into thread, animation rendering thread two as shown in fig. 6, realizing by multithreading and message queue
Process is changed into parallel execution from serial execution, and two threads realize the communication of two threads by message queue.Animation data
After handling the complete data of thread process, it is stored in message queue；Animation renders thread according to fixed timing from disappearing
It ceases getting frame in queue and is rendered, effectively control the frame per second of animation.
The wherein frame that animation renders in VR as shown in fig. 7, which show certain large-scale wind driven generator simulation models
Picture (including image seen in VR left eye and right eye), realizes VR animated visualization and stablizes frame per second (60 frames/second), entire animation streams
Freely without Caton.The embodiment is coloured and is rendered to wind-force vorticity, and user can stretch through the handle of VR equipment, wash with watercolours
The operations such as dye, displacement, pause animation, starting animation, observe the variation of vorticity and motion morphology under different perspectives, to be wind-force
Whether the design of generator practical structures rationally provides judgment basis.
Term is explained
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of VR animated visualization method for unstructured fluid emulation model, which is characterized in that including model conversion
Thread, animation data processing thread, animation render thread；
The model conversion thread reads simulation document first, and whether interpretation is non-structured fluid simulation model, if right and wrong
Structured fluid simulation model, then according to the unification of definition and general data structure expresses unstructured fluid emulation mould
Then unstructured fluid emulation model conversion is structured fluid simulation model by type；Mould is emulated if it is structured fluid
Type then continues to read simulation document；
Animation data processing thread specifically includes the following steps:
S1 reads structured fluid simulation model；
S2, to model data filtration treatment；
S3 carries out coloring treatment to filtered data；
S4, the data complete to coloring treatment carry out geometric transformation；
Animation frame queue is added in S5, the data that geometric transformation is completed；
Animation rendering thread the following steps are included:
Step 1, the frame in animation frame queue is periodically read；
Step 2, VR GPU rendering is carried out to the frame of reading；
Step 3, the frame for rendering completion is shown in VR equipment；
The model conversion thread, animation data processing thread, animation render the asynchronous progress of thread parallel.
2. a kind of VR animated visualization method for unstructured fluid emulation model as described in claim 1, feature
It is, model read and conversion, animation data is handled into two processes and animation rendering and are separated into parallel processing from serial process,
That is it when VR renders each refresh picture, uses the frame inside queue as rendering objects, is rendered using separate threads.
3. a kind of VR animated visualization method for unstructured fluid emulation model as described in claim 1, feature
Be, before model conversion, first have to define: unified and general data structure expresses unstructured fluid emulation model
With structured fluid simulation model.
4. a kind of VR animated visualization method for unstructured fluid emulation model as claimed in claim 3, feature
It is, the structured fluid simulation model is indicated using linear list structure, is made of several cell datas；Each list
The corresponding three-dimensional coordinate of metadata association constitutes the geometric data structure of model data collection.
5. a kind of VR animated visualization method for unstructured fluid emulation model as claimed in claim 4, feature
It is, unstructured fluid emulation model needs the data structure assisted to be indicated, and passes through structural model data structure pair
The attribute data of master mould unstructured data is sampled.
6. a kind of VR animated visualization method for unstructured fluid emulation model as claimed in claim 5, feature
It is, the attribute data includes scalar scalar value, and the scalar value is calculated using Quadric Spline sampling algorithm, and two
The matrix expression of secondary B-spline curves parametric equation are as follows:
Wherein, P0, P1, P2It is normalized by input sample point for the nearest corresponding scalar value of point of three near sampled point
Coordinate value t can be obtained corresponding scalar value by matrix calculating above.
7. a kind of VR animated visualization method for unstructured fluid emulation model as described in claim 1-6 is any,
It is characterized in that,
It is structured fluid simulation model by unstructured fluid emulation model conversion, specifically includes the following steps:
Step 1: the unstructured data collection A of reading model, is used to indicate original simulation model；
Step 2: initialisation structures data set B, the data of model are indicated after being used to convert；
Step 3: successively being traversed from two dimensions of X-direction and Y-direction to data sequence, and the data of traversal are used
Quadric Spline sampling algorithm is sampled, and generates corresponding structuring point set, and point set is added in data set B；
Step 4: structured data sets B saves as model file after conversion；
Sampled value actually conversion in, conversion front and back data consistency controlled by structural data point denseness of set,
When sampling density height, all point sets and primary model data are almost consistent, so needing in practical operation according to model
Suitable sampling density is selected, by Unstructural Model transformational structure model.
8. a kind of VR animated visualization method for unstructured fluid emulation model as claimed in claim 7, feature
Be, realized by multithreading and message queue animation data is handled into thread, animation renders two processes of thread from serially holding
Row is changed into parallel execution, and two threads realize the communication of two threads by message queue；
After animation data handles the complete data of thread process, it is stored in message queue；Animation renders thread according to solid
Fixed timing getting frame and is rendered from message queue.
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| CN116842715A (en) * | 2023-06-25 | 2023-10-03 | 北京华如科技股份有限公司 | Simulation data structuring processing system |
| CN116842715B (en) * | 2023-06-25 | 2024-04-26 | 北京华如科技股份有限公司 | Simulation data structuring processing system |
| CN117274527A (en) * | 2023-08-24 | 2023-12-22 | 东方电气集团科学技术研究院有限公司 | Method for constructing three-dimensional visualization model data set of generator equipment |
| CN117274527B (en) * | 2023-08-24 | 2024-06-11 | 东方电气集团科学技术研究院有限公司 | Method for constructing three-dimensional visualization model data set of generator equipment |
| CN116778046A (en) * | 2023-08-28 | 2023-09-19 | 乐元素科技(北京)股份有限公司 | Hair model processing method, device, equipment and medium based on multithreading |
| CN116778046B (en) * | 2023-08-28 | 2023-10-27 | 乐元素科技(北京)股份有限公司 | Hair model processing method, device, equipment and medium based on multithreading |
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