CN107393019B - Particle-based cloth simulation method and device - Google Patents
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Abstract
The embodiment of the invention discloses a particle-based cloth simulation method and device, which are used for determining a target LOD level from prestored LOD levels; according to a processing rule corresponding to the target LOD level, carrying out grouping processing on each vertex contained in the three-dimensional model to obtain a plurality of groups; each group can determine a physical particle, the physical particle is subjected to cloth simulation, and after coordinate values of the physical particle are determined, coordinate values corresponding to all vertexes contained in the group are calculated according to the coordinate values and the position relation between the physical particle and all vertexes contained in the corresponding group. Therefore, the system can automatically group the vertexes according to the processing rule corresponding to the selected LOD level, and the automation degree of cloth simulation is improved. And the system can select different LOD levels according to different requirements, so that the cloth simulation can be smoothly carried out on different mobile devices, and the simulation effect is improved.
Description
Technical Field
The invention relates to the technical field of physical motion simulation, in particular to a method and a device for cloth simulation based on particles.
Background
Level Of Detail algorithms (LOD), which commonly occur in game rendering, mean that models Of different degrees Of refinement are used under different environment settings. For example, a distant mountain seen in a game has very low model accuracy, but as a player approaches it, a more accurate model is gradually adopted. The LOD generally refers to the accuracy of the model, i.e., the number of triangular faces of the model, and the greater the number of faces, the higher the accuracy of the model is, and the more memory is occupied. The cloth simulation is to simulate physical motion of each vertex on a model based on the existing three-dimensional model. When a cloth material is simulated, if the model precision is high (i.e. the number of vertexes is large), a large amount of calculation (especially during collision processing) exists during simulation, and smooth operation on a mobile platform is often not achieved.
In the traditional mode, a Spring skeleton (Spring bones) mode is adopted for cloth simulation, the method associates cloth with bones by means of 3d model making software, commonly called Skin (Skin), then, during simulation, only the bones need to be subjected to cloth simulation, and peaks associated with the bones can move along with the bones, so that the calculated amount is reduced, and the efficiency of the cloth simulation operation period is improved to a certain extent.
However, this method usually involves a certain amount of art workload, usually requires a lot of time for the art personnel, and requires manual binding between the skeleton and the vertices in the model in the early stage of operation, resulting in a long time consumption in the early stage of processing. In addition, the specific effect of the method is related to the number of bones and the covering, but the number of bones is often limited, so that the simulation effect is poor.
Therefore, how to improve the automation degree of cloth simulation is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for cloth simulation based on particles, which can improve the automation degree of cloth simulation.
In order to solve the above technical problem, an embodiment of the present invention provides a method for simulating a cloth based on particles, including:
determining a target LOD level from prestored LOD levels, and performing grouping processing on each vertex contained in a three-dimensional model to be processed according to a processing rule corresponding to the target LOD level to obtain a plurality of groups;
determining a physical particle corresponding to a first group according to all vertexes contained in the first group, and performing cloth simulation on the physical particle to determine a coordinate value of the physical particle; wherein the first packet is any one of the plurality of packets;
and calculating the coordinate value corresponding to each vertex included in the first group according to the coordinate value of the physical particle and the position relation between the physical particle and each vertex included in the first group.
Optionally, the determining a target LOD level from the prestored LOD levels includes:
receiving a hierarchical instruction input by a user;
and selecting an LOD level corresponding to the level instruction from prestored LOD levels according to the level instruction, wherein the LOD level is a target LOD level.
Optionally, the determining a target LOD level from the prestored LOD levels includes:
acquiring performance data of equipment; the performance data includes a data load time;
and according to the level corresponding to the performance data, selecting an LOD level corresponding to the level from prestored LOD levels, wherein the LOD level is a target LOD level.
Optionally, the determining, according to all vertices included in the first packet, a physical particle corresponding to the first packet includes:
and determining a central position corresponding to the first group according to the position relation among all the vertexes contained in the first group, and setting a physical particle at the central position.
The embodiment of the invention also provides a particle-based cloth simulation device, which comprises a preprocessing unit, a determining unit, a simulation unit and a calculating unit,
the preprocessing unit is used for determining a target LOD level from prestored LOD levels and performing grouping processing on each vertex contained in the three-dimensional model to be processed according to a processing rule corresponding to the target LOD level to obtain a plurality of groups;
the determining unit is configured to determine a physical particle corresponding to a first packet according to all vertices included in the first packet;
the simulation unit is used for carrying out material distribution simulation on the physical particles and determining coordinate values of the physical particles; wherein the first packet is any one of the plurality of packets;
and the calculating unit is used for calculating the coordinate value corresponding to each vertex included in the first group according to the coordinate value of the physical particle and the position relationship between the physical particle and each vertex included in the first group.
Optionally, the preprocessing unit includes a receiving subunit and a selecting subunit,
the receiving subunit is used for receiving a hierarchical instruction input by a user;
and the selecting subunit is used for selecting the LOD level corresponding to the level instruction from prestored LOD levels according to the level instruction, wherein the LOD level is a target LOD level.
Optionally, the preprocessing unit includes an obtaining subunit and a selecting subunit,
the acquiring subunit is configured to acquire performance data of the device; the performance data includes a data load time;
and the selecting subunit is used for selecting the LOD level corresponding to the level from the prestored LOD levels according to the level corresponding to the performance data, wherein the LOD level is the target LOD level.
Optionally, the determining unit is specifically configured to determine a center position corresponding to the first group according to a position relationship between vertices included in the first group, and set a physical particle at the center position.
According to the technical scheme, the target LOD level is determined from the prestored LOD levels; according to a processing rule corresponding to the target LOD level, carrying out grouping processing on each vertex contained in the three-dimensional model to be processed to obtain a plurality of groups; taking one of the groups, i.e., the first group, as an example, according to all the vertices included in the first group, a physical particle corresponding to the first group can be determined. Carrying out material distribution simulation on the physical particles to determine coordinate values of the physical particles; according to the coordinate values of the physical particles and the position relationship between the physical particles and each vertex included in the first packet, the coordinate values corresponding to each vertex included in the first packet can be calculated. Therefore, the system can automatically group all vertexes contained in the three-dimensional model according to the processing rule corresponding to the selected LOD level, and the automation degree of cloth simulation can be effectively improved. And the system can select different LOD levels according to different requirements, so that the cloth simulation can be smoothly carried out on different mobile devices, and the simulation effect is improved.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a flowchart of a method for particle-based material distribution simulation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating positions of all vertices included in a first packet according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a particle-based cloth simulation apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Next, a cloth simulation method based on particles according to an embodiment of the present invention will be described in detail. Fig. 1 is a flowchart of a particle-based cloth simulation method according to an embodiment of the present invention, where the method includes:
s101: and determining a target LOD level from the prestored LOD levels, and performing grouping processing on each vertex contained in the three-dimensional model to be processed according to a processing rule corresponding to the target LOD level to obtain a plurality of groups.
The LOD level may be used to represent how fine a three-dimensional model is to be simulated for distribution. In the embodiment of the invention, different LOD levels can be preset for different precision requirements.
To facilitate the system to distinguish between different LOD levels, a corresponding number value may be set for each LOD level. For example, LOD levels may be sequentially numbered 0, 1, 2 …, N, in order of high to low precision.
The target LOD level may be used to represent one LOD level selected when grouping vertices included in the three-dimensional model.
There may be two ways to determine the target LOD level. The first way may be determined by the user, specifically, the user may input the hierarchical command through the related interface provided by the system, and the system receives the hierarchical command input by the user; and selecting an LOD level corresponding to the level instruction from prestored LOD levels according to the level instruction, wherein the LOD level is a target LOD level.
The level instruction may be information indicating a LOD level. In the above description, each LOD level has a corresponding number value, and accordingly, the level instruction may specifically be a number value. For example, the user inputs the number value "2" on a related interface provided by the system, and the system may select an LOD hierarchy corresponding to the number value "2" from the LOD hierarchies stored in advance as a target LOD hierarchy according to the number value.
The second way may be automatically determined by the system, specifically, the system may be based on the acquired performance data of the device; and according to the level corresponding to the performance data, selecting an LOD level corresponding to the level from prestored LOD levels, wherein the LOD level is a target LOD level.
The performance data may include information such as data load time. The data load time may refer to a time from when an application (app) is started to when the app main interface is entered.
The shorter the data loading time of the equipment is, the larger data size can be rapidly calculated by the equipment, and at the moment, an LOD level with higher precision can be selected as a target LOD level; correspondingly, the longer the data loading time of the device is, the longer the device may spend in calculating a larger data amount, which may result in low system processing efficiency.
In practical applications, different levels may be divided for performance data, each level corresponding to a LOD hierarchy. After the system acquires the performance data of the equipment, the level to which the equipment belongs can be judged, and a target LOD level is determined from a plurality of prestored LOD levels according to the corresponding relation between the level and the LOD level.
The corresponding precision of each LOD level is different, so that the system can automatically group the vertexes contained in the three-dimensional model, and corresponding processing rules can be set for each LOD level.
The processing rule may be a rule that groups vertices contained in the three-dimensional model. In the embodiment of the present invention, a form of grouping vertices is adopted, all vertices included in each group are represented by one physical particle, and a processing rule is also a correspondence between a vertex and a physical particle.
The higher the precision requirement is, the fewer the number of vertexes corresponding to one physical particle is; correspondingly, the lower the precision requirement, the more vertices the physical particle corresponds to.
With reference to the foregoing example, when the number value of the LOD level is 0, it indicates that the precision corresponding to the LOD level is the highest, and at this time, the processing rule may be that one vertex is a physical particle, that is, one vertex is a group.
When the number of the LOD level is 1, the processing rule may select a vertex as a first type of vertex, a vertex directly connected to the vertex as a second type of vertex, and the two types of vertices as a group.
For example, vertex 1 is selected in the three-dimensional model, and vertices directly connected to vertex 1 are vertex 2, vertex 3, and vertex 4, respectively, and vertex 1-vertex 4 may be grouped as one group.
When the number value of the LOD level is 2, the processing rule may select a vertex as a first class vertex, a vertex directly connected to the vertex as a second class vertex, and then select a vertex directly connected to the second class vertex as a third class vertex, and the three classes of vertices are taken as a group. Taking one vertex in the second class of vertices as an example, when a third class of nodes directly connected to the one vertex is selected, the remaining vertices in the first class of vertices and the remaining vertices in the second class of vertices may be excluded.
For example, vertex 1 is selected from the three-dimensional model, vertices directly connected to vertex 1 are vertices 2 to 4, vertices directly connected to vertex 2 are vertices 5 and 6, vertices directly connected to vertex 3 are vertices 7 and 8, and vertices directly connected to vertex 4 are vertices 6, 8, and 9, and vertices may be grouped together.
By analogy, a processing rule corresponding to each LOD level may be set, and details are not described herein.
It should be noted that the processing rule is only one possible processing rule in the embodiment of the present invention, and in the embodiment of the present invention, the processing rule corresponding to each LOD layer is not specifically limited. The higher the accuracy requirement is met, the fewer the number of vertexes contained in the packet, and the processing rules are all applicable to the embodiment of the invention.
In order to improve the processing efficiency of the system, the established LOD hierarchy and the corresponding processing rules thereof can be stored in the system memory in advance, so that the system can directly call the corresponding processing rules before the cloth simulation is performed, and the automatic grouping is realized.
It should be noted that the process of grouping vertices in the three-dimensional model belongs to a preprocessing process, and for the same three-dimensional model, only one grouping operation needs to be performed on the three-dimensional model according to the grouping manner. That is, when the three-dimensional model is processed subsequently, the operation of subsequent cloth simulation is executed directly according to the set grouping condition, and the grouping operation does not need to be executed repeatedly.
S102: and determining a physical particle corresponding to the first group according to all vertexes contained in the first group, and performing cloth simulation on the physical particle to determine the coordinate value of the physical particle.
Wherein the first packet is any one of the plurality of packets.
By carrying out material distribution simulation on the physical particles, material distribution processing on each vertex in the three-dimensional model is avoided, the consumption of a memory occupied by material distribution simulation and a CPU (central processing unit) can be effectively reduced, and the processing efficiency can be effectively improved.
Taking an arbitrary one of the plurality of groups, that is, a first group as an example, for determining the physical particles of the first group, specifically, a central position corresponding to the first group may be determined according to a positional relationship between vertices included in the first group, and one physical particle may be set at the central position.
For example, as shown in fig. 2, the schematic diagram of the positions of all vertices included in the first packet is shown, where the first packet includes 4 vertices, i.e., vertex 1-vertex 4, and as can be seen from fig. 2, the 4 vertices are exactly points corresponding to four corners of a square, and the central position o of the square is the central position of the 4 vertices, the physical particle may be disposed at the central position.
S103: and calculating the coordinate value corresponding to each vertex included in the first group according to the coordinate value of the physical particle and the position relation between the physical particle and each vertex included in the first group.
Taking the first grouping as an example, when determining the physical particle, the position relationship between the physical particle and each vertex in the first grouping can be determined accordingly.
In S102, the coordinate values of the physical particle may be determined, and then the coordinate values of each vertex may be calculated according to the position relationship between the physical particle and each vertex in the first group.
By referring to the determination mode of the coordinate values of all the vertexes in the first group, the coordinate values of all the vertexes in all the groups in the three-dimensional model can be determined, so that the determination of the coordinate values of all the vertexes in the three-dimensional model is completed, namely, the cloth simulation process of the vertexes in the three-dimensional model is completed.
According to the technical scheme, the target LOD level is determined from the prestored LOD levels; according to a processing rule corresponding to the target LOD level, carrying out grouping processing on each vertex contained in the three-dimensional model to be processed to obtain a plurality of groups; taking one of the groups, i.e., the first group, as an example, according to all the vertices included in the first group, a physical particle corresponding to the first group can be determined. Carrying out material distribution simulation on the physical particles to determine coordinate values of the physical particles; according to the coordinate values of the physical particles and the position relationship between the physical particles and each vertex included in the first packet, the coordinate values corresponding to each vertex included in the first packet can be calculated. Therefore, the system can automatically group all vertexes contained in the three-dimensional model according to the processing rule corresponding to the selected LOD level, and the automation degree of cloth simulation can be effectively improved. And the system can select different LOD levels according to different requirements, so that the cloth simulation can be smoothly carried out on different mobile devices, and the simulation effect is improved.
Fig. 3 is a schematic structural diagram of a particle-based cloth simulation apparatus according to an embodiment of the present invention, the apparatus includes a preprocessing unit 31, a determining unit 32, a simulation unit 33, and a calculating unit 34,
the preprocessing unit 31 is configured to determine a target LOD level from prestored LOD levels, and perform grouping processing on vertices included in the three-dimensional model to be processed according to a processing rule corresponding to the target LOD level to obtain a plurality of groups;
the determining unit 32 is configured to determine a physical particle corresponding to a first packet according to all vertices included in the first packet;
the simulation unit 33 is configured to perform a material distribution simulation on the physical particles, and determine coordinate values of the physical particles; wherein the first packet is any one of the plurality of packets;
the calculating unit 34 is configured to calculate, according to the coordinate values of the physical particles and the position relationship between the physical particles and each vertex included in the first packet, coordinate values corresponding to each vertex included in the first packet.
Optionally, the preprocessing unit includes a receiving subunit and a selecting subunit,
the receiving subunit is used for receiving a hierarchical instruction input by a user;
and the selecting subunit is used for selecting the LOD level corresponding to the level instruction from prestored LOD levels according to the level instruction, wherein the LOD level is a target LOD level.
Optionally, the preprocessing unit includes an obtaining subunit and a selecting subunit,
the acquiring subunit is configured to acquire performance data of the device; the performance data includes a data load time;
and the selecting subunit is used for selecting the LOD level corresponding to the level from the prestored LOD levels according to the level corresponding to the performance data, wherein the LOD level is the target LOD level.
Optionally, the determining unit is specifically configured to determine a center position corresponding to the first group according to a position relationship between vertices included in the first group, and set a physical particle at the center position.
The description of the features in the embodiment corresponding to fig. 3 may refer to the related description of the embodiment corresponding to fig. 1, and is not repeated here.
According to the technical scheme, the target LOD level is determined from the prestored LOD levels; according to a processing rule corresponding to the target LOD level, carrying out grouping processing on each vertex contained in the three-dimensional model to be processed to obtain a plurality of groups; taking one of the groups, i.e., the first group, as an example, according to all the vertices included in the first group, a physical particle corresponding to the first group can be determined. Carrying out material distribution simulation on the physical particles to determine coordinate values of the physical particles; according to the coordinate values of the physical particles and the position relationship between the physical particles and each vertex included in the first packet, the coordinate values corresponding to each vertex included in the first packet can be calculated. Therefore, the system can automatically group all vertexes contained in the three-dimensional model according to the processing rule corresponding to the selected LOD level, and the automation degree of cloth simulation can be effectively improved. And the system can select different LOD levels according to different requirements, so that the cloth simulation can be smoothly carried out on different mobile devices, and the simulation effect is improved.
The method and the device for simulating the cloth based on the particles provided by the embodiment of the invention are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Claims (6)
1. A cloth simulation method based on particles is characterized by comprising the following steps:
determining a target LOD level from prestored LOD levels, and performing grouping processing on each vertex contained in a three-dimensional model to be processed according to a processing rule corresponding to the target LOD level to obtain a plurality of groups;
determining a physical particle corresponding to a first group according to all vertexes contained in the first group, and performing cloth simulation on the physical particle to determine a coordinate value of the physical particle; wherein the first packet is any one of the plurality of packets;
calculating coordinate values corresponding to the vertexes contained in the first group according to the coordinate values of the physical particles and the position relations between the physical particles and the vertexes contained in the first group;
the determining a physical particle corresponding to the first packet according to all vertices included in the first packet includes:
and determining a central position corresponding to the first group according to the position relation among all the vertexes contained in the first group, and setting a physical particle at the central position.
2. The method of claim 1, wherein determining a target LOD level from the pre-stored LOD levels comprises:
receiving a hierarchical instruction input by a user;
and selecting an LOD level corresponding to the level instruction from prestored LOD levels according to the level instruction, wherein the LOD level is a target LOD level.
3. The method of claim 1, wherein determining a target LOD level from the pre-stored LOD levels comprises:
acquiring performance data of equipment; the performance data includes a data load time;
and according to the level corresponding to the performance data, selecting an LOD level corresponding to the level from prestored LOD levels, wherein the LOD level is a target LOD level.
4. A particle-based cloth simulation device is characterized by comprising a preprocessing unit, a determining unit, a simulation unit and a calculating unit,
the preprocessing unit is used for determining a target LOD level from prestored LOD levels and performing grouping processing on each vertex contained in the three-dimensional model to be processed according to a processing rule corresponding to the target LOD level to obtain a plurality of groups;
the determining unit is configured to determine a physical particle corresponding to a first packet according to all vertices included in the first packet;
the simulation unit is used for carrying out material distribution simulation on the physical particles and determining coordinate values of the physical particles; wherein the first packet is any one of the plurality of packets;
the calculation unit is configured to calculate, according to the coordinate values of the physical particles and the position relationships between the physical particles and the vertices included in the first packet, the coordinate values corresponding to the vertices included in the first packet;
the determining unit is specifically configured to determine a center position corresponding to the first group according to a position relationship between vertices included in the first group, and set a physical particle at the center position.
5. The apparatus of claim 4, wherein the pre-processing unit comprises a receiving subunit and a selecting subunit,
the receiving subunit is used for receiving a hierarchical instruction input by a user;
and the selecting subunit is used for selecting the LOD level corresponding to the level instruction from prestored LOD levels according to the level instruction, wherein the LOD level is a target LOD level.
6. The apparatus of claim 4, wherein the pre-processing unit comprises an acquisition subunit and a selection subunit,
the acquiring subunit is configured to acquire performance data of the device; the performance data includes a data load time;
and the selecting subunit is used for selecting the LOD level corresponding to the level from the prestored LOD levels according to the level corresponding to the performance data, wherein the LOD level is the target LOD level.
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| CN102982580A (en) * | 2012-11-09 | 2013-03-20 | 沈阳创达技术交易市场有限公司 | Levels of detail (LOD) arithmetic aiming at large-scale landforms |
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| US8243064B1 (en) * | 2007-11-15 | 2012-08-14 | Nvidia Corporation | System for providing scalable physics content |
| US8000947B1 (en) * | 2008-05-22 | 2011-08-16 | Electronic Arts Inc. | Particle-based cloth simulation using verlet integration with fixed and stiff-spring constraints supporting collision detection and reaction with projectiles in sports video games |
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