LU501917B1 - Method for simulating forest management operations based on body movement interaction - Google Patents

Abstract

The present invention discloses a method for simulating forest management operations based on body movement interaction, and belongs to the technical field of forest management.

Description

METHOD FOR SIMULATING FOREST MANAGEMENT OPERATIONS LUS01917

BASED ON BODY MOVEMENT INTERACTION

TECHNICAL FIELD

[01] The present invention relates to a method for simulating forest management operations based on body movement interaction, and belongs to the technical field of forest management.

BACKGROUND ART

[02] Forest management is an important means of precisely improving the quality of forests. In the growth cycle of forests, reasonable forest management operations play a significant role in improving tree trunk shape and forest stock volume. However, due to the long growth cycle of the forests, it is difficult to simulate the forest management in reality, and there are hidden dangers in achieving the training of forest management operations. The simulation of forest management operations by computer can fill these gaps to a certain extent.

[03] At present, the common methods for simulating forest management provide simple interactive modes, mostly realizing walkthrough interaction via keyboards, mouses or handles, which cannot meet the interactive requirements of the method for simulating forest management operations.

SUMMARY

[04] To overcome the disadvantages in the prior art, the present invention provides a method for simulating forest management operations based on body movement interaction.

[05] A method for simulating forest management operations based on body movement interaction includes the following steps: studying and building a body movement interaction model for the simulation of forest management operations by using an infrared tracing module of CAVE2, and realizing a visual simulation of forest management operations (including lumbering, replanting and pruning) that features a strong sense of immersion and free interaction.

[06] The present invention has the advantages that a method for simulating forest management operations based on body movement interaction is studied and built by relying on CAVE2, a VR and visualization platform, with simulated scenarios featuring a strong sense of immersion and natural interaction, and the method is suitable for the visual simulation of forest management with frequent interactions and various interactive types.

[07] The VR technology based on human-computer interaction in the present invention provides a new idea for the simulation of forest management operations. In the simulation of forest management operations, it can provide not only an almost real forest environment but also vivid and intuitive interactive modes, making users immersive. Wherein, the immersive VR and visualization system CAVE2 features a strong sense of immersion, free interaction, a wide range of virtual simulation, and the ability to allow multiple persons to observe the virtual scene at the same time, showing 1 a great advantage in the field of forest management simulation. LU501917

BRIEF DESCRIPTION OF THE DRAWINGS

[08] When being considered in combination with the accompanying drawings, the present invention can be more completely and better understood by referring to the following detailed description, and many accompanying advantages can be known easily. However, the accompanying drawings illustrated herein are used to further understand the present invention and form part of the present invention. The exemplary embodiments of the present invention and the description are used to explain the present invention and do not form an improper limitation to the present invention. As shown in the following figures:

[09] FIG. lais a schematic diagram of a first forest management tool.

[10] FIG. 1b is a schematic diagram of a second forest management tool.

[11] FIG. 1cis a schematic diagram of a third forest management tool.

[12] FIG. 1d is a schematic diagram of a fourth forest management tool.

[13] FIG. 2 shows a virtual forest scene.

[14] FIG. 3 shows simulations of forest management operations.

[15] FIG. 4 is an overall technical flow chart of a method for simulating forest management operations based on body movement interaction in the present invention.

[16] The present invention is further described below in combination with the accompanying drawings and embodiments.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[17] Example 1: As shown in FIG. la, FIG. 1b, FIG. 1c, FIG. 1d, FIG. 2, FIG. 3 and

FIG. 4, a method for simulating forest management operations based on body movement interaction includes the following steps: to solve the problems that the existing visual simulation of forest management has a poor sense of immersion and poor interaction, a body movement interaction model for the simulation of forest management operations is studied and built by using an infrared tracing module of

CAVE2, and a visual simulation of forest management operations (including lumbering, replanting and pruning) that features a strong sense of immersion and free interaction is realized.

[18] As shown in FIG. 4, a method for simulating forest management operations based on body movement interaction includes two aspects of building forest management interaction scenarios and building body movement models. Forest management interaction types include UI interaction, lumbering, pruning and replanting, and virtual forest management tools include a hand model, a chain saw model, a hoe model and a tree pruner model. The forest management interaction types and the virtual forest management tools constitute the forest management interaction scenarios, and the forest management interaction scenarios and the body movement models constitute the simulation of forest management operations based on body movement interaction. The body movement models include a lumbering movement model, a pruning movement model, a replanting movement model and a Ul interactive movement model.

[19] 1. Forest management interaction scenarios include: 2

[20] (1) Forest management operation interaction types: LUS01917

[21] An interaction type table is created according to the interaction requirements of forest management operations, as shown in Table 1.

[22] Table 1 Interaction types

[23] Forest management operation interaction types: UI interaction, replanting, lumbering and pruning.

[24] (2) Virtual forest management tools include:

[25] Tool models corresponding to the forest management operations in Table 1 are created: a hand model (FIG. 1a) corresponds to a 3D UI information query, a chain saw model (FIG. 1b) corresponds to a lumbering operation, a hoe model (FIG. 1c) corresponds to a replanting operation, and a tree pruner model (FIG. 1d) corresponds to a pruning operation.

[26] 2. Body movement interaction models include:

[27] (1) Ul interaction body movement models include:

[28] A Ul interface is convenient for intuitively displaying forest information, and is an important part of interactive forest management simulation. A traditional 2D UI interface is not suitable for CAVE2, so a 3D UI interface is used to display tree information. Up, down, left and right body movements correspond to up, down, left and right movements of UI options; and body rotation corresponds to UI click.

[29] Based on the analysis, a body movement model mapping UI operations is created as follows.

[30] Body movements include:

[31] Dis represents a body movement distance in the current frame;

[32] UI Dis represents a set of body movement distances;

[33] Dir represents a body movement direction in the current frame;

[34] UI Dir represents a set of body movement directions.

[35] UL Dis+=[Dis],

[36] UL Dir+=[Dir].

[37] Constraints: Orientation Dis(UI Dis) represents movement distances of body movements in up, down, left and right directions, minDis represents a minimum distance required by movement of UI options; Rotation Angle(UI Dir) judges a rotation angle of body movements, and minAngle is a minimum rotation angle required by click of a UI button.

[38] Orientation Dis(UI Dis)>minDis,

[39] Rotation Angle(UI Dir)>minAngle.

[40] (2) A lumbering body movement model includes:

[41] Body movements include: Dis represents a body movement distance in the current frame, preDis represents a body movement distance in the previous frame,

Log FarDis represents a far set, Log NearDis represents a near set, Log AllDis 3 represents a far and near set, Dir represents a body movement direction in the current LU501917 frame, and Log Dir represents a set of body movement directions.

[42] Log FarDis+—[Dis>preDis],

[43] Log NearDis+—[Dis<preDis],

[44] Log AllDis+=[Log FarDis, Log NearDis],

[45] Log Dir+—[Dir]

[46] Constraints: Diff(Log FarDis, Log NearDis) represents a difference value of data volume between the far set and the near set, and maxDiff represents a maximum difference value of an allowable data volume; Num(Log_AllDis) represents a number of repetitions of body movements, and minNum represents a minimum number of repetitions required; Angle(Log Dir) represents an angle change between body movements and a user, and maxAngle represents a maximum allowable deviation angle of body movements.

[47] Diff(Log FarDis, Log NearDis)<<maxDiff,

[48] Num(LogAIIDis)>minNum,

[49] Angle(Log Dir)<maxAngle.

[50] (3) A pruning body movement model includes: [S1] In the forest management operations, pruning is a very important management measure, which has a great impact on tree growth and quality. The pruning is mainly achieved by a tree pruner. When a branch diameter is small, it can be cut down directly; when a branch diameter is large, cutting is required. Cutting action is similar to lumbering, without consideration of a number of cutting times. [S2] Based on the analysis, a body movement model of pruning operation is created as follows. [S3] Body movements include: Dis represents a body movement distance in the current frame, preDis represents a body movement distance in the previous frame,

Prune FarDis represents a far set, Prune NearDis represents a near set, Dir represents a body movement direction in the current frame, and Prune Dir represents a set of body movement directions.

[54] Prune FarDis+—[Dis>preDis], [S5] Prune NearDis+—[Dis<preDis],

[56] PruneDir+=[Dir]. [S7] Constraints: Diff(Prune FarDis, Prune NearDis) represents a difference value of data volume between the far set and the near set, and maxDiff represents a maximum difference value of an allowable data volume; Angle(Pruene Dir) represents a relative angle change between body movements and a user, and maxAngle represents a maximum allowable deviation angle of body movements. Branch Size represents a branch diameter; and minSize represents a minimum branch diameter required for pruning operation.

[58] Diff(Prune FarDis, Prune NearDis)<maxDiff,

[59] Angle(Prune Dir)<<maxAngle,

[60] Branch Size>minSize.

[61] (4) A replanting body movement model includes:

[62] In forest management, a certain distance is required between a replanting point 4 and surrounding trees; when a hoe tool is used for replanting, a body movement LU501917 trajectory 1s similar to a parabola in space, and a distance from the user 1s from far to close; a distance of the body in space from the ground decreases, and an angle between the body and a horizontal plane changes from positive to negative.

[63] Based on the analysis, a body movement model of replanting operation is created as follows:

[64] Body movements include: Dis represents a body movement distance in the current frame, Replant Dis represents a set of body movement distances; Dir represents a body movement direction in the current frame, and Replant Dir represents a set of body movement directions.

[65] Replant Dis+—[Dis],

[66] Replant Dir+= [Dir].

[67] Constraints: Far2Near(Replant Dis) judges whether a body movement distance user is from far to close; Vertical Dis(Replant Dis) judges whether a distance of the body from the ground continues to decrease; Pos2Neg(Replant Dir) judges whether an angle between the body and a horizontal plane changes from positive to negative;

Horizontal Angle(Replant Dir) represents a maximum variable quantity of an angle of the body in a horizontal direction, and maxAngle represents an allowable deviation angle of the body in the horizontal direction; Replant Time represents a contact time of a planting tool with the ground, and minTime represents a minimum time required for contact, Replant Point represents a distance between the movement trajectory and the surrounding trees, and minDis represents a minimum replanting distance required.

[68] Far2Near(Replant Dis),

[69] Vertical Dis(Replant Dis),

[70] Pos2Neg(Replant Dir),

[71] Horizontal Angle(Replant Dir)<<maxAngle,

[72] Replant Time>minTime,

[73] Replant Point(Repplant Dis)>minDis.

[74] Example 2:

[75] A method for simulating forest management operations based on body movement interaction includes the following steps:

[76] Step 1: Building a virtual 3D forest scene for management operations by using a

Unity3d rendering engine, as shown in FIG. 2.

[77] Step 2: Making corresponding body movements by using virtual management tools and performing a forest management operation method, as shown in FIG. 3.

[78] Step 3: Repeating the forest management operation method 18 times, and counting an execution efficiency of a body movement model built by the present invention. Statistical results are shown in Table 2.

[79] Table 2 Execution of body movement mapping forest management measures

Number of Lumbering Pruning Replanting UI interaction times required operation operation operation to complete the operation two | 2 [2 [2 | 060 | PP

Abovetwo | 1 | 3 | 0 | 0

[80] From Table 2, it can be found that a forest management operation can be basically realized through one-time body movements, an overall success rate of one-time operations reaches 86%, and each body movement model can be correctly mapped to the forest management operation method. The number of times completing management operations at one time: UI interaction (18) > replanting operation (16) > lumbering operation (15) > pruning operation (13).

[81] From the embodiments, it can be seen that using the method for simulating forest management operations based on body movement interaction, forest management operations can be effectively performed, interaction with forest simulation scene is natural, the simulation process is vivid and intuitive, and good effects are obtained.

[82] As described above, the embodiments of the present invention are described in detail, but it is obvious to those of ordinary skills in the art that there can be many variants without departing from the purpose and effects of the present invention.

Therefore, such variants should also fall within the protection scope of the present invention. 6

Claims (2)

1. WHAT IS CLAIMED IS: LUS01917

   I. A method for simulating forest management operations based on body movement interaction, including the following steps: studying and building a body movement interaction model for the simulation of forest management operations by using an infrared tracing module of CAVE2, and realizing a visual simulation of forest management operations (including lumbering, replanting and pruning) that features a strong sense of immersion and free interaction.
2. 2. The method for simulating forest management operations based on body movement interaction in claim 1, including two aspects of building forest management interaction scenarios and building body movement models; wherein forest management interaction types include UI interaction, lumbering, pruning and replanting, and virtual forest management tools include a hand model, a chain saw model, a hoe model and a tree pruner model; the forest management interaction types and the virtual forest management tools constitute the forest management interaction scenarios, and the forest management interaction scenarios and body movement models constitute the simulation of forest management operations based on body movement interaction; the body movement models include a lumbering movement model, a pruning movement model, a replanting movement model and a Ul interactive movement model. 1