CN106780681A - A kind of role action generation method and device - Google Patents

Abstract

The invention discloses a kind of role action generation method and device.The role action generation method includes：The key frame attitude information of role action is obtained, the key frame attitude information is used to describe the framework characteristic of the role action；The key frame attitude information is generated by skeleton cartoon file according to preset algorithm, the skeleton cartoon file is used to perform the deliberate action of game role.Role action is immobilized, cannot meet player to personalized role image demand during the present invention solves the problems, such as game, new skeleton cartoon file is generated by the key frame attitude information of the role action that will be got, effectively prevent the single dull of game role, realization moulds distinguished role image according to the hobby of user, and then the role image that designing user is liked, so as to improve the interest of game, Consumer's Experience is improved.

Description

A kind of role action generation method and device

Technical field

The present embodiments relate to development of games technical field, more particularly to a kind of role action generation method and device.

Background technology

In the large-scale online network game development processes of 3D, in order to increase the interesting of game, sociability, can be set to character Put abundant expression and action.For example, in shooting game, it is fixed dynamic that role generally has the default race jump shooting of game etc. Make；In Role Playing Game, role can further preset more fight athletic movements.Traditional role's edit mode, all It is to enter edlin by the editing machine of the animation teacher specialty of specialty to generate.In recent years, also having many game can set people by player The expression details of thing, for example《Sword spirit》It is towards player, pinch face system for face shape,《Keep watch pioneer》Can also be from choosing Select setting role's facial expressions and acts in list.As player increases to virtual world controllability demand, the angle of object game player Color motion editing system design turns into a technical matters.

For the setting of role action, basic technical scheme is that some complete animation files are deposited in game package. In game running, broadcasting facial expressions and acts can be voluntarily set by player, or according to the default technical ability of technical ability button operation triggering Action.This scheme is very ripe, has applied in the middle of most of 3D network games.For example《World of Warcraft》.

The everything of role is all changeless, and the figure action of each operation triggering is showed for different players Same role all, it is impossible to meet the personalized demand of role action in the game virtual world.

The content of the invention

The present invention provides a kind of role action generation method and device, is immobilized with role action in solving game, nothing Method meets problem of the player to personalized role image demand.

In a first aspect, a kind of role action generation method is the embodiment of the invention provides, including：

The key frame attitude information of role action is obtained, the key frame attitude information is used to describe the role action Framework characteristic；

The key frame attitude information is generated by skeleton cartoon file according to preset algorithm, the skeleton cartoon file is used for Perform the deliberate action of game role.

Second aspect, the embodiment of the present invention additionally provides a kind of role action generating means, including：.

Key frame attitude information acquisition module, the key frame attitude information for obtaining role action, the key frame appearance State information is used to describe the framework characteristic of the role action；

Skeleton cartoon file generating module, for the key frame attitude information to be generated into skeleton cartoon according to preset algorithm File, the skeleton cartoon file is used to perform the deliberate action of game role.

The embodiment of the present invention, new skeleton cartoon text is generated by the key frame attitude information of the role action that will be got Part, role action immobilizes in solving game, it is impossible to meet problem of the player to the demand of personalized role image, effectively The single dull of game role is avoided, realizes moulding distinguished role image according to the hobby of user, and then generate The role image that user likes, so as to improve the interest of game, improves Consumer's Experience.

Brief description of the drawings

Fig. 1 is a kind of role action generation method schematic flow sheet in the embodiment of the present invention one.

Fig. 2 is skeleton cartoon file generated operating process in a kind of role action generation method in the embodiment of the present invention two Schematic diagram.

Fig. 3 is a kind of framework characteristic structural representation in the embodiment of the present invention two.

Fig. 4 is the distribution schematic diagram of a kind of two-dimentional key point in the embodiment of the present invention two in simple picture is acted.

Fig. 5 is a kind of role action generating means structural representation in the embodiment of the present invention three.

Specific embodiment

The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, in order to just Part rather than entire infrastructure related to the present invention is illustrate only in description, accompanying drawing.

Embodiment one

Fig. 1 is a kind of role action generation method schematic flow sheet that the embodiment of the present invention one is provided, and the present embodiment can be fitted Situation is automatically generated for game role, the method can be performed by a kind of role action generating means, the device can be by The mode of software and/or hardware is realized.As shown in figure 1, the method includes：

S110, the key frame attitude information for obtaining role action, the key frame attitude information are used to describe the role The framework characteristic of action.

Role action can be the action of game role execution in game, and in the present embodiment, the role action is game The personalized role action that player sets according to oneself demand.The key frame attitude information is that game player is input into terminal The information corresponding with the personalized role action that oneself sets.The key frame attitude information can be image information, It can also be the adjust instruction being adjusted to existing role action in game.

When the key frame attitude information is image information, the action message that terminal can be in described image extracts phase The framework characteristic answered, and corresponding role action is generated according to the framework characteristic.When key frame attitude information is in game During the adjust instruction that existing role action is adjusted, terminal can be according to the adjust instruction to the framework characteristic of role action It is adjusted and obtains new framework characteristic.

S120, the key frame attitude information is generated by skeleton cartoon file, skeleton cartoon text according to preset algorithm Part is used to perform the deliberate action of game role.

Skeleton cartoon file is obtained according to preset algorithm by terminal to the key frame attitude information treatment for getting.

Further, a skeleton cartoon file can correspond at least two key frame attitude informations.

When the role action of player's setting is simpler, skeleton cartoon file can be processed by two key frame attitude informations Obtain, respectively start attitude information and terminate attitude information, start appearance when attitude information represents that role action starts to perform State, terminates attitude when attitude information role action terminates to perform.When the role action of player's setting is more complicated, skeleton cartoon File attitude information, an end attitude information and at least one middle attitude information processing by one are obtained.Role moves The complexity of work is higher, and the number of middle attitude information is more.

The technical scheme of the present embodiment, new bone is generated by the key frame attitude information of the role action that will be got Animation file, role action immobilizes in solving game, it is impossible to meet player's asking to the demand of personalized role image Topic, effectively prevent the single dull of game role, and realization is moulded distinguished role image, entered according to the hobby of user And the role image that user likes is generated, so as to improve the interest of game, improve Consumer's Experience.

Embodiment two

Fig. 2 is skeleton cartoon file generated operating process in a kind of role action generation method in the embodiment of the present invention two Schematic diagram.The present embodiment proposes a kind of role action generation method on the basis of embodiment one, further describes key frame Attitude information generates the specific steps of skeleton cartoon file.As shown in Fig. 2 being specially：

S210, the extraction key frame action from default skeleton cartoon file, motion characteristic number is converted into by key frame action According to and be stored in motion characteristic storehouse, the motion characteristic storehouse include motion characteristic data, motion file name and action frame number.

Default skeleton cartoon file is the original skeleton cartoon file of game, and the key frame action is being held for game role The corresponding information that row is extracted when comparing the action of definition from default skeleton cartoon file, the action of definition can be Run, jump, shooting, kicking, wave, roll and bend over wait act.

Key frame action is converted into motion characteristic data, the process is the process for simplifying feature, specifically, extracting crucial Crucial joint point in frame action, it is determined that the position of crucial joint point and state, and it is built into the letter of similar skeleton character structure Breath.

Framework characteristic structure is two dimensional character skeleton, represents the major joint position in game role and joint states.Bone Joint point in frame feature structure is more, and the exercise attitudes performance to game role is more detailed, and the role action of generation is more true to nature, Now by key frame attitude information to the generating process of skeleton cartoon file it is more complicated, it is necessary to time it is more long, to terminal processes The requirement of device is also higher.When the movement node in framework characteristic structure is fewer, the motion appearance of the game role for showing Gesture is simpler, and the role action of generation is simpler, therefore in the framework characteristic structure in the selection of bone number of nodes, it should root The aspects such as the accuracy according to game performance and generation role action consider.

In the present embodiment, framework characteristic structure is preferably made up of 17 joint points.During Fig. 3 is the embodiment of the present invention two A kind of framework characteristic structural representation., as shown in figure 3, framework characteristic structure (KeyFrame) includes 16 limbs nodes and 1 Head node, and represented in the way of vector, i.e., framework characteristic structure is by 15 limbs unit vectors and 1 head knot vector structure Into KeyFrame can be expressed as:{(e₀,e₁,e₂),...,(e₁₂,e₁₃,e₁₄), head }, wherein e₀-e₁₄Represent limbs unit Vector, head represents head node vector, it is necessary to illustrate, in influence of the practice procedure heading knot vector to role action Very little, can ignore.

Preferably, the framework characteristic structure includes at least 15 limbs unit vectors.

The motion characteristic data can be framework characteristic vector set corresponding with key frame action.

Further, it is described that key frame action is extracted from default skeleton cartoon file, key frame action is converted into dynamic Make characteristic and be stored in motion characteristic storehouse, including：

The action of at least one key frame is extracted from default skeleton cartoon file based on extreme attitude algorithm.

Whether the extreme attitude algorithm is used to judge current character action in extreme attitude, specifically, when game angle When the crucial bone node motion or rotary acceleration of color body are close to 0 value, then judge that current character action is extreme attitude, and Key frame action is extracted from the action of current current character.

Can there are multiple extreme attitudes in a default skeleton cartoon file, therefore can be from a skeleton cartoon file In extract the action of multiple key frames.

Multiple critical movements nodes are extracted for the action of each key frame, according to the framework characteristic structure to described many Individual critical movements node normalized obtains motion characteristic data.

Critical movements node represents the main joint point of key frame action, such as neck joint point, ancon joint point, waist Joint point and knee cap node etc..Multiple critical movements nodes are normalized according to skeleton character structure are moved Characteristic.It is that can carry out computing and data with comparativity that normalized is used for critical movements node processing.

To the motion characteristic data, key frame motion file name and described with the key frame corresponding action action frame of action Sequence number sets up corresponding relation, and stores in motion characteristic storehouse.

After key frame action is converted into motion characteristic data, obtains key frame and act in default skeleton cartoon file Detailed frame number obtains acting frame number, is that the action key frame data name obtains motion file name, by the motion characteristic Data, action frame number and motion file name are set up corresponding relation and are stored in motion feature storehouse.

S220, the key frame attitude information for obtaining role action, the key frame attitude information are used to describe the role The framework characteristic of action.

S230, the framework characteristic structure for obtaining the key frame attitude information, the key frame attitude information include action Simple picture.

Action simple picture is the simple shape of role action that game player describes according to self-demand, it is also possible to also role Lower certain a part of simple shape of action, the benefit for so setting is simple input information, is easy to player to be input into, user experience By force.

The action simple picture can be sent by user by the hand drawing board being connected with terminal, it is also possible to by the void of terminal Intend drawing board or touch-screen sends.

S240, a, two-dimentional key point is extracted from action simple picture, and simple picture feature is obtained according to the two-dimentional key point Data.

The two-dimentional key point is used to determine skeleton character structure.At least two 2 are can extract in each action simple picture Position key point, starts key point and terminates key point.

During action simple picture is obtained, user can be pointed out to carry out five input operations, and then get five letters Stroke, represents the trunk of game role, left arm, right arm, left limb, right limb respectively successively.

Preferably, four two-dimentional key points are extracted from action simple picture in the present embodiment.During Fig. 4 is the embodiment of the present invention two A kind of two-dimentional key point act simple picture in distribution schematic diagram.As shown in figure 4, four two-dimentional key points are respectively P₀、 P_maxdis、P_maxdis' and P_N, P₀Expression acts the beginning key point of simple picture, P_NExpression acts the end key point of simple picture, P_maxdisRange line section P in expression action simple picture₀P_NFarthest point, P_maxdis' expression action simple picture P₀P_maxdisCurve middle-range Offline section P₀P_maxdisFarthest point.3 characteristic vectors can be got according to aforementioned four two dimension key point.

Five action simple pictures are extracted and obtains 20 two-dimentional key points, 15 characteristic vectors, i.e., 15 limbs vectors, root Simple picture characteristic is obtained according to 15 limbs vectors.

S250, b, calculating simple picture characteristic and the characteristic distance in the motion characteristic storehouse between motion characteristic data, Selected characteristic distance value closest to 0 value motion characteristic data as optimal characteristics data, and according in motion characteristic storehouse with most The corresponding move file name of excellent characteristic and motion frame number obtain three-dimensional bone attitude frame data.

The three-dimensional bone attitude frame data are the characteristic most matched with motion characteristic data in motion characteristic storehouse.

Further, the computing formula of the characteristic distance includes：

Dis represents characteristic distance, P_sketchRepresent simple picture characteristic；

P_keyframeMotion characteristic data are represented, n represents the quantity of characteristic node in framework characteristic structure；

e_{sketch_i}Represent ith feature node data in simple picture characteristic；

e_{keyframe_i}Represent ith feature node data in motion characteristic data；

w_iRepresent weighted value of the ith feature node data in simple picture characteristic.

S260, repetition a steps and b step, obtain three-dimensional bone attitude frame data set.

The set of three-dimensional bone attitude frame data is made up of at least one three-dimensional bone attitude frame data.

The complexity of the personalized role action needed according to game player, repeats a steps and b step, obtains multiple Simple picture characteristic, the complexity of role action is higher, and a steps and b step number of repetition are more.

S270, the execution moment according to default three-dimensional bone attitude frame data in the skeleton cartoon file and execution Order carries out interpolation arithmetic to three-dimensional bone attitude frame data, and obtains skeleton cartoon file.

Exemplary, three-dimensional bone attitude frame data collection is combined into { KeyFrame₀,KeyFrame₁,...,KeyFrame_N, Motion moment collection corresponding with three-dimensional bone attitude frame data set is combined into { KeyTime₀,KeyTime₁,...,KeyTime_N, it is right Each bone attitude Bone of each moment motion frame KeyFrame enters row interpolation, obtains the exercise data at each moment {Frame₀,Frame₁,...,Frame_N, and then obtain skeleton cartoon file.

The technical scheme of the present embodiment, the concrete structure of simple picture and skeleton character structure is acted by setting so that Matching operation of the input operation, simple picture characteristic of game player in motion characteristic storehouse is simpler, quick, efficient, Difference operation is carried out by three-dimensional bone attitude frame data, the more plentiful and true to nature role action of expression effect is obtained, it is raw Into the role action most proper with game player's demand, and then distinguished role image is moulded, so as to improve game Interest, improves Consumer's Experience.

Embodiment three

Fig. 3 show a kind of role action generating means structural representation of the offer of the embodiment of the present invention three, such as Fig. 3 institutes Show, the game level processing unit includes：Key frame attitude information acquisition module 310 and skeleton cartoon file generating module 320.

Wherein, key frame attitude information acquisition module 310, the key frame attitude information for obtaining role action is described Key frame attitude information is used to describe the framework characteristic of the role action.

Skeleton cartoon file generating module 320, for the key frame attitude information to be generated into bone according to preset algorithm Animation file, the skeleton cartoon file is used to perform the deliberate action of game role.

Further, role action generating means also include：

Motion characteristic storehouse acquisition module, it is dynamic from default bone for before the key frame attitude information for obtaining role action Extraction key frame action in file is drawn, key frame action is converted into motion characteristic data and is stored in motion characteristic storehouse, it is described Motion characteristic storehouse includes motion characteristic data, motion file name and action frame number.

Further, the skeleton cartoon file generating module includes：

Framework characteristic structure acquiring unit, the framework characteristic structure for obtaining the key frame attitude information, the pass Key frame attitude information includes action simple picture；

Simple picture characteristic acquiring unit, for extracting two-dimentional key point from action simple picture, and according to the two dimension Key point obtains simple picture characteristic；

Three-dimensional bone attitude frame data acquiring unit, it is dynamic with the motion characteristic storehouse for calculating simple picture characteristic Make the characteristic distance between characteristic, selected characteristic distance value closest to 0 value motion characteristic data as optimal characteristics data, And three-dimensional bone attitude is obtained according to move file name corresponding with optimal characteristics data and motion frame number in motion characteristic storehouse Frame data；

Attitude frame data set acquiring unit, described in being turned on and off according to the acquisition number of times of the action simple picture Simple picture characteristic acquiring unit and three-dimensional bone attitude frame data acquiring unit, obtain three-dimensional bone attitude frame data collection Close；

Interpolation arithmetic execution unit, for according to default three-dimensional bone attitude frame data in the skeleton cartoon file The execution moment and execution sequence interpolation arithmetic is carried out to three-dimensional bone attitude frame data, and obtain skeleton cartoon file.

Further, motion characteristic storehouse acquisition module includes：

Key frame acts extraction unit, for extracting at least one from original bone animation file based on extreme attitude algorithm Individual key frame action；

Normalized unit, for extracting multiple critical movements nodes for the action of each key frame, according to described Framework characteristic structure obtains motion characteristic data to the multiple critical movements node normalized；

Corresponding relation sets up unit, for the position to the motion characteristic data, key frame action message storage Corresponding relation is set up with the action frame number corresponding with key frame action, and is stored in motion characteristic storehouse.Further, The computing formula of the characteristic distance includes：

Dis represents characteristic distance, P_sketchRepresent simple picture characteristic；

P_keyframeMotion characteristic data are represented, n represents the quantity of characteristic node in framework characteristic structure；

e_{sketch_i}Represent ith feature node data in simple picture characteristic；

e_{keyframe_i}Represent ith feature node data in motion characteristic data；

w_iRepresent weighted value of the ith feature node data in simple picture characteristic.

Further, the framework characteristic structure includes at least 15 limbs unit vectors.

The technical scheme of the present embodiment, generates new bone and moves by the key frame attitude information of the role action for getting Draw file.Role action immobilizes in solving game, it is impossible to meet problem of the player to the demand of personalized role image. The single dull of game role is effectively prevent, realization moulds distinguished role image according to the hobby of user, and then The role image that generation user likes, so as to improve the interest of game, improves Consumer's Experience.

The role action generating means that the embodiment of the present invention is provided can be used for performing what the embodiment of the present invention was provided Role action generation method, possesses corresponding function and beneficial effect.Not ins and outs of detailed description in the present embodiment, can Referring to the role action generation method that any embodiment of the present invention is provided.

Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes, Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.

Claims (12)

1. a kind of role action generation method, it is characterised in that including：

The key frame attitude information of role action is obtained, the key frame attitude information is used to describe the skeleton of the role action Feature；

The key frame attitude information is generated by skeleton cartoon file according to preset algorithm, the skeleton cartoon file is used to perform The deliberate action of game role.

2. role action generation method according to claim 1, it is characterised in that obtain the key frame attitude of role action Before information, also include：

Key frame action is extracted from default skeleton cartoon file, key frame action is converted into motion characteristic data and is stored in dynamic Make in feature database, the motion characteristic storehouse includes motion characteristic data, motion file name and action frame number.

3. role action generation method according to claim 2, it is characterised in that it is described according to preset algorithm by the pass Key frame attitude information generates skeleton cartoon file, including：

The framework characteristic structure of the key frame attitude information is obtained, the key frame attitude information includes action simple picture；

A, two-dimentional key point is extracted from action simple picture, and simple picture characteristic is obtained according to the two-dimentional key point；

B, calculate the characteristic distance between motion characteristic data in simple picture characteristic and the motion characteristic storehouse, selected characteristic away from From value closest to 0 value motion characteristic data as optimal characteristics data, and according in motion characteristic storehouse with optimal characteristics data Corresponding move file name and motion frame number obtain three-dimensional bone attitude frame data；

A steps and b step are repeated, three-dimensional bone attitude frame data set is obtained；

The execution moment and execution sequence according to default three-dimensional bone attitude frame data in the skeleton cartoon file is to three Dimension bone attitude frame data carry out interpolation arithmetic, and obtain skeleton cartoon file.

4. role action generation method according to claim 2, it is characterised in that described from default skeleton cartoon file Key frame action is extracted, key frame action is converted into motion characteristic data and is stored in motion characteristic storehouse, including：

The action of at least one key frame is extracted from default skeleton cartoon file based on extreme attitude algorithm；

Multiple critical movements nodes are extracted for the action of each key frame, according to the framework characteristic structure to the multiple pass Key motion node normalized obtains motion characteristic data；

To the motion characteristic data, the key frame action message filename and described with the key frame corresponding action action frame of action Sequence number sets up corresponding relation, and stores in motion characteristic storehouse.

5. role action generation method according to claim 3, it is characterised in that

The computing formula of the characteristic distance includes：

$Dis=\mathrm{\Δ}(P_{skectch},P_{keyframe})=\underset{i=0}{\overset{n}{\Σ}}{w}_i(1-e_{sketch\_i}{e}_{keyframe\_i}),$

Dis represents characteristic distance, P_sketchRepresent simple picture characteristic；

P_keyframeMotion characteristic data are represented, n represents the quantity of characteristic node in framework characteristic structure；

e_{sketch_i}Represent ith feature node data in simple picture characteristic；

e_{keyframe_i}Represent ith feature node data in motion characteristic data；

w_iRepresent weighted value of the ith feature node data in simple picture characteristic.

6. role action generation method according to claim 2, it is characterised in that

The framework characteristic structure includes at least 15 limbs unit vectors.

7. a kind of role action generating means, it is characterised in that including：

Key frame attitude information acquisition module, the key frame attitude information for obtaining role action, the key frame attitude letter Cease the framework characteristic for describing the role action；

Skeleton cartoon file generating module, for according to preset algorithm that key frame attitude information generation skeleton cartoon is literary Part, the skeleton cartoon file is used to perform the deliberate action of game role.

8. role action generating means according to claim 7, it is characterised in that also include：

Motion characteristic storehouse acquisition module, for before the key frame attitude information for obtaining role action, from default skeleton cartoon text Key frame action is extracted in part, key frame action is converted into motion characteristic data and is stored in motion characteristic storehouse, the action Feature database includes motion characteristic data, motion file name and action frame number.

9. role action generating means according to claim 7, it is characterised in that the skeleton cartoon file generating module Including：

Framework characteristic structure acquiring unit, the framework characteristic structure for obtaining the key frame attitude information, the key frame Attitude information includes action simple picture；

Simple picture characteristic acquiring unit, it is for extracting two-dimentional key point from action simple picture and crucial according to the two dimension Point obtains simple picture characteristic；

Three-dimensional bone attitude frame data acquiring unit, it is special with action in the motion characteristic storehouse for calculating simple picture characteristic The characteristic distance between data is levied, selected characteristic distance value is closest to the 0 motion characteristic data being worth as optimal characteristics data, and root Three-dimensional bone attitude frame number is obtained according to motion file name corresponding with optimal characteristics data and action frame number in motion characteristic storehouse According to；

Attitude frame data set acquiring unit, for being turned on and off the simple pen according to the acquisition number of times of the action simple picture Characteristic acquiring unit and three-dimensional bone attitude frame data acquiring unit are drawn, three-dimensional bone attitude frame data set is obtained；

Interpolation arithmetic execution unit, for according to default three-dimensional bone attitude frame data holding in the skeleton cartoon file Row moment and execution sequence carry out interpolation arithmetic to three-dimensional bone attitude frame data, and obtain skeleton cartoon file.

10. role action generating means according to claim 8, it is characterised in that motion characteristic storehouse acquisition module includes：

Key frame acts extraction unit, for extracting at least one pass from default skeleton cartoon file based on extreme attitude algorithm Key frame is acted；

Normalized unit, for extracting multiple critical movements nodes for the action of each key frame, according to the skeleton Feature structure obtains motion characteristic data to the multiple critical movements node normalized；

Corresponding relation sets up unit, for the motion characteristic data, the key frame action message filename and it is described with The corresponding action frame number of key frame action sets up corresponding relation, and stores in motion characteristic storehouse.

11. role action generating means according to claim 9, it is characterised in that

The computing formula of the characteristic distance includes：

$Dis=\mathrm{\Δ}(P_{skectch},P_{keyframe})=\underset{i=0}{\overset{n}{\Σ}}{w}_i(1-e_{sketch\_i}{e}_{keyframe\_i}),$

Dis represents characteristic distance, P_sketchRepresent simple picture characteristic；

P_keyframeMotion characteristic data are represented, n represents the quantity of characteristic node in framework characteristic structure；

e_{sketch_i}Represent ith feature node data in simple picture characteristic；

e_{keyframe_i}Represent ith feature node data in motion characteristic data；

w_iRepresent weighted value of the ith feature node data in simple picture characteristic.

12. role action generating means according to claim 9, it is characterised in that

The framework characteristic structure includes at least 15 limbs unit vectors.