CN106228592A - A kind of method of clothing threedimensional model automatic Bind Skin information - Google Patents

A kind of method of clothing threedimensional model automatic Bind Skin information Download PDF

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CN106228592A
CN106228592A CN201610815603.6A CN201610815603A CN106228592A CN 106228592 A CN106228592 A CN 106228592A CN 201610815603 A CN201610815603 A CN 201610815603A CN 106228592 A CN106228592 A CN 106228592A
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clothing
eyelid covering
threedimensional model
model
weighted value
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沃胤晟
童晶
冉传鄂
陈涛
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Wuhan Cat Technology Co Ltd
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Wuhan Cat Technology Co Ltd
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    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T13/00—Animation
    • G06T13/20—3D [Three Dimensional] animation
    • G06T13/40—3D [Three Dimensional] animation of characters, e.g. humans, animals or virtual beings
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
    • G06T17/30—Polynomial surface description
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
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    • G06T2207/30196—Human being; Person

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Abstract

The invention discloses a kind of clothing threedimensional model automatic Bind Skin method, automatically revise including dress form breakthrough point eyelid covering weighted value in dress form eyelid covering weight assignment, skeleton cartoon.The inventive method first gives eyelid covering weight initial value to dress form；Between human body skin model and dress form, calculate eyelid covering feature similarity point, then the weighted value on similar for skin model summit is assigned to garment form, complete weight assignment operation.After garment form eyelid covering weight composes initial value, dynamic corrections need to be carried out, to eliminate the summit penetration phenomenon between dress form and human body skin model by grid vertex eyelid covering weighted value inaccurate to model；This process is in the way of multiple skeleton posture iteration, dress form breakthrough point is calculated under a certain skeleton posture, and breakthrough point weighted value is revised in real time, breakthrough point is done real-time correcting process by skeleton iterated transform to other posture and with same manner again, complete weighted value and automatically revise operation.

Description

A kind of method of clothing threedimensional model automatic Bind Skin information
Technical field
The present invention relates to three-dimensional simulation technique field, particularly relate to a kind of human body three-dimensional fitting emulation field clothing three-dimensional The method of model automatic Bind Skin information.
Background technology
In human body three-dimensional fitting emulation field, skeleton is associated with role's grid, in order to skeleton makes distortion of the mesh, grid energy Change with the position motion change of skeleton.This process is referred to as eyelid covering.
In human body three-dimensional fitting emulation field, generally it is adopted as human body skin and human body is worn the clothes and bound Skeletal Skinned letter Breath, so that human body skin grid model and clothes grid model can change with the position motion change of skeleton.
In existing human body three-dimensional fitting emulation project, developer processes software by using the threedimensional model of specialty The manual eyelid covering function of (such as 3ds max, maya etc.) carries out manual type to human body skin grid model and clothing grid model Bind Skin information.
The eyelid covering data that the method for this artificial Bind Skin obtains are the finest.But, data-handling efficiency pole It is low.The most thousand of summits of one clothing grid model, several ten thousand at most.To the point on dress form in the way of artificial The most time-consuming effort again of Bind Skin information.And, the human body skin after eyelid covering is bound and the clothing three being through on human body Dimension module, after skeleton posture changes, there will be summit penetration problem between human body skin and clothing threedimensional model.
Existing automatic eyelid covering binding algorithm, can only solve the eyelid covering binding of single grid model, but can not solve many Layer nested grid model eyelid covering penetration problem between model in skeleton motion.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of clothing threedimensional model automatic Bind Skin letter The method of breath.Present invention seek to address that the problem that manually clothing threedimensional model is carried out the most time-consuming effort again of eyelid covering binding And the mesh point penetration problem that multilayer nest grid model is between skeleton motion animation model.
The technical solution adopted in the present invention is: a kind of clothing threedimensional model automatic Bind Skin method, comprises following step Rapid:
(1) clothing threedimensional model eyelid covering weight assignment；
(2) during skeleton motion, clothing threedimensional model penetrates summit eyelid covering weighted value and automatically revises.
Wherein, clothing threedimensional model eyelid covering weight composes initial value, it is characterised in that including:
Human body skin model and auto-partition, clothing three-dimensional model gridding summit.The present invention uses the human body skin with zone attribute Skin template model and clothing three-dimensional template model carry out grid vertex auto-partition to anthropometric dummy and clothing threedimensional model.This point Human body skin model and clothing threedimensional model are respectively divided into five regions by district's method: left arm region, right arm region, Zuo Tui district Territory, right lower limb region, backbone area；If inadequate five subregions of dress form, the most only isolate separable region.
Subregion process comprises the steps of:
Step 101, reads human body Partition Mask data and clothing Partition Mask data.
Human body Partition Mask model is made up of five multiblock technique, according to the multiblock technique separated by human body Partition Mask mould Five districts are assigned on all summits on type grid
MB = {MB0,MB1,MB2,MB3,MB4}
MB0: left arm subregion；MB1: right arm subregion；MB2: trunk subregion；MB3: left lower limb subregion MB4: right lower limb subregion；Each subregion In MBi, storage belongs to all summits of current bay
MBi = {MBi0,MBi1,MBi2,...,MBij}
Jth summit in MBij:MBi subregion.
In like manner, five districts are assigned on all summits in clothing Partition Mask model meshes
MC = {MC1,MC2,MC3,MC4,MC5}
MC1: left arm subregion；MC2: right arm subregion；MC3: trunk subregion；MC4: left lower limb subregion MC5: right lower limb subregion
In each subregion MCi, storage belongs to all summits of current bay
MCi = {MCi0,MCi1,MCi2,...,MCij}
MCij: MCiJth summit in subregion
Step 102, standardized human body's skin model and treat eyelid covering clothing threedimensional model subregion.
Standardized human body's skin model zoning ordinance is as follows:
Read the most all summits in standardized human body's skin model, composition set SV
SV = {SV1, SV2, SV3..., SVn}
N-th summit in SVn: SV vertex set.Traversal SV vertex set, takes out summit SVn from SV gathers, passes through summit SVnThe same place MB with SVn is found in MB partitioned setij, same place is calculated by formula (1) (2) (3) and judges, simultaneously full Foot formula (1) (2) (3) then, SVnWith MBijFor same place
SVn.x == MBij.x formula (1)
SVn.y == MBij.y formula (2)
SVn.z == MBij.z formula (3)
By formula (1) (2) (3) method all summits in human body Partition Mask model meshes are assigned to five districts:
SB = {SB0,SB1,SB2,SB3,SB4}
SB0: left arm subregion；SB1: right arm subregion；SB2: trunk subregion；SB3: left lower limb subregion SB4: right lower limb subregion.Each subregion In SBi, storage belongs to all summits of current bay:
SBi = {SBi0,SBi1,SBi2,...,SBij}
SBij: SBiJth summit in subregion.
In like manner, eyelid covering dress form data partition is treated.
Treat eyelid covering dress form data all vertex sets SC
CV= {CV1, CV2, CV3..., CVn}
CVn: the n-th summit in CV vertex set.Traversal CV vertex set, takes out summit CV from CV gathersn, pass through summit CVnIn MC partitioned set, find the same place MCij with CVn, meet formula (4) (5) (6) then, SVnWith MCijFor same place,
CVn.x == MCij.x formula (4)
CVn.y==MCij.y formula (5)
CVn.z==MCij.z formula (6)
By formula (4) (5) (6) method, five districts are assigned on all summits in human body Partition Mask model meshes
SC= {SC0,SC1,SC2,SC3,SC4}
SC0: left arm subregion；SC1: right arm subregion；SC2: trunk subregion；SC3: left lower limb subregion SC4: right lower limb subregion；Each subregion In SCi, storage belongs to all summits of current bay
SCi = {SCi0,SCi1,SCi2,...,SCij}
SCij: SCiJth summit in subregion.
Step 103, human body skin model and clothing threedimensional model calculate with site: treat on the dress form of eyelid covering each point Summit, district SCmi, travels through all summit SBmj in SBm, calculates the Euclidean distance DSmj of each summit SCmj Yu SCmi, obtains Distance set DSm；
DSm= {DSm0,DSm1,DSm2,...,DSmj}
Set DSm finds apart from short value DSmin:
DSmn == DSmin = min{DSm}
Then SBmn is exactly the same site of SCmi.
Step 104, with site eyelid covering weight assignment: by clothing three-dimensional model gridding summit on human body skin grid model The eyelid covering weighted value in same site be assigned to self.
The eyelid covering weighted value mentioned in the present invention, is the corresponding skeleton list that receives impact of each summit on grid, And the weighted value that each skeleton is corresponding.It is defined as follows:
BW = <B={B1,B2,...,Bn},W={W1,W2,...,Wn}>
The skeleton node of Bn: association；The eyelid covering weighted value of Wn: skeleton Bn
According to the same site SBmn of calculated SCmi, by the eyelid covering weighted value BW of SBmn pointSB(m n) is assigned to SCmi's Eyelid covering weight BWSC(m, i):
BWSC(m, i)=BWSB(m,n)
Step 105, clothing three-dimensional model gridding summit subregion seam is smooth to be sewed up:
Owing to clothes grid model to be carried out the mode of the subregion assignment that eyelid covering weight assignment uses constantly in aforementioned process, because of This, there is larger difference in the eyelid covering weighted value between two adjacent subregions, causes the vertex movements shape of subregion seam crossing State difference is excessive there is grid sawtooth.The present invention uses the mode of the neighbor smoothing clothing to passing through after step 8 eyelid covering Threedimensional model does smooth operation and eliminates seam crossing grid sawtooth.
R is that eyelid covering smooths the vertex search radius of neighbourhood；For the summit SC on clothing threedimensional modelij, search with field radius R Rope SCijNeighborhood point.Calculate SCmnPoint and SCijDistance Dis(SC between pointij, SCmn):
Dis(SCij, SCmn)=
If Dis(SCij, SCmn)≤R, then judge that the skeleton motion characteristic of SCmn with SCij is the most consistent, it is judged that standard: If the bone portion Bmn={ B of BWmn1,B2... } and BWijBone portion Bij = {B1,B2... } and unordered equal, then SCmnWith SCijSkeleton motion characteristic consistent, then SCmnIt is SCijSkeleton motion neighborhood point, be designated as NBt, by SCmnJoin SCijNeighborhood point set NBij；
NBij = {NB0, NB1,NB2..., NBt}
To NBijAll neighborhood points calculating smoothing weights in set:
Wij ={,,...,}
Wij: SCijWeighted value after smoothing processing；W (n): the weighted value of the n-th position in neighborhood point NBt weighted value list.
For, during skeleton motion, clothing threedimensional model penetrates summit eyelid covering weighted value and automatically revises, it is characterised in that Including:
Step 201, clothing threedimensional model calculates based on human body skin model breakthrough point:
Conversion skeleton posture, calculates the dress form grid breakthrough point relative to human body skin model.At dynamic eyelid covering weighted value At the beginning of amendment, according to the skeleton cartoon requirement in actual items, set the feature posture of skeleton:
KP = {KP0,KP1,KP2,....,KPn}
KP: need the crucial skeleton posture set of iterative processing.From KP in iterative process0Posture starts to KPnIt is considered as one Secondary skeleton posture iteration.
At KPi(i 0,1,2 ..., and n}) summits all on dress form are worn with human body skin model under posture Thoroughly judge.It is the intersection point calculating space ray with planar delta that breakthrough point calculates core methed.If ray is not parallel with plane, Intersection point will be there is.As shown in Figure 8, it is known that ray L crosses a m(m1, m2, m3), and direction vector is VL(v1, v2, v3), triangular facet △ ABC plane P crosses a n(n1, n2, n3), and normal direction vector is VP(vp1, vp2, vp3), try to achieve the friendship of straight line and plane Point O coordinate (x, y, z).Linear equation is write as parametric equation form, is i.e. had:
x = m1 + v1 * t
y = m2 + v2 * t (1)
z = m3 + v3 * t
Plane equation is write as a normal equation form, is i.e. had:
vp1 * (x - n1) + vp2 * (y - n2) + vp3 * (z - n3) = 0 (2)
Then straight line necessarily meets formula (1) and (2), simultaneous two formula with the intersection point of plane, tries to achieve:
t = ((n1 – m1)*vp1+(n2 – m2)*vp2+(n3 – m3)*vp3) / (vp1* v1+ vp2* v2+ vp3* v3) (3)
If (3) in formula, denominator (vp1* v1+vp2*v2+vp3*v3) is 0, then it represents that straight line is parallel with plane, i.e. straight line is with flat Face does not has intersection point.After solving t, then t is substituted into formula (1) can try to achieve intersection point O coordinate (x, y, z).
(x, y, z) with parametric equation t parameter with plane point of intersection O can be calculated ray according to above-mentioned formula.If O point Inside triangular facet △ ABC, and t >=0, then penetrate between m point and triangular facet △ ABC.Thus it is calculated under KPi posture All breakthrough point set TPi。
TPi = {P0, P1, P2...., Pn}
Owing to human body is at each posture lower trunk, arm, lower limb, between there is blocking of each subregion, so when calculating breakthrough point still So calculate according to the breakthrough point between five corresponding subregions between subregion and dress form of anthropometric dummy, can not be across subregion meter Calculate breakthrough point.
Step 202, clothing threedimensional model breakthrough point eyelid covering weighted value dynamically revises: to calculating gained grid in step 201 Breakthrough point revises its weighted value dynamically.
For breakthrough point SCij, eyelid covering weighted value Wij = {W0,W1,...,Wn}；WijEyelid covering weighted value have three features:
①0 <= Wn <= 1
②0 <= <= 1
③Wmax = max{W0, W1..., WnCorresponding weight and corresponding skeleton be to SCijMoving displacement impact maximum.
Based on above-mentioned characteristic, when the weighted value of breakthrough point is made an amendment, according to characteristic 3. for WmaxModify, so The most 2. W is adjusted afterwards according to characteristicijIn other Wn(non-Wmax).To WmaxAmendment divide three steps:
1. to WmaxMake increase amendment to attempt:
Wmax + = Wmax + CorrectValue
CorrectValue: weighted value to be modified increase and decrease amplitude；Must assure that Wmax ≤ 1, if the W after modified calculatingmax More than 1, then WmaxIt is entered as 1；WijIn other Wn(non-Wmax) weighted value amendment:
Wn= Wn - CorrectValue * Wn/ (1 - Wmax)
Must assure that Wn >=0, if Wn is less than 0 after modified calculating, then Wn is entered as 0；
The most again to amended WijIt is normalized:
Wn + = (1 - Wmax + ) * Wn +/
Amended skeleton weighted value is Wij +
Wij += {Wmax +,W0 +,W1 +..., Wn-1 + }
After skeleton weight modification, SCijThe point position of point, by real-time change, has new some position SCij
SCij SCij
Calculate first some position and the penetration range DS penetrating triangular facet △ ABCPenetrate +, SC after a position changesij +No longer penetrate, Then
DSPenetrate += 0
SC after changing such as fruit dot positionij +Still penetrate, then
DSPenetrate +=Euclidean distance (SCij +, △ ABC)
2. to WmaxMake minimizing amendment to attempt:
Wmax -= Wmax - CorrectValue
Must assure that Wmax>=0, if the W after modified calculatingmaxLess than 0, then WmaxIt is entered as 0；WijIn other Wn(non- Wmax) weighted value amendment:
Wn -= Wn - CorrectValue * Wn/ (1 - Wmax)
Must assure that Wn>=0, if W after modified calculatingnLess than 0, then WnIt is entered as 0；
The most again to amended WijIt is normalized:
Wn -= (1 - Wmax -) * Wn - / - (I ≠ max)
Amended skeleton weighted value is Wij —
Wij = {Wmax -, W0 -, W1 -..., Wn-1 -}
After skeleton weight modification, the some position of SCij point, by real-time change, has new some position SCij _
SCij SCij -
Calculate first some position and the penetration range DS penetrating triangular facet △ ABCPenetrate +, SCij after a position changes-No longer wear Thoroughly, then
DSPenetrate -= 0
SC after changing such as fruit dot positionij +Still penetrate, then
DSPenetrate -=Euclidean distance (SCij -, △ ABC)
3. attempting amendment result according to the most 2. breakthrough point selects this breakthrough point to revise genuine policy, determines this amendment of SCij True weighted value Wij；
If DSPenetrate + < DSPenetrate -, then Wij=Wij +, otherwise Wij= Wij -。
Step 203, the iteration that under bone site pattern conversion, eyelid covering is revised automatically:
It is iteratively repeated 2,3 until meeting convergence constraints: under current posture, after eyelid covering binding amendment, breakthrough point number is 0；Then Under KPi posture, eyelid covering weight iterative modifications completes；
Step 205, by skeleton stance adjustment to posture KPi = KPi+1(being adjusted to next posture), repeats 201,202,203, 204 steps, until i==n posture completes, then complete the eyelid covering weight iterative modifications of the most all postures；
Step 206, after completing step 5, travels through all postures in a KP posture set, and each posture is carried out step Breakthrough point in 2 calculates, and obtains the breakthrough point set TPS of dress form under all postures,
TPS = {TP0, TP1, TP2..., TPn}
Calculate different total numbers TP of breakthrough point in TPS setNum；
Step 207, it is judged that whether iteration eyelid covering has retrained, TPNumShresholdIt is breakthrough point number threshold value, if TPNum <= TPNumShreshold, iteration eyelid covering completes, and otherwise, repeats step 201 and arrives step 206, until meeting iteration to complete constraints, complete Whole iteration eyelid covering is become to revise process.
Compared with prior art, the invention has the beneficial effects as follows:
1, change the artificial Bind Skin mode of clothing threedimensional model into computer automatic Bind Skin mode, decrease and produce into This, improve production efficiency；
2, the clothing threedimensional model of eyelid covering will have been bound when converting skeleton posture, real-time computation model breakthrough point, and Breakthrough point is carried out real-time breakthrough point weighted value dynamic corrections, to ensure correct in skeleton cartoon of dress form weighted value Property.
Accompanying drawing explanation
Fig. 1 is human skeleton model figure,
Fig. 2 is human body standard skin illustraton of model,
Fig. 3 is clothing three-dimensional model diagram,
Fig. 4 is human body skin Partition Mask illustraton of model,
Fig. 5 is clothing Partition Mask figures,
Fig. 6 is human body Partition Mask partitioned nodes figure,
Fig. 7 is that in clothing threedimensional model skeleton cartoon, grid penetrates figure,
Fig. 8 is space line and plane seeks friendship schematic diagram.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and be easy to understand with effect, enter below One step illustrates the present invention.
The automatic skinning method of clothing threedimensional model of the present invention mainly includes two parts: Part I is at the static shape of skeleton Under state, clothing three-dimensional grid model is carried out the eyelid covering binding on summit；Part II is to clothing after skeleton dynamically changes posture The breakthrough point covered by human body skin grid on three-dimensional grid model carries out the dynamic amendment of Skeletal Skinned weighted value.
Part I: resting state eyelid covering is bound
Step 301, human body kimonos decking data creating
FBX is this set form of being used of software of FilmBoX, after rename as Motionbuilder.Because Motionbuilder plays the part of Drill is the platform that makes of action, so the rendering of modeling in front end and rear end depends on other software Cooperation, purposes maximum for fbx is used in such as carrying out between the softwares such as max, maya, softimage model, material, action With the mutual conductance of camera information, the advantage of the softwares such as max and maya thus can be played.The threedimensional model number that the present invention uses According to being all based on fbx form.
Human body three-dimensional emulation data are divided into three parts: human skeleton model (fbx) data (shown in Fig. 1)；Human body skin three Dimension grid model (fbx) data (shown in Fig. 2), carries out artificial eyelid covering binding to this human body model data；Clothing three-dimensional grid Model (fbx) data (shown in Fig. 3).
3DS MAX is used to carry out grid division, producer the anthropometric dummy shown in Fig. 2 and the dress form shown in Fig. 3 Body Partition Mask data, zoning ordinance, human body is divided into five regions: left arm, right arm, left lower limb, right lower limb, main torso portion, people As shown in Figure 4, garment form subregion is as shown in Figure 5 for body Model subregion.
Step 302, reads human body Partition Mask data.
Human body skin Partition Mask model will be got out import in 3DS MAX Same Scene.
Import to the human body Partition Mask model in scene and be in effect divided into the grid model of five parts, at 3ds Showing as five grids (Mesh) node (as shown in Figure 6) in max, Mesh nodename is respectively as follows: " BLM_ " (left arm subregion), " BRM_ " (right arm subregion), " BMM_ " (trunk subregion), " BLG_ " (left lower limb subregion), " BRG_ " (right lower limb subregion).According to separation Mesh five districts are assigned on all summits in human body Partition Mask model meshes
MB = {MB0, MB1, MB2, MB3, MB4}
MB0: left arm subregion；MB1: right arm subregion；MB2: trunk subregion；MB3: left lower limb subregion MB4: right lower limb subregion
In each subregion MBi, storage belongs to all summits of current bay
MBi = {MBi0, MBi1, MBi2..., MBij}
MBij: MBiJth summit in subregion
Step 303, reads standardized human body's model data
Importing the standardized human body's model data having bound eyelid covering data, this part Mesh nodename is BodyMesh, to this Summit on BodyMesh grid carries out subregion by the MB subregion of step 3.
Zoning ordinance is as follows:
All vertex set SV are sequentially read from BodyMesh node
SV = {SV1, SV2, SV3..., SVn}
N-th summit in SVn: SV vertex set.
Traversal SV vertex set, takes out summit SV from SV gathersn, by summit SVnIn MB partitioned set find with SVnSame place MBij, same place by formula (1) (2) (3) calculate judge, meet formula (1) (2) (3) then simultaneously, SVn with MBij is same place,
SVn.x == MBij. x formula (1)
SVn.y == MBij.y formula (1)
SVn.z == MBij.z formula (1)
By formula (1) (2) (3) method, five districts are assigned on all summits in human body Partition Mask model meshes
SB = {SB0, SB1, SB2, SB3, SB4}
SB0: left arm subregion；SB1: right arm subregion；SB2: trunk subregion；SB3: left lower limb subregion SB4: right lower limb subregion
Each subregion SBiIn storage belong to all summits of current bay
SBi = {SBi0, SBi1, SBi2..., SBij}
SBij: SBiJth summit in subregion
Step 304, reads clothing Partition Mask model data
With step 303 in like manner, clothing template subregion is also divided into Liao Wuge district: " LM_ " (left arm subregion), " RM_ " (right arm divides District), " MM_ " (trunk subregion), " LG_ " (left lower limb subregion), " RG_ " (right lower limb subregion).According to the Mesh separated by clothes subregion Five districts are assigned on all summits on template model grid
MC = {MC1,MC2,MC3,MC4,MC5}
MC1: left arm subregion；MC2: right arm subregion；MC3: trunk subregion；MC4: left lower limb subregion MC5: right lower limb subregion
Each subregion MCiIn storage belong to all summits of current bay
MCi = {MCi0,MCi1,MCi2,...,MCij}
MCij: jth summit in MCi subregion
Step 305, reads and treats eyelid covering dress form data
Eyelid covering dress form data are treated in importing, and this part Mesh nodename is ClothMesh, on ClothMesh grid Summit carries out subregion by the MC subregion of step 5.
All vertex set SC are sequentially read from ClothMesh node
CV= {CV1, CV2, CV3..., CVn}
N-th summit in CVn: CV vertex set.
Traversal CV vertex set, takes out summit CV from CV gathersn, by summit CVnIn MB partitioned set find with CVnSame place MCij, same place by formula (1) (2) (3) calculate judge, meet formula (1) (2) (3) then simultaneously, SVn with MCij is same place,
CVn.x == MCij.x formula (1)
CVn.y == MCij.y formula (1)
CVn.z == MCij.z formula (1)
By formula (1) (2) (3) method, five districts are assigned on all summits in human body Partition Mask model meshes
SC= {SC0, SC1, SC2, SC3, SC4}
SC0: left arm subregion；SC1: right arm subregion；SC2: trunk subregion；SC3: left lower limb subregion SC4: right lower limb subregion
Each subregion SCiIn storage belong to all summits of current bay
SCi = {SCi0, SCi1, SCi2..., SCij}
SCij: SCiJth summit in subregion
Step 306, calculates with site
Treat each subregion summit SC on the dress form of eyelid coveringmi, at SBmMiddle traversal all summits SBmj, calculate each summit SCmj With SCmiEuclidean distance DSmj, obtain distance set DSm；
DSm= {DSm0, DSm1, DSm2..., DSmj}
Set DSm finds apart from short value DSmin:
DSmn == DSmin = min{DSm}
Then SBmnIt is exactly SCmiSame site.
Step 307, eyelid covering weight assignment
Skeleton cartoon (Skeletal Animation) is also referred to as Skeletal Skinned Animation (Skeletal Skinning Animation), it is the animation formed towards the skin movements drawn with position above skeleton by changing skeleton, especially It is suitable for the mankind and other vertebrates etc. has the animation simulation that framing structure is biological.
In skeleton cartoon, human skeleton animation uses the most extensive.In general, constructed by skeleton cartoon Human body can be represented by two parts: a part is the skeleton of tree structure, expression be skeleton and connect each skeleton Joint, it together constitutes the basic structure of human body, commonly referred to skeleton；The skin net that another part is attached on skeleton Lattice (Mesh), are skeleton " coats ", are also the animation parts that can be directly observed of user.Modal skin mesh type is It is made up of triangle surface.
The realization approach of skeleton cartoon is to produce from the motion mode of mankind itself.As a example by skeleton animation, Human skeleton is made up of multiple skeletons and joint, comprises the animation data of self in them.Under many circumstances, these skeletons and Joint is not single movement when human body moves.Such as, people is when curved elbow joint, and not only the skeleton of forearm is and then Mobile, owing to the skeleton of the interconnection function in joint, palm and finger has been also carried out movement simultaneously.It is to say, when people moves hands During a piece skeleton of arm " upstream ", any skeleton at this root skeleton " downstream " also can and then move on correct position.With What human skeleton was associated is a skin
Skin grid, it provides skin points positional information, texture coordinate information and the material information required for animation drafting.Skin net Each summit being affected in various degree by one or more skeletons on lattice, the most corresponding different weighted value of these impacts (Weight).When skeleton moves, the skin mesh drawing attached thereto is moved together, thus forms person model Animation effect.
The eyelid covering weighted value mentioned in the present invention, it is simply that each summit on grid receives the corresponding skeleton row of impact Table, and the weighted value that each skeleton is corresponding.It is defined as follows:
BW = <B={B1, B2..., Bn, W={W1, W2..., Wn}>
Bn: the skeleton node of association；Wn: skeleton BnEyelid covering weighted value
According to the calculated SC of step 7miSame site SBmn, by SBmnThe eyelid covering weighted value BW of pointSB(m n) is assigned to SCmi Eyelid covering weight BWSC(m, i):
BWSC(m, i)=BWSB(m,n)
Step 308, subregion seam is smooth to be sewed up
Owing to clothes grid model to be carried out the mode of the subregion assignment that eyelid covering weight assignment uses constantly in aforementioned process, because of This, there is larger difference in the eyelid covering weighted value between two adjacent subregions, causes the vertex movements shape of subregion seam crossing State difference is excessive there is grid sawtooth.The present invention uses the mode of the neighbor smoothing clothing to passing through after step 8 eyelid covering Threedimensional model does smooth operation and eliminates seam crossing grid sawtooth.
R is that eyelid covering smooths the vertex search radius of neighbourhood；For the summit SC on clothing threedimensional modelij, search with field radius R Rope SCijNeighborhood point.Calculate SCmnPoint and SCijDistance D between pointis(SCij, SCmn):
Dis(SCij, SCmn)=
If Dis(SCij, SCmn)≤R, then judge SCmnWith SCijSkeleton motion characteristic the most consistent, it is judged that standard: if The bone portion Bmn of BWmn=B1, B2 ... } and BWijBone portion Bij = {B1, B2... } and unordered equal, then SCmn With SCijSkeleton motion characteristic consistent, then SCmnIt is SCijSkeleton motion neighborhood point, be designated as NBt, by SCmnJoin SCij's Neighborhood point set NBij；
NBij = {NB0, NB1, NB2..., NBt}
All neighborhood points calculating smoothing weights in NBij is gathered:
Wij ={,,...,}
Weighted value after Wij:SCij smoothing processing；W (n): the weighted value of the n-th position in neighborhood point NBt weighted value list.
Part II: dynamically eyelid covering weighted value amendment
Step 401, posture converts
The eyelid covering weighted value of the clothing threedimensional model after completing the binding of above-mentioned eyelid covering is the most accurate, because clothing are three-dimensional The same site of model and human body skin model is not at same position, therefore the eyelid covering weighted value of the two point be similar rather than Identical.But in step 308 when clothing threedimensional model being carried out eyelid covering binding, with identical with site eyelid covering weighted value Rule completes eyelid covering bindings.Therefore, the eyelid covering weighted value being tied on clothing three-dimensional model gridding is inaccurate.Move at skeleton In picture, after skeleton posture converts, the moving displacement of clothing grid vertex also can produce displacement error, causes clothing threedimensional model There is the summit penetration phenomenon between model as shown in Figure 7 in summit on grid and the summit on human body skin.
At the beginning of dynamic eyelid covering weighted value is revised, according to the skeleton cartoon requirement in actual items, set the feature of skeleton Posture:
KP = {KP0, KP1, KP2...., KPn}
KP: need the crucial skeleton posture set of iterative processing.Iterative process starts to KPn to be considered as one from KP0 posture Secondary skeleton posture iteration.
Step 402, breakthrough point calculates
KPi(i 0,1,2 ..., n}) summits all on dress form are penetrated with human body skin model under posture and sentence Disconnected.It is the intersection point calculating space ray with planar delta that breakthrough point calculates core methed.If ray is not parallel with plane, will deposit At intersection point.As shown in Figure 8, it is known that ray L crosses a m(m1, m2, m3), and direction vector is VL(v1, v2, v3), triangular facet △ ABC plane P crosses a n(n1, n2, n3), and normal direction vector is VP(vp1, vp2, vp3), try to achieve the intersection point O of straight line and plane Coordinate (x, y, z).Linear equation is write as parametric equation form, is i.e. had:
x = m1 + v1 * t
y = m2 + v2 * t (1)
z = m3 + v3 * t
Plane equation is write as a normal equation form, is i.e. had:
vp1 * (x – n1) + vp2 * (y – n2) + vp3 * (z – n3) = 0 (2)
Then straight line necessarily meets formula (1) and (2), simultaneous two formula with the intersection point of plane, tries to achieve:
t=((n1-m1)*vp1+(n2-m2)*vp2+(n3-m3)*vp3)/(vp1*v1+vp2*v2+vp3*v3) (3)
If (3) in formula, denominator (vp1* v1+ vp2* v2+ vp3* v3) is 0, then it represents that straight line is parallel with plane, i.e. straight line Intersection point is not had with plane.After solving t, then t is substituted into formula (1) can try to achieve intersection point O coordinate (x, y, z).
(x, y, z) with parametric equation t parameter with plane point of intersection O can be calculated ray according to above-mentioned formula.If O point Inside triangular facet △ ABC, and t >=0, then penetrate between m point and triangular facet △ ABC.Thus it is calculated under KPi posture All breakthrough point set TPi.
TPi = {P0, P1, P2...., Pn}
Owing to human body is at each posture lower trunk, arm, lower limb, between there is blocking of each subregion, so when calculating breakthrough point still So calculate according to the breakthrough point between five corresponding subregions between subregion and dress form of anthropometric dummy, can not be across subregion meter Calculate breakthrough point.
Step 403, breakthrough point eyelid covering weighted value is dynamically revised
For breakthrough point SCij, eyelid covering weighted value Wij={ W0, W1..., Wn}；WijEyelid covering weighted value have three features:
①0 <= Wn <= 1
②0 <= <= 1
③Wmax = max{W0, W1..., WnCorresponding weight and corresponding skeleton be to SCijMoving displacement impact maximum.
Based on above-mentioned characteristic, when the weighted value of breakthrough point is made an amendment, according to characteristic 3. for WmaxModify, so The most 2. W is adjusted afterwards according to characteristicijIn other Wn(non-Wmax).
To WmaxAmendment divide three steps:
1. to WmaxMake increase amendment to attempt:
Wmax + = Wmax + CorrectValue
CorrectValue: weighted value to be modified increase and decrease amplitude；Must assure that Wmax≤ 1, if the W after modified calculatingmax More than 1, then WmaxIt is entered as 1；WijIn other Wn(non-Wmax) weighted value amendment:
Wn + = Wn - CorrectValue * Wn/ (1 - Wmax)
Must assure that Wn >=0, if W after modified calculatingnLess than 0, then WnIt is entered as 0；
The most again to amended WijIt is normalized:
Wn + = (1 - Wmax +) * Wn+/
Amended skeleton weighted value is Wij +
Wij + = {Wmax +, W0 +, W1 +..., Wn-1 +}
After skeleton weight modification, SCijThe point position of point, by real-time change, has new some position SCij +
SCij SCij +
Calculate first some position and the penetration range D penetrating triangular facet △ ABCPenetrate +, SCij after a position changes+ No longer penetrate, Then
DSPenetrate + = 0
SC after changing such as fruit dot positionij +Still penetrate, then
DSPenetrate +=Euclidean distance (SCij +, △ ABC)
2. to WmaxMake minimizing amendment to attempt:
Wmax -= Wmax - CorrectValue
Must assure that Wmax>=0, if the W after modified calculatingmaxLess than 0, then WmaxIt is entered as 0；WijIn other Wn(non- Wmax) weighted value amendment:
Wn - = Wn - CorrectValue * Wn/ (1 - Wmax)
Must assure that Wn >=0, if W after modified calculatingnLess than 0, then WnIt is entered as 0；
The most again to amended WijIt is normalized:
Wn= (1 - Wmax ) * Wn/ - (i ≠max)
Amended skeleton weighted value is Wij-
Wij - = {Wmax -, W0, W1..., Wn-1 }
After skeleton weight modification, the some position of SCij point, by real-time change, has new some position SCij -
SCij SCij -
Calculate first some position and the penetration range DS penetrating triangular facet △ ABCPenetrate +, SC after a position changesij -No longer wear Thoroughly, then
DSPenetrate - = 0
SC after changing such as fruit dot positionij -Still penetrate, then
DSPenetrate -=Euclidean distance (SCij -, △ ABC)
3. attempting amendment result according to the most 2. breakthrough point selects this breakthrough point to revise genuine policy, determines SCijThis amendment True weighted value Wij；
If DSPenetrate + < DSPenetrate -, then Wij= Wij +, otherwise Wij= Wij -。
Step 404, is iteratively repeated 402, and 403 until meeting convergence constraints: under current posture after eyelid covering binding amendment Breakthrough point number is 0；Then under KPi posture, eyelid covering weight iterative modifications completes；
Step 405, is adjusted to next posture by skeleton stance adjustment to posture KPi=KPi+1(), repeat 401,402,403, 404 steps, until i==n posture completes, then complete the eyelid covering weight iterative modifications of the most all postures；
Step 406, after completing step 405, travels through all postures in a KP posture set, and walks each posture Breakthrough point in rapid 402 calculates, and obtains the breakthrough point set TPS of dress form under all postures.
TPS = {TP0, TP1, TP2..., TPn}
Calculate different total numbers TP of breakthrough point in TPS setNum；
Step 407, it is judged that whether iteration eyelid covering has retrained, TPNumShreshold is breakthrough point number threshold value, if TPNum < =TPNumShreshold, iteration eyelid covering completes, and otherwise, repeats step 401 and arrives step 406, until meeting iteration to complete constraint Condition, completes whole iteration eyelid covering amendment process.

Claims (8)

1. a clothing threedimensional model automatic Bind Skin method, it is characterised in that comprise the steps of
(1) clothing threedimensional model eyelid covering weight assignment, for giving eyelid covering weight initial value to clothing threedimensional model；
(2) during skeleton motion, clothing threedimensional model penetrates summit eyelid covering weighted value and automatically revises, at skeleton cartoon During, grid vertex eyelid covering weight initial value inaccurate to clothing threedimensional model carries out dynamic corrections, to eliminate clothing mould Summit penetration phenomenon between type and human body skin model.
Clothing threedimensional model eyelid covering weight assignment the most according to claim 1, it is characterised in that human body master pattern, clothes Dress threedimensional model is according to human body Partition Mask, the grid division of clothing Partition Mask.
Clothing threedimensional model eyelid covering weight assignment the most according to claim 1, it is characterised in that human body skin model kimonos Dress threedimensional model calculates with site.
Clothing threedimensional model eyelid covering weight assignment the most according to claim 1, it is characterised in that clothing three-dimensional model gridding Summit in human body skin model with site eyelid covering weight assignment.
Clothing threedimensional model eyelid covering weight assignment the most according to claim 1, it is characterised in that clothing three-dimensional model gridding Summit subregion seam is smooth to be sewed up.
During skeleton motion the most according to claim 1, clothing threedimensional model penetrates summit eyelid covering weighted value and automatically repaiies Just, it is characterised in that clothing threedimensional model calculates based on human body skin model breakthrough point.
During skeleton motion the most according to claim 1, clothing threedimensional model penetrates summit eyelid covering weighted value and automatically repaiies Just, it is characterised in that clothing threedimensional model breakthrough point eyelid covering weighted value is dynamically revised.
During skeleton motion the most according to claim 1, clothing threedimensional model penetrates summit eyelid covering weighted value and automatically repaiies Just, it is characterised in that the iterative processing that under bone site pattern conversion, clothing threedimensional model breakthrough point eyelid covering is revised automatically.
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