CN104616335A - Three-dimensional character loop animation automatic accumulation method - Google Patents
Three-dimensional character loop animation automatic accumulation method Download PDFInfo
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- CN104616335A CN104616335A CN201510085169.6A CN201510085169A CN104616335A CN 104616335 A CN104616335 A CN 104616335A CN 201510085169 A CN201510085169 A CN 201510085169A CN 104616335 A CN104616335 A CN 104616335A
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- G—PHYSICS
- 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
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Abstract
The invention discloses a three-dimensional character loop animation automatic accumulation method. The method includes the steps of calculating relative location Qk of a controller Ck corresponding to every portion of a character with an abdomen center point of the character as the origin of a coordinate for a three-dimensional character model completing frame binding; performing spaced sampling along a character movement path S, and calculating the normal Nn and the tangent Tn of a path curve of every sampling point; calculating a rotational transformation matrix Mn between two consecutive sampling points according to the normal Nn and the tangent Tn; calculating a step conversion factor Stepn of the controller Ck corresponding to every portion of the three-dimensional character; calculating displacement and rotation animation data of the controller Ck corresponding to every portion of the character during the movement along the movement path S after taking step accumulation into consideration according to the step conversion factor Stepn. The three-dimensional character loop animation automatic accumulation method provides a quick automatic generation method for common animation of characters moving along paths of three-dimensional animation.
Description
Technical field
The invention belongs to 3D animation design technical field, be specifically related to a kind of method for automatically accumulating of three-dimensional character circulation animation.
Background technology
Three-dimensional animation technology is a kind of emerging technology produced along with the development of computer hardware technique in recent years, can produce three-dimensional animation or the video display basic lens of satisfied director's demand quickly and easily.
The producing principle of three-dimensional animation is generally: first, utilizes three-dimensional software (such as 3ds Max, Maya or Houdini) to set up a virtual world in a computer; Then, in the three-dimensional world that this is virtual, the three-dimensional model such as scene and three-dimensional cartoon character is added; Finally, the animation curve of setting model, the movement locus of virtual camera and other animation parameters, play up and obtain role animation.
Due to three-dimensional animation technology possess can the true scene of accurate analog, almost without feature such as creation restriction etc., be widely used in the numerous areas such as amusement, education, military affairs at present.
For the application of entertainment field, cartoon figure's moulding that usual needs provide according to designer, make corresponding three-dimensional animation role and bone binding system, and by arranging different key frame numerical value at different time points, thus make it to possess the action true to nature meeting role's personality, age or other features.
Current animation makes, and common technology is mainly divided into keyframe techniques, based on the motion capture technology of true man's performance, and physical simulation techniques three class.Rear two class technology have automation mechanized operation, feature true to nature fast, and without the need to animation, teacher arranges key frame, saves a large amount of manpower, but it is helpless to exaggerate action really for cartoon character non-physical.When making cartoon character animation, for saving time, animation teacher often produces the action in one-period, then loop play, form one section of continuous print animation, the walking of such as role, to run, bipod can be decomposed into and respectively step the cycle of the action of a step repeatedly.
But, be only loop play, role can be made to remain where one is.In addition, in order to make the walking of role, run etc., animation seems unlike mechanical motion, needs in cycle period, add more variations in detail, makes the action of role not be the entirely mechanical action repeating the previous cycle in whole motion process.Current, three-dimensional animation production instrument does not provide perfect solution, need the position of animation Shi Shoudong more new role as you were to avoid, and according to the motion path of role, carry out corresponding to revise by hand to the motion at role each position with it, such as during riding, the displacement of bipod and angle change are slightly discrepant.Object of the present invention is exactly for FAQs in above making, provides a kind of quick Solution of robotization.
Summary of the invention
In view of this, the object of this invention is to provide a kind of method for automatically accumulating of three-dimensional character circulation animation, the method can generate the animation that role moves along plane upper pathway fast.
Technical scheme of the present invention is as follows:
A method for automatically accumulating for three-dimensional character circulation animation, concrete steps are:
Step one, for the three-dimensional character model completing bone binding, using the reference point of role's belly central point R as three-dimensional character model, using role's belly central point as true origin, calculates the controller C that each position of role is corresponding
krelative position Q
k, k=0,1,2 ... K-1, K are the sum of controller, described relative position Q
kfor calculating under the coordinate system of true origin using role's belly central point; Equidistantly sample along role's mobile route S, calculate the normal N of each sample point path curve
nwith tangent line T
n;
Step 2, according to described N
nwith tangent line T
n, calculate the rotational transformation matrix M between continuous two sampled points
n; Based on described cyclic transformation matrix M
nthe controller C corresponding with each position
krelative position Q
k, calculate the controller C that each position of three-dimensional character is corresponding
kstride transformation factor Step
n;
Step 3, according to described stride transformation factor Step
n, calculate the controller C that each position of role is corresponding
kalong consider in mobile route S motion process stride accumulation after displacement and rotate animation data.
Further, the process of step 3 of the present invention is:
301, phase information phi and the positional information Pt of role's belly central point R when role moves t along mobile route S is calculated;
302, based on described phase information phi and positional information Pt, according to stride transformation factor Step
ncalculate the controller C that in three-dimensional character, each position is corresponding
kdisplacement coordinate when t;
303, according to described phase place phi, the controller C that in three-dimensional character, each position is corresponding is calculated
krotation when t.
Further, in step 303 of the present invention, each position is divided into the position of noncontact surface location and kiss the earth;
Calculate the controller C that the position on noncontact ground in three-dimensional character is corresponding
k1rotating to be when t:
If three-dimensional character is positioned at sampled point S in t
mand S
m+1between, according to phase place phi, to sampled point S
mwith sampled point S
m+1the rotational transformation matrix M at place
mand M
m+1carry out interpolation, obtain the rotational transformation matrix M of t
t, utilize M
tto controller C
k1carry out rotational transform.
Calculate the controller C that the position of kiss the earth in three-dimensional character is corresponding
k2rotating to be when t:
First, obtain in a circulation animation cycle, the time Tt on sole or toes make contact ground, calculate in the time Tt on sole or toes make contact ground, the rotational transformation matrix M ' that three-dimensional character is moved completed along mobile route, calculate the inverse-transform matrix M of M '
-1; Need to arrange a time range T according to animation
r, make inverse-transform matrix M
-1at T
rgradually become unit matrix I in time, obtain T
rthe inverse-transform matrix M in each moment in time
j -1;
Then, situation of dividing calculates sole or controller C corresponding to toe
k2at the rotational transformation matrix M of t
t;
1) if t, sole or toes make contact ground, now M
tfor unit matrix;
2) if t, sole or the non-kiss the earth of toe and be carved with contact upper a period of time, mark current time is T
0, according to the M at the position on noncontact ground
taccount form, calculates the rotational transformation matrix M of t
temp, now M
tfor M
temp+ M
-1;
3) if t, sole or the non-kiss the earth of toe and t are at time range T
rin, then according to t distance T
0the relative value of time in Tr, obtain the inverse-transform matrix M of t
j -1, now M
tfor M
temp+ M
j -1;
4) when t do not belong to above three kinds of situations time, now according to the M at the position on noncontact ground
taccount form, calculates the rotation transformation matrices M of t
t.
Finally utilize M
tto the controller C of sole or toe
k2carry out rotational transform.
Further, the present invention also comprises for amplitude or phase place change are added in the motion above the waist of role in circulation animation; Process is:
Obtain the controller C above the waist corresponding to each position in this circulation animation
k3each property value v, then carry out the linear transformation of A × v+b;
If that v representative is C
k3displacement, so A be exactly movement range conversion multiple, b is the skew of displacement; If that v representative is C
k3rotation, so A is exactly the multiple of rotational steps, and b is exactly the skew of the anglec of rotation.
Beneficial effect:
1, the present invention only needs animation teacher to provide the animation of the circulation in one-period, can generate the path animation of three-dimensional character fast and automatically, and avoid sliding steps phenomenon.
2, the present invention is divided into sole or toe to leave the multiple situation such as ground and kiss the earth, carries out rotation animation respectively to it, can provide the fine detail of step motion in circulation animation.
3, the present invention can carry out details adjustment to the animation of each cycle period forming path animation, thus the path animation of role is seemed is not the repetition of machinery.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for automatically accumulating of three-dimensional character circulation animation of the present invention.
Embodiment
Below in conjunction with accompanying drawing and instantiation, the present invention is described in detail.
As shown in Figure 1, the method for automatically accumulating of a kind of three-dimensional character circulation of the present invention animation, concrete steps are:
Step one, for the three-dimensional character model completing bone binding, using the reference point of role's belly central point R as three-dimensional character model, using role's belly central point as true origin, calculates the controller C that each position of role is corresponding
krelative position Q
k, k=0,1,2 ... K-1, K are the sum of controller, described relative position Q
kfor calculating under the coordinate system of true origin using role's belly central point; Equidistantly sample along role's mobile route S, calculate the normal N of each sample point path curve
nwith tangent line T
n.
S101, when the 0th frame, if three-dimensional character is positioned at the starting point place of mobile route S, using role's belly center as true origin R, calculate the coordinate vector Q of controller corresponding to each position of role
k, k=0,1,2 ... K-1, K are the sum of controller.
Stride in S102, foot's circulation animation of making according to animation teacher, obtain the displacement d of three-dimensional character in a circulation animation cycle, namely left and right pin is each steps the displacement after a step; And obtain the cycle T c of circulation animation, the overall duration of Tc and circulation animation.
S103, set the length of mobile route S of three-dimensional character as L, then N=L/d is the sampled point quantity on mobile route.Mobile route S carries out be equidistantly the sampling of d, obtain sampled point S
n, its position is P
n; The tangent line vector calculating each sample point is T
nand normal vector N
n, wherein n=0,1,2 ... N-1.Suppose T
n=(a, b, c), so N
n=(b ,-a, 0).Here all vectors have all done normalized.
Step 2, according to described N
nwith tangent line T
n, calculate the rotational transformation matrix M between continuous two sampled points
n; Based on described cyclic transformation matrix M
nthe controller C corresponding with each position
krelative position Q
k, calculate the controller C that each position of three-dimensional character is corresponding
kstride transformation factor Step
n.Concrete steps are as follows:
1) sampled point S is calculated
nplace tangent line vector T
nrelative to sampled point S
n-1place tangent line vector T
n-1rotational transformation matrix M
n.
2) the controller C that each position of three-dimensional character is corresponding is calculated
kat sampled point S
nplace is relative to sampled point S
n-1the displacement deltaP at place
n=M
n〃 Q
k+ (P
n-P
n-1).Then sampled point S
nthe stride transformation factor Step at place
n=| deltaP
n|/d.
Step 3, according to described stride transformation factor Step
n, calculate the controller C that each position of role is corresponding
kalong consider in mobile route S motion process stride accumulation after displacement and rotate animation data.Concrete steps are as follows:
(1) the positional information Pt of role's belly central point R and the phase information phi of three-dimensional character circulation animation when role moves t along mobile route S, is calculated.
If three-dimensional character is positioned at sampled point S in t
mand S
m+1between, wherein m=Floor [t/Tc], Floor represents bracket function, the phase place phi=t/Tc-Floor of t role in circulation animation cycle [t/Tc].
According to phi, P
m, P
m+1, and P
m+2, utilize secondary Bezier, the positional information Pt of t R can be obtained.Computing method are, if connect S
m, S
m+1, and S
m+2piecewise function B (x) be
B(x)＝(1-x)
2P
m+2x(1-x)P
m+1+x
2P
m+2
Pt＝B(phi/2)
Wherein, parameter x span is [0,1], expression be three-dimensional character in t from S
mto S
m+2two circulation animation cycle in phase information because above-mentioned phi be three-dimensional character in t from S
mto S
m+1phase information in a circulation animation cycle, so at t x=phi/2.
In order to the automatic accumulation realizing three-dimensional character circulation animation needs to obtain in the displacement coordinate of moment t and rotational transform, the automatic accumulation of three-dimensional character circulation animation could be controlled according to described displacement coordinate and rotational transform.
(2), the controller C that in three-dimensional character, each position is corresponding is calculated
kx, y coordinate when t.
Calculate t C
krelative time Tr=phi × Tc in circulation animation cycle Tc, according to C in circulation animation
kdisplacement animation curve, obtain Tr moment C
kdisplacement (x, y), calculate and consider the shift value after accumulative effect (x ', y '), wherein x '=x × Step
n+ Pt, y '=y × Step
n+ Pt.Because the present invention only for three-dimensional character in smooth ground motion, so controller C
kunaffected perpendicular to the animation data in direction, ground.
(3), the controller C that in three-dimensional character, each position, noncontact ground is corresponding is calculated
k1rotational transform when t.According to phase place phi, to sampled point S
mwith sampled point S
m+1the rotational transformation matrix M at place
mand M
m+1carry out interpolation, obtain the rotational transformation matrix M of t
t, utilize M
tto controller C
k1carry out rotational transform.
(4) the controller C having kiss the earth position corresponding in three-dimensional character is calculated
k2rotational transform when t.These positions comprise sole and toe, they are being walked and are needing kiss the earth to provide the power of advance in running process, so within the time of kiss the earth non rotating, then can there be the change of rotation at other positions of three-dimensional character health with mobile route curve.
First, obtain in a circulation animation cycle, the time Tt on sole or toes make contact ground, calculate in the time Tt on sole or toes make contact ground, the rotational transformation matrix M ' that three-dimensional character is moved completed along mobile route, then calculates the inverse-transform matrix M of M '
-1.Need to arrange a time range T according to animation
r, sole or toe are by the above-mentioned T after leaving ground
rthe rotation of health is progressively caught up with, therefore by inverse-transform matrix M in time
-1at T
rgradually become unit matrix I in time, and obtain T
rthe inverse-transform matrix M in each moment in time
j -1,
Then, four kinds of situations are divided to calculate soles or controller C corresponding to toe
k2at the rotational transformation matrix M of t
t.The division of described four kinds of situations does not rotate with other positions of health when kiss the earth in order to ensure sole or toe, but can at T after liftoff
rprogressively make up in time and the difference of other positions of health in the anglec of rotation, at T
rother position synchronous rotaries are then followed after time.
1) if t, sole or toes make contact ground, now M
tfor unit matrix.
2) if t, sole or the non-kiss the earth of toe and be carved with contact upper a period of time, mark current time is T
0, the rotational transformation matrix M of t is calculated according to the method in step (3)
temp, now M
tfor M
temp+ M
-1.
3) if t, sole or the non-kiss the earth of toe and t are at time range T
rin, then need according to t distance T
0the relative value of time in Tr, obtain the inverse-transform matrix M of t
j -1, now M
tfor M
temp+ M
j -1.
4) when t do not belong to above three kinds of situations time, now M
ttransformation matrices M is rotated for calculating according to the method in step (3)
t.
Finally utilize M
tto controller C
k2carry out rotational transform.
In order to make the effect of circulation animation seem more true to nature, it is not mechanical repetition that the path animation of role is seemed, the present invention also comprises the step 4 of role's motion above the waist being added to amplitude or phase place change.
Step 4, for amplitude or phase place change are added in the motion above the waist of role in circulation animation.
Principle is, obtains the controller C above the waist corresponding to each position in this circulation animation
k3each property value v, then carry out the linear transformation of A × v+b.
If that v representative is C
k3displacement, so A be exactly movement range conversion multiple, b is the skew of displacement.If that v representative is C
k3rotation, so A is exactly the multiple of rotational steps, and b is exactly the skew of the anglec of rotation.It is noted herein that if the property value of controller is vector, then conversion needs to convert the institute of this vector is important, and such as P represents displacement vector, and so conversion needs the x to P, and y, the component of z-axis all converts simultaneously.
The single cycle animation data of input can add up by the present invention automatically, thus produces step and move on the ground but not the effect of sliding steps, and has carried as circulation animation adds the function of amplitude or phase place change, and the animation in each cycle is not quite similar.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a method for automatically accumulating for three-dimensional character circulation animation, is characterized in that, concrete steps are:
Step one, for the three-dimensional character model completing bone binding, using the reference point of role's belly central point R as three-dimensional character model, using role's belly central point as true origin, calculates the controller C that each position of role is corresponding
krelative position Q
k, k=0,1,2 ... K-1, K are the sum of controller, described relative position Q
kfor calculating under the coordinate system of true origin using role's belly central point; Equidistantly sample along role's mobile route S, calculate the normal N of each sample point path curve
nwith tangent line T
n;
Step 2, according to described N
nwith tangent line T
n, calculate the rotational transformation matrix M between continuous two sampled points
n; Based on described cyclic transformation matrix M
nthe controller C corresponding with each position
krelative position Q
k, calculate the controller C that each position of three-dimensional character is corresponding
kstride transformation factor Step
n;
Step 3, according to described stride transformation factor Step
n, calculate the controller C that each position of role is corresponding
kalong consider in mobile route S motion process stride accumulation after displacement and rotate animation data.
2. the method for automatically accumulating of three-dimensional character circulation animation according to claim 1, it is characterized in that, the process of described step 3 is:
301, phase information phi and the positional information Pt of role's belly central point R when role moves t along mobile route S is calculated;
302, based on described phase information phi and positional information Pt, according to stride transformation factor Step
ncalculate the controller C that in three-dimensional character, each position is corresponding
kdisplacement coordinate when t;
303, according to described phase place phi, the controller C that in three-dimensional character, each position is corresponding is calculated
krotation when t.
3. the method for automatically accumulating of three-dimensional character circulation animation according to claim 2, is characterized in that, in described step 303, each position is divided into the position of noncontact surface location and kiss the earth;
Calculate the controller C that the position on noncontact ground in three-dimensional character is corresponding
k1rotating to be when t:
If three-dimensional character is positioned at sampled point S in t
mand S
m+1between, according to phase place phi, to sampled point S
mwith sampled point S
m+1the rotational transformation matrix M at place
mand M
m+1carry out interpolation, obtain the rotational transformation matrix M of t
t, utilize M
tto controller C
k1carry out rotational transform;
Calculate the controller C that the position of kiss the earth in three-dimensional character is corresponding
k2rotating to be when t:
First, obtain in a circulation animation cycle, the time Tt on sole or toes make contact ground, calculate in the time Tt on sole or toes make contact ground, the rotational transformation matrix M ' that three-dimensional character is moved completed along mobile route, calculate the inverse-transform matrix M of M '
-1; Need to arrange a time range T according to animation
r, make inverse-transform matrix M
-1at T
rgradually become unit matrix I in time, obtain T
rthe inverse-transform matrix M in each moment in time
j -1;
Then, situation of dividing calculates sole or controller C corresponding to toe
k2at the rotational transformation matrix M of t
t;
1) if t, sole or toes make contact ground, now M
tfor unit matrix;
2) if t, sole or the non-kiss the earth of toe and be carved with contact upper a period of time, mark current time is T
0, according to the M at the position on noncontact ground
taccount form, calculates the rotational transformation matrix M of t
temp, now M
tfor M
temp+ M
-1;
3) if t, sole or the non-kiss the earth of toe and t are at time range T
rin, then according to t distance T
0the relative value of time in Tr, obtain the inverse-transform matrix M of t
j -1, now M
tfor M
temp+ M
j -1;
4) when t do not belong to above three kinds of situations time, now according to the M at the position on noncontact ground
taccount form, calculates the rotation transformation matrices M of t
t;
Finally utilize M
tto the controller C of sole or toe
k2carry out rotational transform.
4. the method for automatically accumulating of three-dimensional character circulation animation according to claim 1, is characterized in that, also comprises for amplitude or phase place change are added in the motion above the waist of role in circulation animation; Process is:
Obtain the controller C above the waist corresponding to each position in this circulation animation
k3each property value v, then carry out the linear transformation of A × v+b;
If that v representative is C
k3displacement, so A be exactly movement range conversion multiple, b is the skew of displacement; If that v representative is C
k3rotation, so A is exactly the multiple of rotational steps, and b is exactly the skew of the anglec of rotation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106097416A (en) * | 2016-06-12 | 2016-11-09 | 天脉聚源（北京）教育科技有限公司 | A kind of method and device that object mobile route is set |
| CN108073861A (en) * | 2016-11-16 | 2018-05-25 | 东北大学秦皇岛分校 | A kind of new abnormal gait analysis method and system |
| CN111273780A (en) * | 2020-02-21 | 2020-06-12 | 腾讯科技（深圳）有限公司 | Animation playing method, device and equipment based on virtual environment and storage medium |
| CN113963090A (en) * | 2021-10-20 | 2022-01-21 | 李舟 | Maya animation role footstep fixing tool |
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| CN101549207A (en) * | 2008-04-04 | 2009-10-07 | 株式会社万代南梦宫游戏 | Game movie distribution method and system |
| CN101595510A (en) * | 2006-11-15 | 2009-12-02 | Iam集团公司 | Be used to create, make and the method for distributing three-dimensional models |
| CN103514622A (en) * | 2012-06-29 | 2014-01-15 | 甲尚股份有限公司 | System and method for automatically adapting gait of virtual character to terrain |
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| CN101595510A (en) * | 2006-11-15 | 2009-12-02 | Iam集团公司 | Be used to create, make and the method for distributing three-dimensional models |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106097416A (en) * | 2016-06-12 | 2016-11-09 | 天脉聚源（北京）教育科技有限公司 | A kind of method and device that object mobile route is set |
| CN108073861A (en) * | 2016-11-16 | 2018-05-25 | 东北大学秦皇岛分校 | A kind of new abnormal gait analysis method and system |
| CN108073861B (en) * | 2016-11-16 | 2020-05-15 | 东北大学秦皇岛分校 | Novel abnormal gait analysis method and system |
| CN111273780A (en) * | 2020-02-21 | 2020-06-12 | 腾讯科技（深圳）有限公司 | Animation playing method, device and equipment based on virtual environment and storage medium |
| CN113963090A (en) * | 2021-10-20 | 2022-01-21 | 李舟 | Maya animation role footstep fixing tool |
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| Publication number | Publication date |
|---|---|
| CN104616335B (en) | 2017-08-25 |
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