CN104318600A - Method for achieving role treading track animation by using Bezier curve - Google Patents

Method for achieving role treading track animation by using Bezier curve Download PDF

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CN104318600A
CN104318600A CN201410530731.7A CN201410530731A CN104318600A CN 104318600 A CN104318600 A CN 104318600A CN 201410530731 A CN201410530731 A CN 201410530731A CN 104318600 A CN104318600 A CN 104318600A
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animation
role
bezier
point
frame
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CN104318600B (en
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张翼
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Of Ancient India Day Infotech Share Co Ltd In Wuxi
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Of Ancient India Day Infotech Share Co Ltd In Wuxi
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T13/00Animation
    • G06T13/203D [Three Dimensional] animation
    • G06T13/403D [Three Dimensional] animation of characters, e.g. humans, animals or virtual beings

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Abstract

The invention discloses a method for achieving role treading track animation by using Bezier curve. The method mainly includes: storing animation object parameters into one or more animation channels; in each animation channel, setting a series of key frames for the animation to impel the motion state of the animation in the default time; performing interpolation calculation among the animation key frames in each channel, thus enabling a role to walk along an appointed curve, and thereby forming a vivid role animation effect. The method for achieving role treading track animation by using Bezier curve can overcome the defects that the prior art is tedious in operating process, high in cost and small in application range, thus achieving the advantages of concise operating process, low cost and wide application range.

Description

A kind of method using Bézier curve to realize role's run trace animation
Technical field
The present invention relates to computer realm, particularly, relate to a kind of method using Bézier curve to realize role's run trace animation.
Background technology
Computer animation combines computer graphics particularly realistic image synthesis technology, image processing techniques, and motion control principle, video display technology, also relates to robotics, the fields such as artificial intelligence.At present more using its integrated application as computer graphics, in computer animation, need the movement locus using design object, in game too, in order to show level and smooth curvilinear motion.
Can play the track execution of role animation at three-dimensional software at present, need to insert in game by third party's plug-in unit, but the run trace of this role be transplanted to oneself research and development game engine in the middle of be inapplicable.
Realizing in process of the present invention, inventor finds at least to exist in prior art the defect such as operating process is loaded down with trivial details, cost is high and the scope of application is little.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of method using Bézier curve to realize role's run trace animation, to realize the advantage that operating process is succinct, cost is low and applied widely.
For achieving the above object, the technical solution used in the present invention is: a kind of method using Bézier curve to realize role's run trace animation, mainly comprises:
A, be saved in an animation path or multiple animation path have animate object parameter;
B, in each animation path, for animation sets a series of key frame to order about the motion state at predetermined time animation;
C, carry out interpolation calculation in each passage between animation key frame, obtain role along the curved path walking of specifying, form role animation effect true to nature.
Further, described step a, specifically comprises:
When animation modeling, it is each role animation setting key frame data;
The key frame data of setting is saved in animation path; This key frame data, comprises the rotation of object, translation, convergent-divergent and User Defined parameter.
Further, described step b, specifically comprises:
The broadcasting of animation is realized by the rotation of object model, translation, convergent-divergent, object model three coordinate axis X in preserving in each animation path, the translation of Y, Z, rotation, convergent-divergent component and each passage independently use, and can combination in any to express the animation of multi-Dimensional parameters;
In key-frame animation, passage is divided into two classes: Bezier type and level-type, and corresponding preservation Bezier frame BezierKey and level frame PulseKey, each Bezier frame has reference mark, left and right, can control the change of Bezier interpolation.
Further, described step c, specifically comprises:
In any t, the animation numerical result in animation path can be obtained by the Bezier section of aforementioned acquisition, to enable role animation run trace smooth excessiveness, needing to carry out interpolation to Bezier and obtaining.
Further, described interpolation algorithm is as follows:
By summit P0, P1, P2, P3 define a Bezier, and wherein P (t) is the point coordinate under the t time
For any time, the Bezier value of animation is:
Concrete interpolation computing method is as follows:
First to adopting dichotomy to calculate the position judging a certain frame place Bezier in this moment between two key frames;
It is o point that the known some time is engraved in Bezier time point on curve, between two key frames, get mid point, judges the Left or right of o point at center line, and after judging, this point is positioned at the left side of first time two minutes center lines;
Then the mid point getting institute's on the left side successively judges, under normal circumstances, two key frame maximal value divide value are 32 parts and satisfy the demands, last intersection point p and q getting nearest equinoctial line adjacent with o point and key frame curve successively, get the mid point o ' of p and q point line, the value of o ' so is now approximately equal to the value of O point.
After interpolation calculation between the key frame of role animation, just can obtain role along the curved path walking of specifying, thus define role animation effect true to nature.
The use Bézier curve of various embodiments of the present invention realizes the method for role's run trace animation, owing to mainly comprising: be saved in have animate object parameter in an animation path or multiple animation path; In each animation path, for animation sets a series of key frame to order about the motion state at predetermined time animation; Carry out interpolation calculation in each passage between animation key frame, obtain role along the curved path walking of specifying, form role animation effect true to nature; Thus the defect that in prior art, operating process is loaded down with trivial details, cost is high and the scope of application is little can be overcome, to realize the advantage that operating process is succinct, cost is low and applied widely.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, or understand by implementing the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is that the present invention uses Bézier curve to realize the inheritance schematic diagram of animation key frame in the method Program of role's run trace animation;
Fig. 2 is that the present invention uses Bézier curve to realize the handle schematic diagram at Bezier reference mark in the method for role's run trace animation;
Fig. 3 is that the present invention uses Bézier curve to realize the position view of binary search o frame in picture in the method for role's run trace animation;
Fig. 4 is that the present invention uses Bézier curve to realize calculating in the method for role's run trace animation the reduced graph of position, o frame place;
Fig. 5 is that the present invention uses Bézier curve to realize Bézier curve in the method for role's run trace animation to realize role's run trace animation process flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Bezier (B é zier) curve is a kind of parametric line based on approaching, and it seems, and one group of B é zier characteristic polygon defines, and Bézier curve always come by first and last reference mark.The initial point of curve and terminal overlap with this polygonal viewpoint and terminal, and the existing Article 1 limit of multilist and the last item limit show respectively the tangent line direction vector of curve at initial point and destination county.The shape of curve is tending towards polygon, and polygon can have its summit to define, and these summits are called as reference mark, as long as provide reference mark just can generate a Bezier.
In order to address this problem, the present invention utilizes curve editing to simulate the animation of role's run trace, if the movement locus of given object, ask the position of object in a certain frame picture, the movement locus of object all represents with Parameter Spline line, so parameter and frame frequency have relation, must carry out equal interval sampling to parameter space, utilize curve segment interpolation algorithm to complete the overall animation of intermediate frame composition.
According to the embodiment of the present invention, as Figure 1-Figure 5, provide a kind of method using Bézier curve to realize role's run trace animation, relate in particular to utilize curve editing to regulate the method for role animation run trace in game.
In the inventive solutions, utilize curve editor to realize the flow process of editor's role track animation:
First: be saved in an animation path or multiple animation path having animate object parameter
When animation modeling, play according to our wish to make animation, for each role animation setting key frame data, the parameter of these animations comprises the rotation of object, translation, convergent-divergent also have User Defined parameter etc., then these image parameters is saved in animation path.
Second: be made up of a series of key frame in each animation path
In each animation path, for animation sets certain key frame to order about the motion state at certain moment animation.
The broadcasting of animation is by the rotation of object model, translation, convergent-divergent is relevant, object model three coordinate axis X in preserving in each animation path, Y, the translation of Z, rotate, convergent-divergent component and each passage independently use, and can combination in any to express the animation of multi-Dimensional parameters, if the angular field of view FOV parameter of such as camera does animation, it is exactly a Bezier passage, the displacement animation of an object, x is represented respectively exactly by 3 Bezier passages, y, the animation of z tri-components, save as in animation path, the rotation of such as object and displacement and convergent-divergent, preserve with 9 Bezier animation path:
BezierChannel m_PosX;
BezierChannel m_PosY;
BezierChannel m_PosZ;
BezierChannel m_RotX;
BezierChannel m_RotY;
BezierChannel m_RotZ;
BezierChannel m_SclX;
BezierChannel m_SclY;
BezierChannel m_SclZ;
In actual application, the convergent-divergent of character object is not considered, and we only study the rotation of object and displacement.
In the key-frame animation of realization of the present invention, passage is divided into two classes: Bezier type and level-type, and corresponding preservation Bezier frame (BezierKey) and level frame (PulseKey), each Bezier frame has reference mark, left and right, can control the change of Bezier interpolation.Level frame is then as level line, and whether for describing the animation of level signal formula change, being used for simulation character object in gaming " lands " animation.
Wherein Bezier frame and level frame are all the subclasses of animation frame (AnimationKey).
The in store respective independently a series of animation key frame of each Bezier passage, by function BOOL BuildBezierChain (std::vector<Simple2DBezier> & vOutBeziers); Obtain the multistage Bezier section be made up of key frame in a Bezier passage, that is: a curve can cut into two or any many strips curve in arbitrfary point, and each curve is still Bezier.What technical solution of the present invention described is the setting of Bezier to role's track animation, seldom makes a search to level frame.
3rd, carry out interpolation calculation between animation key frame.
In any t, the animation numerical result in animation path can be obtained by the Bezier section of aforementioned acquisition, to enable role animation run trace smooth excessiveness, needing to carry out interpolation to Bezier and obtaining.
Its interpolation algorithm is as follows:
As Fig. 2 we using the insertion point of P0 and P3 as key frame, so the right handles of P0 frame and the left handle of P3 represent P1 and P2 respectively, and four points putting equation in this, as three Bezier carry out the interpolation change of controlling curve.What the present invention adopted is cubic Bézier curve, and this curve representation ability is strong, and shape controlling is convenient, avoids the increase calculated because higher order polynomial brings simultaneously.
By summit P0, P1, P2, P3 definable Bezier, wherein P (t) is the point coordinate under the t time
For any time, the Bezier value of animation is:
Concrete interpolation computing method is as follows:
First we calculate to adopting dichotomy between two key frames the position judging a certain frame place Bezier in this moment.
It is o point that the known some time is engraved in Bezier time point on curve, mid point is got between two key frames, judge the Left or right of o point at center line, after judging, this point is positioned at the left side (as Fig. 3) of first time two minutes center lines, then the mid point getting institute's on the left side successively judges, under normal circumstances, two key frame maximal value divide value are 32 parts and satisfy the demands, last intersection point p and q getting nearest equinoctial line adjacent with o point and key frame curve successively, in shown in Fig. 4, get the mid point o ' of p and q point line, the value of o ' so is now approximately equal to the value of O point.
Concrete value finding function is as follows
float GetValueAtTime(float fTime);
// value to the displacement of object, is actually the combination evaluation of the passage to X, Y, Z component
D3DXVECTOR3 GetPos(float fTime)
{
D3DXVECTOR3 v3dPos;
v3dPos.x = m_PosX.GetKeyCount() m_PosX.GetValueAtTime(fTime) : m_defaultPos.x;
v3dPos.y = m_PosY.GetKeyCount() m_PosY.GetValueAtTime(fTime) : m_defaultPos.y;
v3dPos.z = m_PosZ.GetKeyCount() m_PosZ.GetValueAtTime(fTime) : m_defaultPos.z;
Return v3dPos; // return role's object composition shift value
}
// rotation value to object, is actually X, Y, the combination evaluation of the passage of Z component
D3DXVECTOR3 GetRot(float fTime)
{ D3DXVECTOR3 v3dRot;
v3dRot.x = SMath::AngleToRadians( m_RotX.GetKeyCount() m_RotX.GetValueAtTime(fTime) : m_defaultRot.x );
v3dRot.y = SMath::AngleToRadians( m_RotY.GetKeyCount() m_RotY.GetValueAtTime(fTime) : m_defaultRot.y );
v3dRot.z = SMath::AngleToRadians( m_RotZ.GetKeyCount() m_RotZ.GetValueAtTime(fTime) : m_defaultRot.z );
Return v3dRot; // return role's object composition rotational value
}
In sum, after interpolation calculation between the key frame of role animation, just can obtain role along the curved path walking of specifying, thus define role animation effect true to nature.
Technical scheme of the present invention, utilize parameter of curve edit mode to complete the key-frame animation of the track of role's walking, the beneficial effect that at least can reach comprises: (1) have larger degree of freedom to carry out controlling curve shape, and then the track animation of control role; (2) utilize Bezier to simplify calculating, can by vector or matrix representation geometric component; (3) control more directly perceived to cartoon track.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.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 (5)

1. use Bézier curve to realize a method for role's run trace animation, it is characterized in that, mainly comprise:
A, be saved in an animation path or multiple animation path have animate object parameter;
B, in each animation path, for animation sets a series of key frame to order about the motion state at predetermined time animation;
C, carry out interpolation calculation in each passage between animation key frame, obtain role along the curved path walking of specifying, form role animation effect true to nature.
2. use Bézier curve according to claim 1 realizes the method for role's run trace animation, it is characterized in that, described step a, specifically comprises:
When animation modeling, it is each role animation setting key frame data;
The key frame data of setting is saved in animation path; This key frame data, comprises the rotation of object, translation, convergent-divergent and User Defined parameter.
3. use Bézier curve according to claim 1 and 2 realizes the method for role's run trace animation, it is characterized in that, described step b, specifically comprises:
The broadcasting of animation is realized by the rotation of object model, translation, convergent-divergent, object model three coordinate axis X in preserving in each animation path, the translation of Y, Z, rotation, convergent-divergent component and each passage independently use, and can combination in any to express the animation of multi-Dimensional parameters;
In key-frame animation, passage is divided into two classes: Bezier type and level-type, and corresponding preservation Bezier frame BezierKey and level frame PulseKey, each Bezier frame has reference mark, left and right, can control the change of Bezier interpolation.
4. use Bézier curve according to claim 3 realizes the method for role's run trace animation, it is characterized in that, described step c, specifically comprises:
In any t, the animation numerical result in animation path can be obtained by the Bezier section of aforementioned acquisition, to enable role animation run trace smooth excessiveness, needing to carry out interpolation to Bezier and obtaining.
5. use Bézier curve according to claim 4 realizes the method for role's run trace animation, it is characterized in that, described interpolation algorithm is as follows:
By summit P0, P1, P2, P3 define a Bezier, and wherein P (t) is the point coordinate under the t time
For any time, the Bezier value of animation is:
Concrete interpolation computing method is as follows:
First to adopting dichotomy to calculate the position judging a certain frame place Bezier in this moment between two key frames;
It is o point that the known some time is engraved in Bezier time point on curve, between two key frames, get mid point, judges the Left or right of o point at center line, and after judging, this point is positioned at the left side of first time two minutes center lines;
Then the mid point getting institute's on the left side successively judges, under normal circumstances, two key frame maximal value divide value are 32 parts and satisfy the demands, last intersection point p and q getting nearest equinoctial line adjacent with o point and key frame curve successively, get the mid point o ' of p and q point line, the value of o ' so is now approximately equal to the value of O point;
After interpolation calculation between the key frame of role animation, just can obtain role along the curved path walking of specifying, thus define role animation effect true to nature.
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