CN116468825A - Curve shearing method, curve shearing device, curve shearing equipment and storage medium - Google Patents
Curve shearing method, curve shearing device, curve shearing equipment and storage medium Download PDFInfo
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- CN116468825A CN116468825A CN202310685708.4A CN202310685708A CN116468825A CN 116468825 A CN116468825 A CN 116468825A CN 202310685708 A CN202310685708 A CN 202310685708A CN 116468825 A CN116468825 A CN 116468825A
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- 238000010008 shearing Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000003860 storage Methods 0.000 title claims abstract description 9
- 238000004590 computer program Methods 0.000 claims description 4
- 210000004761 scalp Anatomy 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 210000003128 head Anatomy 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
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Abstract
The application relates to a curve clipping method and device, equipment and storage medium. The curve shearing method comprises the following steps: acquiring a first end and a second end of a curve to be sheared, sequentially acquiring more than two query points on the curve to be sheared along the first end to the second end, wherein the curve distance between two adjacent query points on the curve to be sheared is sequentially reduced along the direction from the first end to the second end; when more than two query points are sequentially obtained, the minimum distance between the current query point and the model surface is obtained, and when the minimum distance is smaller than or equal to a preset precision parameter, the query point is a shearing point; and performing shearing treatment on the curve to be sheared by taking the shearing point as a shearing reference. Compared with the traditional method for equally dividing the curve to be sheared into a plurality of sections and obtaining shearing points by comparing distances between the curves and the surface of the model in sequence, the method has the advantages that the query points are obtained in sequence, the accuracy between the obtained query points is gradually improved, the operation times are effectively reduced, and the processing efficiency is improved.
Description
Technical Field
The present disclosure relates to the field of three-dimensional modeling technologies, and in particular, to a method and apparatus for shearing curves, a device, and a storage medium.
Background
In the process of three-dimensional animated hair production, the scalp and hair junction, i.e. the junction of the curve representing the hair and the surface of the model representing the scalp in the three-dimensional model, requires cutting off the superfluous curve. The general shearing mode is to divide the curve equally into a plurality of equal parts and then to compare the shearing precision.
However, this approach is slow in cases where a large number of curves are sheared and a high degree of accuracy is required.
Disclosure of Invention
In view of this, the present application proposes a curve clipping method and apparatus, a device and a storage medium.
According to an aspect of the present application, there is provided a curve clipping method for clipping a curve in a model in three-dimensional animation, including:
acquiring a first end and a second end of a curve to be sheared in the model, and sequentially acquiring more than two query points on the curve to be sheared along the first end to the second end;
the curve distances of two adjacent query points on the curve to be sheared are sequentially reduced along the direction from the first end to the second end;
when more than two query points are sequentially obtained, acquiring the minimum distance between the current query point and the model surface, and when the minimum distance is smaller than or equal to a preset precision parameter, the query point is a shearing point;
and taking the shearing point as a shearing reference, and conducting shearing treatment on the curve to be sheared.
In one possible implementation manner, when more than two query points are sequentially obtained on the curve to be sheared, the query points are obtained based on the minimum distance from the first end to the model surface and the minimum distance from the query points to the model surface.
In one possible implementation manner, a minimum distance between the first end and the surface of the model is obtained, and a first query point is obtained on the curve to be sheared based on the minimum distance;
acquiring the minimum distance between the first query point and the surface of the model, wherein the first query point is a shearing point when the minimum distance is smaller than or equal to the preset precision parameter;
and when the minimum distance between the first query point and the model surface is larger than the preset precision parameter, acquiring the next query point on the curve to be sheared based on the minimum distance between the query point and the model surface until the acquired minimum distance between the query point and the model surface is smaller than or equal to the preset precision parameter.
In one possible implementation manner, when the minimum distance between the query point and the model surface is greater than the preset precision parameter, the curve distance between the next query point and the query point on the curve is equal to the minimum distance between the query point and the model surface when the next query point is acquired.
In one possible implementation, the method further comprises acquiring more than two shearing points based on more than two model surfaces when the curve to be sheared passes through more than two model surfaces.
According to another aspect of the present application, there is provided a curved shearing device comprising: acquiring a query point module and a shearing module;
the query point acquisition module is configured to acquire a first end and a second end of a curve to be sheared in the model, and sequentially acquire more than two query points on the curve to be sheared along the first end to the second end; the curve distances of two adjacent query points on the curve to be sheared are sequentially reduced along the direction from the first end to the second end; when more than two query points are sequentially obtained, acquiring the minimum distance between the current query point and the model surface, and when the minimum distance is smaller than or equal to a preset precision parameter, the query point is a shearing point;
and the shearing module is configured to conduct shearing treatment on the curve to be sheared by taking the shearing point as a shearing reference.
According to another aspect of the present application, there is provided a curved shearing apparatus comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to implement any of the methods described above when executing the executable instructions.
According to another aspect of the present application there is provided a non-transitory computer readable storage medium having stored thereon computer program instructions, characterized in that the computer program instructions when executed by a processor implement the method of any of the above.
The method is suitable for shearing curves passing through the surface of a model in three-dimensional modeling, wherein the model, namely the three-dimensional model, is a polygonal surface of an object, such as a solid model used for representing a head in three-dimensional animation production, a scalp part, namely a part of the surface of the model, is used for representing hair, the shape trend of the model needs to be controlled according to respective guide lines, namely the curves, and therefore, in the process of producing the three-dimensional animation hair, a large number of curves are penetrated at the boundary between the scalp and the hair, namely the surface of the model, and redundant parts of the curves need to be sheared, and only the guide lines used for representing hair outside the scalp are reserved. Acquiring a first end and a second end of a curve to be sheared, sequentially acquiring more than two query points on the curve to be sheared along the first end to the second end based on the first end, wherein the first end and the second end are respectively opposite two ends of the curve to be sheared, any one end of the curve to be sheared can be selected as the first end by a person skilled in the art according to personal preference or actual conditions, curve distances between two adjacent query points on the curve to be sheared are sequentially reduced along the direction from the first end to the second end, namely, the more than two query points sequentially acquired on the curve to be sheared are gradually close to the surface of a model, and the minimum distance between the two adjacent query points is gradually reduced. When more than two query points are sequentially obtained, the minimum distance between the current query point and the surface of the model is obtained, when the minimum distance is smaller than or equal to a preset precision parameter, the query point is a shearing point, and according to the actual situation, the curve to be sheared is sheared by taking the shearing point as a reference, namely, the shearing point of the curve to be sheared is sheared to a second end part or a first end part. Compared with the traditional method for equally dividing the curve to be sheared into a plurality of sections and obtaining shearing points by comparing distances between the curves and the surface of the model in sequence, the method has the advantages that the query points are obtained in sequence, the accuracy between the obtained query points is gradually improved, the operation times are effectively reduced, and the processing efficiency is improved.
Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the present application and together with the description, serve to explain the principles of the present application.
FIG. 1 shows a flow chart of a curve clipping method of an embodiment of the present application;
FIG. 2 shows a schematic diagram of a curvilinear clipping method implementation of an embodiment of the present application;
FIG. 3 shows a schematic of a curve to be sheared across two or more model surfaces;
FIG. 4 shows a schematic diagram of the implementation of the curve shearing method of the embodiments of the present application when the curve to be sheared passes through more than two model surfaces;
FIG. 5 shows a main block diagram of a curved shearing device according to an embodiment of the present application;
fig. 6 shows a main body structure diagram of a curve shearing apparatus of an embodiment of the present application.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following detailed description in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.
For the convenience of understanding the technical solutions of the present application, corresponding explanation is first made on terms in the present application.
Fig. 1 shows a flow chart of a curve clipping method of an embodiment of the present application. As shown in fig. 1, the curve clipping method includes: step S100: acquiring a first end and a second end of a curve to be sheared, sequentially acquiring more than two query points on the curve to be sheared along the first end to the second end, wherein the curve distance between two adjacent query points on the curve to be sheared is sequentially reduced along the direction from the first end to the second end; step S200: when more than two query points are sequentially obtained, the minimum distance between the current query point and the model surface is obtained, and when the minimum distance is smaller than or equal to a preset precision parameter, the query point is a shearing point; step S300: and performing shearing treatment on the curve to be sheared by taking the shearing point as a shearing reference.
The method is suitable for shearing curves passing through the surface of a model in three-dimensional modeling, wherein the model, namely the three-dimensional model, is a polygonal surface of an object, such as a solid model used for representing a head in three-dimensional animation production, a scalp part, namely a part of the surface of the model, is used for representing hair, the shape trend of the model needs to be controlled according to respective guide lines, namely the curves, and therefore, in the process of producing the three-dimensional animation hair, a large number of curves are penetrated at the boundary between the scalp and the hair, namely the surface of the model, and redundant parts of the curves need to be sheared, and only the guide lines used for representing hair outside the scalp are reserved. Acquiring a first end and a second end of a curve to be sheared, sequentially acquiring more than two query points on the curve to be sheared along the first end to the second end based on the first end, wherein the first end and the second end are respectively opposite two ends of the curve to be sheared, any one end of the curve to be sheared can be selected as the first end by a person skilled in the art according to personal preference or actual conditions, curve distances between two adjacent query points on the curve to be sheared are sequentially reduced along the direction from the first end to the second end, namely, the more than two query points sequentially acquired on the curve to be sheared are gradually close to the surface of a model, and the distances between the two adjacent query points are gradually reduced. When more than two query points are sequentially obtained, the minimum distance between the current query point and the surface of the model is obtained, when the minimum distance is smaller than or equal to a preset precision parameter, the query point is a shearing point, and according to the actual situation, the curve to be sheared is sheared by taking the shearing point as a reference, namely, the shearing point of the curve to be sheared is sheared to a second end part or a first end part. Compared with the traditional method for equally dividing the curve to be sheared into a plurality of sections and obtaining shearing points by comparing distances between the curves and the surface of the model in sequence, the method has the advantages that the query points are obtained in sequence, the accuracy between the obtained query points is gradually improved, the operation times are effectively reduced, and the processing efficiency is improved.
When more than two query points are sequentially obtained on the curve to be sheared, the method is obtained based on the minimum distance from the first end to the model surface and the minimum distance from the query point to the model surface. The minimum distance from the first end to the model surface is the shortest distance from the point representing the first end on the curve to be sheared to all points on the model surface, and the minimum distance from the query point to the model surface is the shortest distance from the point representing the query point on the curve to be sheared to all points on the model surface.
Further, obtaining the minimum distance from the first end to the surface of the model, and obtaining a first query point on the curve to be sheared based on the distance; acquiring the minimum distance between the first query point and the surface of the model, wherein the first query point is a shearing point when the minimum distance is smaller than or equal to a preset precision parameter; when the minimum distance between the first query point and the model surface is larger than the preset precision parameter, acquiring the next query point on the curve to be sheared based on the minimum distance between the query point and the model surface until the minimum distance between the acquired query point and the model surface is smaller than or equal to the preset precision parameter.
When a minimum distance between a first end and a model surface is acquired, a first query point is acquired on a curve to be sheared based on the distance, the first end is taken as a starting point, and a point with the length equal to the minimum distance between the first end and the first end on the curve to be sheared is acquired as the first query point.
Similarly, when the minimum distance between the first query point and the model surface is larger than the preset precision parameter, based on the minimum distance between the query point and the model surface, when the next query point is acquired on the curve to be sheared, the first query point is taken as a starting point, and a point with the length equal to the minimum distance between the first query point and the first query point on the curve to be sheared is acquired as the next query point.
When judging whether the minimum distance between the first end or the query point and the model surface is smaller than or equal to a preset precision parameter, the method can be used for judging whether the minimum distance between the first end or the query point and the model surface is smaller than or equal to the preset precision parameter or not by the following steps:
the deduction judgment formula is as follows:
p1: the location of points on the curve
P2: p1 position of closest point to model
P1=(x1,y1,z1)
P2=(x2,y2,z2)
ɤ the accuracy parameter
Minimum distance between the first end or query point and the model surface =<= ɤ
By using the method, the query points are sequentially acquired on the curve to be sheared until the minimum distance between the acquired query points and the surface of the model is smaller than or equal to a preset precision parameter, and the query points are used as shearing points.
For example, fig. 2 shows a schematic implementation diagram of a curve clipping method according to an embodiment of the present application, as shown in fig. 2, a model surface is on the left side, a point a is designated as a first end of a curve to be clipped, a minimum distance between the point a and the model surface is obtained, the distance is 3.735527, the minimum distance is greater than a preset precision parameter, and a point a is taken as a starting point, and a length 3.735527 is moved to a second end on the curve to be clipped, so as to obtain a point B as a first query point. And acquiring the minimum distance between the point B and the surface of the model, wherein the minimum distance is 1.074505, and the minimum distance is larger than a preset precision parameter, and moving the length 1.074505 to the second end on the curve to be sheared by taking the point B as a starting point to obtain a point C as the next query point. And acquiring the minimum distance between the point C and the surface of the model, wherein the minimum distance is 0.419809, and the minimum distance is larger than a preset precision parameter, and taking the point C as a starting point, moving the length 0.419809 to the second end on the curve to be sheared, and taking the obtained point as the next query point. And the like until the minimum distance between the obtained query point and the model surface is smaller than or equal to a preset precision parameter, wherein the preset precision parameter is 0.009, and when the minimum distance between the query point and the model surface is smaller than or equal to 0.009, the query point is taken as a shearing point which is approximately the intersection point between the curve and the model.
In an actual use scenario, when the curve to be sheared passes through more than two model surfaces, as shown in fig. 3, the curve to be sheared needs to be sheared for a plurality of times, so that the application further comprises obtaining more than two shearing points based on more than two model surfaces when the curve to be sheared passes through more than two model surfaces.
Further, by using any one of the above methods, based on two or more model surfaces, two or more shearing points are respectively obtained on the curve to be sheared, and the curve to be sheared is sheared based on the two or more shearing points.
That is, a first end and a second end of the curve to be sheared are obtained, a minimum distance from the first end to the first model surface is obtained, and a first query point is obtained on the curve to be sheared based on the distance; acquiring the minimum distance between the first query point and the surface of the model, wherein the first query point is a shearing point when the distance is smaller than or equal to a preset precision parameter; when the minimum distance between the first query point and the model surface is greater than the preset precision parameter, acquiring the next query point on the curve to be sheared based on the minimum distance between the query point and the model surface until the minimum distance between the acquired query point and the first model surface is less than or equal to the preset precision parameter, wherein the query point is used as a first shearing point corresponding to the first model surface.
Further, by using the method, a second shearing point corresponding to the second model surface is obtained, and the like, each shearing point corresponding to each model surface is obtained in turn.
Taking fig. 4 as an example, the curve to be sheared sequentially passes through more than two model surfaces, the left end point of the curve to be sheared is taken as a first end, a first shearing point corresponding to the first model surface, namely a point D, is obtained by utilizing any one of the methods, then a second shearing point corresponding to the second model surface, namely a point E, is obtained by utilizing any one of the methods based on the first end and the second model surface, and the third model surface, the fourth model surface, the fifth model surface and the sixth model surface are respectively obtained by analogy, namely a point F, a point G, a point H and a point I. After each shearing point is obtained, based on the first end, the second end and each shearing point according to the actual use requirement, the curve to be sheared is sheared, namely, shearing and deleting are carried out on the first end to point D part, the point D to point E part, the point E to point F part, the point F to point G part, the point G to point H part, the point H to point I part and the point I to the second end part according to the actual use requirement, or the part needing shearing is customized, such as integral shearing and deleting are carried out on the point D to the second end part.
The method is suitable for shearing the curve to be sheared when the curve to be sheared is intersected with more than two regular model surfaces, namely, the two model surfaces intersected with the curve to be sheared are not intersected, or an intersecting line exists between the two connected model surfaces, the model surfaces can be divided based on the intersecting line, for example, in the method, the first model surface to the sixth model surface are divided based on the intersecting line, and the more than two model surfaces divided based on the intersecting line of the curve to be sheared respectively obtain more than two corresponding shearing points.
Further, when the curve to be sheared and the irregular continuous curved surface intersect twice or more, for example, the curve to be sheared penetrates through the sphere model, two intersecting points of the surface of the sphere model of the curve to be sheared, namely, two shearing points are required to be obtained, and because the surface of the sphere model is a continuous curve, only one shearing point can be obtained by the method based on the minimum distance between the first end and the surface of the model.
Specifically, a shearing area is defined on the surface of the model in an artificial designated manner, when the shearing area is designated manually, one shearing area only comprises one intersection point of a curve to be sheared and the surface of the model, when the curve to be sheared is intersected with more than two places of the surface of the model, the shearing areas are defined based on the intersection points of the two or more places, by utilizing any of the methods, the shearing points of the curve to be sheared in the shearing area are obtained based on the minimum distance between the first end of the curve to be sheared and the current shearing area, therefore, the shearing points corresponding to the shearing areas are sequentially obtained, and according to practical conditions, the part to be sheared is customized based on the first end and the second end of the curve to be sheared and the shearing points.
Still further referring to fig. 5, according to another aspect of the present application, there is also provided a curved shearing device 100, including: a query point module 110 and a shear module 120 are obtained; the query point acquisition module is configured to acquire a first end and a second end of a curve to be sheared, and sequentially acquire more than two query points on the curve to be sheared along the first end to the second end; the curve distance between two adjacent query points on the curve to be sheared is sequentially reduced along the direction from the first end to the second end; when more than two query points are obtained in sequence, the minimum distance between the current query point and the model surface is obtained, and when the minimum distance is smaller than or equal to a preset precision parameter, the query point is a shearing point. And the shearing module is configured to conduct shearing treatment on the curve to be sheared by taking the shearing point as a shearing reference.
Still further in accordance with another aspect of the present application, a curvilinear shearing apparatus 200 is provided. Referring to fig. 6, a curve clipping device 200 according to an embodiment of the present application includes a processor 210 and a memory 220 for storing instructions executable by the processor 210. Wherein the processor 210 is configured to implement any of the curve clipping methods described above when executing the executable instructions.
Here, it should be noted that the number of processors 210 may be one or more. Meanwhile, in the external reference calibration apparatus 200 for an image according to the embodiment of the present application, an input device 230 and an output device 240 may be further included. The processor 210, the memory 220, the input device 230, and the output device 240 may be connected by a bus, or may be connected by other means, which is not specifically limited herein.
The memory 220 is a computer-readable storage medium that can be used to store software programs, computer-executable programs, and various modules, such as: the curve clipping method in the embodiment of the application corresponds to a program or a module. The processor 210 performs various functional applications and data processing of the curve clipping device 200 by running software programs or modules stored in the memory 220.
The input device 230 may be used to receive an input digital or signal. Wherein the signal may be a key signal generated in connection with user settings of the device/terminal/server and function control. The output means 240 may comprise a display device such as a display screen.
According to another aspect of the present application, there is also provided a non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by the processor 210, implement any of the curve clipping methods described in the foregoing.
The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. A curve clipping method for clipping a curve in a model in three-dimensional animation, comprising:
acquiring a first end and a second end of a curve to be sheared in the model, and sequentially acquiring more than two query points on the curve to be sheared along the first end to the second end;
the curve distances of two adjacent query points on the curve to be sheared are sequentially reduced along the direction from the first end to the second end;
when more than two query points are sequentially obtained, acquiring the minimum distance between the current query point and the model surface, and when the minimum distance is smaller than or equal to a preset precision parameter, the query point is a shearing point;
and taking the shearing point as a shearing reference, and conducting shearing treatment on the curve to be sheared.
2. The method of claim 1, wherein when two or more of the query points are sequentially obtained on the curve to be sheared, the query points are obtained based on a minimum distance from the first end to the model surface and a minimum distance from the query point to the model surface.
3. The method of claim 2, wherein a minimum distance from the first end to the model surface is obtained, and a first one of the query points is obtained on the curve to be sheared based on the minimum distance;
acquiring the minimum distance between the first query point and the surface of the model, wherein the first query point is a shearing point when the minimum distance is smaller than or equal to the preset precision parameter;
and when the minimum distance between the first query point and the model surface is larger than the preset precision parameter, acquiring the next query point on the curve to be sheared based on the minimum distance between the query point and the model surface until the acquired minimum distance between the query point and the model surface is smaller than or equal to the preset precision parameter.
4. A method according to claim 3, wherein when the minimum distance between the query point and the model surface is greater than the preset accuracy parameter, the curve distance between the next query point and the query point on the curve is equal to the minimum distance between the query point and the model surface when the next query point is acquired.
5. The method of any one of claims 1 to 4, further comprising acquiring two or more of the shear points based on two or more of the model surfaces as the curve to be sheared passes through the two or more model surfaces.
6. A curvilinear shearing device, comprising: acquiring a query point module and a shearing module;
the query point acquisition module is configured to acquire a first end and a second end of a curve to be sheared in the model, and sequentially acquire more than two query points on the curve to be sheared along the first end to the second end; the curve distances of two adjacent query points on the curve to be sheared are sequentially reduced along the direction from the first end to the second end; when more than two query points are sequentially obtained, acquiring the minimum distance between the current query point and the model surface, and when the minimum distance is smaller than or equal to a preset precision parameter, the query point is a shearing point;
and the shearing module is configured to conduct shearing treatment on the curve to be sheared by taking the shearing point as a shearing reference.
7. A curved shearing apparatus, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to implement the method of any one of claims 1 to 5 when executing the executable instructions.
8. A non-transitory computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the method of any of claims 1 to 5.
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