CN108734760A - Three-dimensional grid lines stretch system and three-dimensional grid lines stretch method - Google Patents
Three-dimensional grid lines stretch system and three-dimensional grid lines stretch method Download PDFInfo
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- CN108734760A CN108734760A CN201710818070.1A CN201710818070A CN108734760A CN 108734760 A CN108734760 A CN 108734760A CN 201710818070 A CN201710818070 A CN 201710818070A CN 108734760 A CN108734760 A CN 108734760A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
Abstract
System is stretched the present invention relates to three-dimensional grid lines and three-dimensional grid lines stretch method, and the three-dimensional grid lines stretch system and include：Cut surface builds module, the termination triangular facet where hypothesis starting triangular facet and terminal where the starting point of the selected lines for needing to stretch assumes that originating triangular facet and the method for average phase, the starting point and the terminal for terminating triangular facet builds cut surface using described；Target originates triangular facet and target termination triangular facet determining module, judge to assume starting triangular facet and whether in one plane to terminate triangular facet, if in one plane, it is respectively that target originates triangular facet and target termination triangular facet, and starting point, terminal and target are originated to three vertex progress rasterizing of triangular facet and target termination triangular facet then to determine hypothesis starting triangular facet and terminate triangular facet；Flattening operations module, intersection point, that is, cut point that the cut surface and the target are originated to triangular facet are adsorbed onto by the straight line of the starting point and the terminal.
Description
Technical field
Stretch system the present invention relates to three-dimensional grid wall line and three-dimensional grid lines stretch method, more particularly, to suitable for
As the three-dimensional grid lines of corner, eaves, the rule building of window etc. locally modified stretch system and the drawing of three-dimensional grid lines
Histogram method.
Background technology
With the development of photogrammetric technology, it now is possible to easily by taking photo by plane data for large-scale landform
Object carries out automatized three-dimensional modeling.However, precision, block etc. due to, obtained threedimensional model is more or less in detail
Some defects, such as pavement roughness, building detail feature entanglement etc..Therefore, it for these threedimensional models, generally requires to carry out
Later stage grid is modified, with correction, Optimized model.
The case where for needing part modification, will directly need the coordinate fitting of the mesh point of part modified to a certain three
Edged surface (such as ground) is then directed to modified part and is manually modeled again using modeling software progress, then will on this basis
The model built up is placed on triangular facet and is replaced.But this method is to modify defect by blocking for vision, not
Original mesh data are deleted, with the progress of modification, data can become increasing.Meanwhile the triangular facet fitting of bulk region
Faying surface is will produce, there may be the problem of flicker in display；And the optimization of some small details is inconvenient, can cause whole
The modification of a building, time and effort consuming.
Invention content
System is stretched the object of the present invention is to provide a kind of three-dimensional grid lines and three-dimensional grid lines stretch method,
Common edge straight line is generated by the way of directly modification original mesh local data, is suitable for the part modification of rule building.
To achieve the goals above, three-dimensional grid lines of the invention stretch system and include：Cut surface builds module, selectes
Hypothesis where needing the starting point of the lines stretched originates the termination triangular facet where triangular facet and terminal, is assumed using described
Beginning triangular facet and the method for average phase, the starting point and the terminal for terminating triangular facet build cut surface；Target originates triangle
Face and target termination triangular facet determining module judge whether the hypothesis starting triangular facet is flat at one with the termination triangular facet
On face, if in one plane, it is determined that the hypothesis originates triangular facet and the termination triangular facet is respectively target starting three
Edged surface and target termination triangular facet, and the starting point, the terminal and the target are originated into triangular facet and target end
Only three vertex of triangular facet carry out rasterizing；The cut surface and the target are originated triangular facet by flattening operations module
Intersection point, that is, cut point is adsorbed onto by the straight line of the starting point and the terminal.
An embodiment according to the present invention originates triangular facet and target termination triangular facet determining module in the target, if
It is judged as that the hypothesis starting triangular facet and the termination triangular facet in one plane, then do not calculate the hypothesis starting triangle
The first intersection point of face and the cut surface between the starting point and the terminal, and judge first intersection point whether in broken hole
On, if being judged as not on broken hole, the neighbour on side where sharing the intersection point with the starting triangular facet is obtained by syntople
First intersection point is set as new starting point by junction, and the adjacent surface is set as new hypothesis starting triangular facet, again described in judgement
It is assumed that whether starting triangular facet and the termination triangular facet are in one plane until the hypothesis originates triangular facet and the end
Only triangular facet becomes approximately the same plane.
An embodiment according to the present invention originates triangular facet and target termination triangular facet determining module in the target, if
It is judged as first intersection point on broken hole, then calculates the broken hole and the cut surface between first intersection point and terminal
The second intersection point, second intersection point is updated to new starting point, the triangular facet where second intersection point is set as new vacation
Surely triangular facet is originated, judges the hypothesis starting triangular facet with the termination triangular facet whether in one plane until institute again
Stating hypothesis starting triangular facet and the termination triangular facet becomes approximately the same plane.
In the present invention as stated above, further include new triangular facet structure module, triangular facet and target termination triangle are originated by target
After face determining module determines target starting triangular facet and target termination triangular facet, using the cut point as new vertex, more
All vertex index of the cut surface newly cut by the cut surface, again using each vertex in all vertex index
New triangular facet is constructed, and texture is assigned to new triangular facet.
In the present invention as stated above, further include optimization module, by all of its neighbor triangle of all new triangular facet and cut surface
Face after both sides classification to the left and right, is carried out smooth respectively on the basis of the cut surface.
To achieve the goals above, three-dimensional grid lines of the invention stretch method and include：Cut surface construction step is selected
Hypothesis where needing the starting point of the lines stretched originates the termination triangular facet where triangular facet and terminal, is assumed using described
Beginning triangular facet and the method for average phase, the starting point and the terminal for terminating triangular facet build cut surface；Target originates triangle
Face and target termination triangular facet determine step, judge whether the hypothesis starting triangular facet is flat at one with the termination triangular facet
On face, if in one plane, it is determined that the hypothesis originates triangular facet and the termination triangular facet is respectively target starting three
Edged surface and target termination triangular facet, and the starting point, the terminal and the target are originated into triangular facet and target end
Only three vertex of triangular facet carry out rasterizing；The cut surface and the target are originated triangular facet by flattening operations step
Intersection point, that is, cut point is adsorbed onto by the straight line of the starting point and the terminal.
An embodiment according to the present invention originates triangular facet in the target and target termination triangular facet determines step, if
It is judged as that the hypothesis starting triangular facet and the termination triangular facet in one plane, then do not calculate the hypothesis starting triangle
The first intersection point of face and the cut surface between the starting point and the terminal, and judge first intersection point whether in broken hole
On, if being judged as not on broken hole, the neighbour on side where sharing the intersection point with the starting triangular facet is obtained by syntople
First intersection point is set as new starting point by junction, and the adjacent surface is set as new hypothesis starting triangular facet, again described in judgement
It is assumed that whether starting triangular facet and the termination triangular facet are in one plane until the hypothesis originates triangular facet and the end
Only triangular facet becomes approximately the same plane.
An embodiment according to the present invention originates triangular facet in the target and target termination triangular facet determines step, if
It is judged as first intersection point on broken hole, then calculates the broken hole and the cut surface between first intersection point and terminal
The second intersection point, second intersection point is updated to new starting point, the triangular facet where second intersection point is set as new vacation
Surely triangular facet is originated, judges the hypothesis starting triangular facet with the termination triangular facet whether in one plane until institute again
Stating hypothesis starting triangular facet and the termination triangular facet becomes approximately the same plane.
In the present invention as stated above, it originates triangular facet in target and target termination triangular facet determines that step determines that target originates triangle
Further include that the new triangular facet step of structure updates quilt using the cut point as new vertex after face and target termination triangular facet
All vertex index for the cut surface that the cut surface is cut are constructed again using each vertex in all vertex index
New triangular facet, and assign texture to new triangular facet.
An embodiment according to the present invention, by all of its neighbor triangular facet of all new triangular facet and cut surface with described
On the basis of cut surface after both sides classification to the left and right, carry out respectively smooth.
The three-dimensional grid lines of the present invention stretch system and three-dimensional grid lines stretch method, can be used for rule building
Local feature reparation, such as fluctuating, dislocation etc. for repairing the positions such as corner, eaves can be also used for any required direct
The scene of common edge straight line is formed by dividing triangular facet in original mesh data.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below to required in specific embodiment part
The attached drawing used does simple introduction, it is therefore apparent that drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without creative efforts, others are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is that the three-dimensional grid lines of one embodiment of the present invention stretch the block diagram of system.
Fig. 2 is that the three-dimensional grid lines of another embodiment of the present invention stretch the block diagram of system.
Fig. 3 is that the three-dimensional grid lines of another embodiment of the present invention stretch the block diagram of system.
Fig. 4 is that the three-dimensional grid wall line of one embodiment of the present invention stretches the flow chart of method.
Fig. 5 is the flow chart for the process that the three-dimensional grid wall line of the present invention stretches the cutting calculations of method.
Fig. 6 is that the three-dimensional grid wall line of another embodiment of the present invention stretches the flow chart of method.
Fig. 7 is that the three-dimensional grid wall line of another embodiment of the present invention stretches the flow chart of method.
Specific implementation mode
In the following, illustrating the embodiment of the present invention in greater detail with reference to the attached drawings.The embodiment of the present invention can be deformed into various
Mode, the scope of the present invention should not be construed as limited to examples set forth below.
In the following, the three-dimensional grid lines that the present invention will be described in detail referring to Fig.1 stretch the composition of system.Fig. 1 is to indicate this hair
The three-dimensional grid lines of a bright embodiment stretch the block diagram of system.
As shown in Figure 1, it includes cut surface structure module 110, mesh that the three-dimensional grid lines of the present invention, which stretch system 100 mainly,
Mark starting triangular facet and target termination triangular facet determining module 120 and flattening operations module 130.
Specifically, the hypothesis where the starting point for the lines that the cut surface structure module 110 is stretched for selected needs rises
Termination triangular facet where beginning triangular facet and terminal assumes to originate triangular facet and the method for average for terminating triangular facet using described
Phase, the starting point and the terminal build cut surface.It should be noted that the cut surface not necessarily also need not be perpendicular to institute
State hypothesis starting triangular facet and the termination triangular facet.
The target starting triangular facet and target termination triangular facet determining module 120 are for judging the hypothesis starting triangle
Face and the terminations triangular facet whether in one plane, if in one plane, it is determined that the hypothesis originate triangular facet and
The termination triangular facet is respectively target starting triangular facet and target termination triangular facet, and by the starting point, the terminal and
Three vertex of the target starting triangular facet and the target termination triangular facet carry out rasterizing.The flattening operations module
130 for being adsorbed onto intersection point, that is, cut points of the cut surface and target starting triangular facet by the starting point and described
On the straight line of terminal.
In addition, triangular facet and target termination triangular facet determining module 120 are originated in the target, if being judged as the hypothesis
It originates triangular facet and the terminations triangular facet not in one plane, then calculates hypothesiss and originate triangular facet and the cut surface
The first intersection point between the starting point and the terminal, and judge first intersection point whether on broken hole.If illustrating,
First intersection point is the cut surface and intersection point close from terminal in the intersection point of the triangle edges for assuming starting triangular facet.
If here, being judged as not on broken hole, side where sharing the intersection point with the starting triangular facet is obtained by syntople
First intersection point is set as new starting point by adjacent surface, and the adjacent surface is set as new hypothesis starting triangular facet, judges institute again
Hypothesis starting triangular facet and the termination triangular facet are stated whether in one plane until hypothesis starting triangular facet and described
Terminating triangular facet becomes approximately the same plane.
Further, triangular facet and target termination triangular facet determining module 120 are originated in the target, if being judged as described the
One intersection point then calculates the second intersection point of the broken hole and the cut surface between first intersection point and terminal on broken hole,
Second intersection point is updated to new starting point, the triangular facet where second intersection point, which is set as new hypothesis, originates triangle
Whether face judges the hypothesis starting triangular facet with the termination triangular facet in one plane until the hypothesis originates again
Triangular facet and the termination triangular facet become approximately the same plane.
Fig. 2 is that the three-dimensional grid lines of another embodiment of the present invention stretch the block diagram of system.As shown in Fig. 2, this hair
It further includes new triangular facet structure module 140 that bright three-dimensional grid lines, which stretch system, which passes through mesh
It, will after mark starting triangular facet and target termination triangular facet determining module determine target starting triangular facet and target termination triangular facet
The cut point updates all vertex index of the cut surface cut by the cut surface, utilizes this as new vertex
New triangular facet is constructed on each vertex in all vertex index again, and assigns texture to new triangular facet.
Fig. 3 is that the three-dimensional grid lines of another embodiment of the present invention stretch the block diagram of system.As shown in figure 3, this hair
It further includes optimization module 150 that bright three-dimensional grid lines, which stretch system, and the optimization module 150 is by all new triangular facets and is cut
The all of its neighbor triangular facet of face after both sides classification to the left and right, is carried out smooth respectively on the basis of the cut surface.
In the following, the course of work that three-dimensional grid lines stretch system is described in detail with reference to Fig. 4 and Fig. 5.Fig. 4 is of the invention
Three-dimensional grid wall line stretches the flow chart of method；Fig. 5 is the mistake that the three-dimensional grid wall line of the present invention stretches the cutting calculations of method
The flow chart of journey.
As shown in figure 4, first, the vacation where cut surface construction step S100, the starting point of the selected lines for needing to stretch
Surely triangular facet and the termination triangular facet where terminal are originated, assumes to originate triangular facet using described and described terminates the flat of triangular facet
Equal method phase, the starting point and the terminal build cut surface.Then, it originates triangular facet in target and target termination triangular facet determines
Whether in one plane step S200 judges the hypothesis starting triangular facet and the termination triangular facet, if in a plane
On, it is determined that the hypothesis originates triangular facet and the termination triangular facet is respectively target starting triangular facet and target termination triangle
Face, and the starting point, the terminal and the target are originated to three vertex of triangular facet and the target termination triangular facet
Carry out rasterizing.Finally, in flattening operations step 300, the intersection point that the cut surface is originated to triangular facet with the target is cut
Cutpoint is adsorbed onto by the straight line of the starting point and the terminal.
As shown in figure 5, step 200 is determined in target starting triangular facet and target termination triangular facet, if being judged as institute
State hypothesis starting triangular facet and assume the terminations triangular facet not in one plane, then calculate hypothesiss originate triangular facet and
First intersection point of the cut surface between the starting point and the terminal, and first intersection point is judged whether on broken hole,
If being judged as not on broken hole, the adjoining on side where sharing the intersection point with the starting triangular facet is obtained by syntople
First intersection point is set as new starting point by face, and the adjacent surface is set as new hypothesis starting triangular facet, judges the vacation again
Surely whether starting triangular facet and the termination triangular facet are in one plane until the hypothesis originates triangular facet and the termination
Triangular facet becomes approximately the same plane (S210).Further, it originates triangular facet in the target and target termination triangular facet determines step
Rapid S200 calculates the broken hole with the cut surface in first intersection point if being judged as first intersection point on broken hole
Second intersection point is updated to new starting point by the second intersection point between terminal, by the triangular facet where second intersection point
It is set as new hypothesis starting triangular facet, judges whether the hypothesis starting triangular facet is flat at one with the termination triangular facet again
Become approximately the same plane (S220) until the hypothesis originates triangular facet and the termination triangular facet on face.
In addition, Fig. 6, which is the three-dimensional grid wall line of another embodiment of the present invention, stretches the flow chart of method；Fig. 7 is this
The three-dimensional grid wall line of another embodiment of invention stretches the flow chart of method.
As shown in fig. 6, determining that step S200 determines target starting three in target starting triangular facet and target termination triangular facet
Further include the new triangular facet step S400 of structure after edged surface and target termination triangular facet.In the new triangular facet step S400 of the structure
In, using the cut point as new vertex, update all vertex index of the cut surface cut by the cut surface, profit
New triangular facet is constructed again with each vertex in all vertex index, and assigns texture to new triangular facet.
Further include Optimization Steps S500, by institute in addition, as shown in fig. 7, it is preferred that after building new triangular facet step S400
The all of its neighbor triangular facet of the new triangular facet and cut surface that have after both sides classification to the left and right, is distinguished on the basis of the cut surface
It carries out smooth.
As described above, the three-dimensional grid lines of the present invention stretch method, it can be used for the local feature reparation of rule building,
Such as fluctuating, dislocation etc. for repairing the positions such as corner, eaves, any need is can be also used for directly in original mesh data
The upper scene that common edge straight line is formed by dividing triangular facet.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Any modification, equivalent substitution, improvement and etc. done within principle, should be included within the scope of protection of the invention.
Claims (10)
1. a kind of three-dimensional grid lines stretch system, which is characterized in that including：
Cut surface builds module, the end where hypothesis starting triangular facet and terminal where the starting point of the selected lines for needing to stretch
Only triangular facet assumes to originate triangular facet and method of average phase, the starting point and the terminal for terminating triangular facet using described
Build cut surface；
Target originates triangular facet and target termination triangular facet determining module, judges that the hypothesis starting triangular facet terminates three with described
Edged surface whether in one plane, if in one plane, it is determined that hypothesis starting triangular facet and the termination triangular facet
Respectively target starting triangular facet and target termination triangular facet, and the starting point, the terminal and the target are originated three
Three vertex of edged surface and the target termination triangular facet carry out rasterizing；
Flattening operations module, intersection point, that is, cut point that the cut surface is originated to triangular facet with the target are adsorbed onto by described
On the straight line of starting point and the terminal.
2. three-dimensional grid lines according to claim 1 stretch system, which is characterized in that
Originate triangular facet and target termination triangular facet determining module in the target, if be judged as the hypothesiss starting triangular facet and
The termination triangular facet not in one plane, then calculate the hypothesis starting triangular facet and the cut surface in the starting point and
The first intersection point between the terminal, and first intersection point is judged whether on broken hole, if being judged as not on broken hole, leading to
It crosses syntople and obtains the adjacent surface for sharing first intersection point place side with the starting triangular facet, first intersection point is set as
New starting point, the adjacent surface are set as new hypothesis starting triangular facet, judge the hypothesis starting triangular facet and the end again
Only whether triangular facet in one plane becomes approximately the same plane until the hypothesis originates triangular facet and the termination triangular facet.
3. three-dimensional grid lines according to claim 2 stretch system, which is characterized in that
Triangular facet and target termination triangular facet determining module are originated in the target, if being judged as first intersection point in broken hole
On, then the second intersection point of the broken hole and the cut surface between first intersection point and terminal is calculated, described second is handed over
Point is updated to new starting point, and the triangular facet where second intersection point, which is set as new hypothesis, originates triangular facet, judges institute again
Hypothesis starting triangular facet and the termination triangular facet are stated whether in one plane until hypothesis starting triangular facet and described
Terminating triangular facet becomes approximately the same plane.
4. three-dimensional grid lines described in any one of claim 1 to 3 stretch system, which is characterized in that
Further include new triangular facet structure module, triangular facet is originated by target and target termination triangular facet determining module determines target
After originating triangular facet and target termination triangular facet, using the cut point as new vertex, update is cut by the cut surface
All vertex index of the cut surface cut construct new triangular facet again using each vertex in all vertex index, and right
New triangular facet assigns texture.
5. three-dimensional grid wall line according to claim 4 stretches system, which is characterized in that
Further include optimization module, by all of its neighbor triangular facet of all new triangular facet and cut surface using the cut surface as base
After the accurate classification of both sides to the left and right, carry out respectively smooth.
6. a kind of three-dimensional grid lines stretch method, which is characterized in that including：
Cut surface construction step, the end where hypothesis starting triangular facet and terminal where the starting point of the selected lines for needing to stretch
Only triangular facet assumes to originate triangular facet and method of average phase, the starting point and the terminal for terminating triangular facet using described
Build cut surface；
Target originates triangular facet and target termination triangular facet determines step, judges that the hypothesis starting triangular facet terminates three with described
Edged surface whether in one plane, if in one plane, it is determined that hypothesis starting triangular facet and the termination triangular facet
Respectively target starting triangular facet and target termination triangular facet, and the starting point, the terminal and the target are originated three
Three vertex of edged surface and the target termination triangular facet carry out rasterizing；
Flattening operations step, intersection point, that is, cut point that the cut surface is originated to triangular facet with the target are adsorbed onto by described
On the straight line of starting point and the terminal.
7. three-dimensional grid lines according to claim 6 stretch method, which is characterized in that
Originate triangular facet and target termination triangular facet in the target and determine step, if be judged as the hypothesiss starting triangular facet and
The termination triangular facet not in one plane, then calculate the hypothesis starting triangular facet and the cut surface in the starting point and
The first intersection point between the terminal, and first intersection point is judged whether on broken hole, if being judged as not on broken hole, leading to
It crosses syntople and obtains the adjacent surface for sharing intersection point place side with the starting triangular facet, first intersection point is set as new
Starting point, the adjacent surface are set as new hypothesis starting triangular facet, judge that the hypothesis starting triangular facet terminates three with described again
Whether edged surface in one plane becomes approximately the same plane until the hypothesis originates triangular facet and the termination triangular facet.
8. three-dimensional grid lines according to claim 7 stretch method, which is characterized in that
Triangular facet is originated in the target and target termination triangular facet determines step, if being judged as first intersection point in broken hole
On, then the second intersection point of the broken hole and the cut surface between first intersection point and terminal is calculated, described second is handed over
Point is updated to new starting point, and the triangular facet where second intersection point, which is set as new hypothesis, originates triangular facet, judges institute again
Hypothesis starting triangular facet and the termination triangular facet are stated whether in one plane until hypothesis starting triangular facet and described
Terminating triangular facet becomes approximately the same plane.
9. the three-dimensional grid lines according to any one of claim 6~8 stretch method, which is characterized in that
Triangular facet is originated in target and target termination triangular facet determines that step determines target starting triangular facet and target termination triangle
After face, further include：
New triangular facet step is built, using the cut point as new vertex, update is cut by what the cut surface was cut
All vertex index in face are constructed new triangular facet using each vertex in all vertex index, and are assigned to new triangular facet again
Give texture.
10. three-dimensional grid lines according to claim 9 stretch method, which is characterized in that
By all of its neighbor triangular facet of all new triangular facet and cut surface, both sides are divided to the left and right on the basis of the cut surface
After class, carry out respectively smooth.
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| CN201710818070.1A CN108734760A (en) | 2017-09-12 | 2017-09-12 | Three-dimensional grid lines stretch system and three-dimensional grid lines stretch method |
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| US20060132495A1 (en) * | 2004-12-21 | 2006-06-22 | Anderson Michael H | 2D/3D line rendering using 3D rasterization algorithms |
| CN101441780A (en) * | 2008-11-05 | 2009-05-27 | 武汉大学 | Method for slitting three-dimensional gridding model |
| CN101615299A (en) * | 2009-07-30 | 2009-12-30 | 上海交通大学 | Based on the stretching image processing method of the pipeline-shaped object of gravity field model |
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