CN102999515A - Method for obtaining embossment model modeling surface patch - Google Patents
Method for obtaining embossment model modeling surface patch Download PDFInfo
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- CN102999515A CN102999515A CN2011102727939A CN201110272793A CN102999515A CN 102999515 A CN102999515 A CN 102999515A CN 2011102727939 A CN2011102727939 A CN 2011102727939A CN 201110272793 A CN201110272793 A CN 201110272793A CN 102999515 A CN102999515 A CN 102999515A
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Abstract
The invention discloses a method for obtaining an embossment model modeling patch. The method comprises the following steps of: drawing or inputting a two-dimensional curve of an embossment pattern and performing discretizing treatment on the two-dimensional curve, so as to obtain straight segments which are corresponding to the two-dimensional curve and are connected end to end; gridding a plane in which the straight segments are positioned, so as to obtain a grid curved face and form multiple grid curve units; and performing polygonization treatment on the multiple grid curve units on the grid curved face, so as to obtain the embossment patch. According to the method, after the two-dimensional curve of the embossment model is discretized and gridded, that grid curved face is obtained for polygonization, so as to obtain the embossment patch for embossment model modeling, so that a clear boundary and straight side walls can be obtained during the embossment modeling process.
Description
Technical field
The present invention relates to make up in the field of computer aided design technology of dough sheet, particularly a kind of method for obtaining embossment model modeling dough sheet.
Background technology
Embossment is a kind of sculpture of the concavo-convex image that rises and falls of carve in the plane, is a kind of artistic expression between circular engravure and drawing.Computer carries out the embossment modeling, and traditional method is exactly on the rectangular node dot matrix of a sheet of planar, utilizes plane curve or bitmap to calculate the z value change amount of each net point, by changing the z value of each net point, constructs the shape of embossment.The method of this structure embossment, simple and flexible.The external software of supporting relief shape and processing all is to represent embossment by the z value of revising rectangular node such as the Artcam of Britain, the MasterCAM Art of the U.S. etc. at present.This modeling method, owing to only revise the z value of net point, at precipitous place or boundary, can produce sawtooth, cause obscure boundary clear, although reduce mesh spacing by integral body or part, can make boundary effect better, but increased data volume, and sawtooth exists all the time, do not satisfy the higher modeling of border and straight sidewall effect requirements and processing needs.
Summary of the invention
The object of the present invention is to provide a kind of method for obtaining embossment model modeling dough sheet, can not obtain the clearly problem on border and straight sidewall when being used for solving modeling.
According to an aspect of the present invention, provide a kind of method for obtaining embossment model modeling dough sheet, may further comprise the steps:
The two-dimensional curve of A, drafting or input relief pattern also carries out discrete processes to two-dimensional curve, obtains and the corresponding end to end straight-line segment of two-dimensional curve;
B, gridding is carried out on plane, straight-line segment place processed, obtain grid surface and form a plurality of grid curves unit;
C, on grid surface, a plurality of grid curves unit is carried out tiled and process, obtain the embossment dough sheet.
Preferably, steps A comprises:
Set the action error amount, dispersing according to the action error amount obtains many and the corresponding multi-section-line of two-dimensional curve, and every multi-section-line is made of many end to end straight-line segments;
The multi-section-line that intersects in many multi-section-lines is asked for intersection point, interrupt multi-section-line and form node at the intersection point place;
When there is intersection point in two-dimensional curve, when wherein a multi-section-line end points departs from other multi-section-line after discrete, the end points of a mobile multi-section-line is asked for intersection point so that the end points of this multi-section-line is crossing with nearest multi-section-line, interrupts nearest multi-section-line at the intersection point place and forms node;
Wherein, the point that joins of each straight-line segment is node.
Preferably, step B comprises:
Set step-length;
Create mesh lines according to step-length, obtain grid surface;
Wherein, mesh lines and straight-line segment consist of the grid curve unit.
Preferably, between step B and step C, also comprise:
Ask for intersection point for the straight-line segment that intersects with mesh lines, interrupt straight-line segment and form node at the intersection point place.
Preferably, step C comprises:
The grid curve unit that comprises straight-line segment is carried out tiled process, form tri patch;
The grid curve unit that does not comprise straight-line segment is carried out tiled process, form four limit dough sheets;
Wherein, the embossment dough sheet comprises tri patch and four limit dough sheets.
Preferably, the grid curve unit that comprises straight-line segment is carried out tiled processes, form tri patch, comprising:
If the mesh lines of grid curve unit and multi-section-line have two intersection points and inside, grid curve unit not to have node, then the straight-line segment between two intersection points is divided into two convex polygons to the grid curve unit, adopts De Laonei trigonometric ratio rule that two convex polygons are carried out tiled;
If grid curve has node in the unit, then all straight-line segments in the grid curve unit as binding side, adopt the De Laonei trigonometric ratio rule of two-dimentional belt restraining that this grid is carried out tiled according to binding side.
Compared with prior art, beneficial effect of the present invention is: the grid surface that the present invention obtains after processing by and gridding discrete to the two-dimensional curve of embossment model carries out tiled, be used for the embossment dough sheet of embossment model modeling with acquisition, thereby obtain clearly border and straight sidewall when being implemented in the embossment modeling.
Description of drawings
Fig. 1 is the method flow synoptic diagram for obtaining embossment model modeling dough sheet provided by the invention;
Fig. 2 is the synoptic diagram of explaining the lap of removing curve;
Fig. 3 explains the synoptic diagram that carries out discrete processes according to the action error amount;
Fig. 4 be explain discrete after to the synoptic diagram of the processing of the straight-line segment that intersects;
Fig. 5 explains the synoptic diagram of processing for disjoint straight-line segment behind the curve discretization that originally intersects;
Fig. 6 is the synoptic diagram of explaining according to create mesh lines to fixed step size;
Fig. 7 explains that mesh lines and straight-line segment ask for the synoptic diagram of intersection point;
Fig. 8 is the synoptic diagram of the mesh lines of explaining straight-line segment and grid curve unit tiled when only having two intersection points;
Fig. 9 is the synoptic diagram of explaining tiled when there is the multistage straight-line segment inside, a grid curve unit;
Figure 10 is the implementing procedure figure that the method for the acquisition embossment model modeling dough sheet that provides of the embodiment of the invention is used for the embossment model modelling approach of border subregion;
Figure 11 is the process flow diagram to the embossment dough sheet zoning of grid surface that the embodiment of the invention provides;
Figure 12 explains the synoptic diagram that generates with the embossment of straight sidewall effect;
Figure 13 is the synoptic diagram of explanation region segmentation.
Embodiment
To a preferred embodiment of the present invention will be described in detail, should be appreciated that following illustrated preferred embodiment only is used for description and interpretation the present invention, is not intended to limit the present invention below in conjunction with accompanying drawing.
Fig. 1 has shown the method flow signal for obtaining embossment model modeling dough sheet provided by the invention, as shown in Figure 1:
Step S101 draws or inputs the two-dimensional curve of relief pattern and two-dimensional curve is carried out discrete processes, obtains and the corresponding end to end straight-line segment of two-dimensional curve.
Set the action error amount, according to the action error amount discrete obtain many with the corresponding multi-section-line of two-dimensional curve, every multi-section-line is made of many end to end straight-line segments, wherein, fine degree to the two-dimensional curve discrete processes is controlled with the action error amount, and the action error is that point on the curve is to the ultimate range of straight-line segment.
The multi-section-line that intersects in many multi-section-lines is asked for intersection point, interrupt multi-section-line and form node at the intersection point place, when there is intersection point in two-dimensional curve, when wherein a multi-section-line end points departs from other multi-section-line after discrete, mobile this multi-section-line end points is asked for intersection point so that this multi-section-line end points is crossing with nearest multi-section-line, interrupts nearest multi-section-line at the intersection point place and forms node, wherein, the point that joins of each straight-line segment is node.
Before discrete processes, also should check drawing or inputting in the two-dimensional curve process whether heavy line is arranged, if there is heavy line then to delete the lap of curve.
Step S102 carries out gridding to plane, straight-line segment place and processes, and obtains grid surface and forms a plurality of grid curves unit.
Wherein, it is that plane, straight-line segment place is created mesh lines that gridding is processed, and obtains grid surface, and the mesh lines basis creates to fixed step size, and step-length is less, and the mesh lines that then creates is closeer, and when creating mesh lines, horizontal step-length and vertical step-length can be the same or different.Mesh lines and straight-line segment consist of the grid curve unit.
In addition, ask for intersection point for the straight-line segment that intersects with mesh lines, interrupt straight-line segment and form node at the intersection point place.
Step S103 carries out tiled to a plurality of grid curves unit and processes on grid surface, obtain the embossment dough sheet.
The grid curve unit that comprises straight-line segment is carried out tiled process, form tri patch.If the mesh lines of grid curve unit and multi-section-line have two intersection points and inside, grid curve unit not to have node, then the straight-line segment between two intersection points is divided into two convex polygons to the grid curve unit, adopt De Laonei trigonometric ratio rule that two convex polygons are carried out tiled, if grid curve has node in the unit, then all straight-line segments in the grid curve unit as binding side, adopt the De Laonei trigonometric ratio rule of two-dimentional belt restraining that this grid is carried out tiled according to binding side.
The grid curve unit that does not comprise straight-line segment is carried out tiled process, form four limit dough sheets.
Wherein, tri patch and four limit dough sheets are referred to as the embossment dough sheet.
Fig. 2 is the signal of explaining the lap of removing curve, as shown in Figure 2, given registration accuracy T, for the point of the P0 on the curve A, the closest approach P1 point that detection range P0 is ordered on curve B, if the distance that P0 point and P1 are ordered is less than given precision T, then P0 point and P1 point overlap, each point on the cyclic search curve A, curve B consists of lap with the point that curve A satisfies the condition of coincidence, the coincidence condition be exist on the curve B with curve A on the distance of point less than given precision T, deleting one by one with the overlapping point of curve B in the curve A, then deleted the lap of curve.
Fig. 3 explains the signal of carrying out discrete processes according to the action error amount, as shown in Figure 3, curve is approached this curve with a series of straight-line segment becomes multi-section-line, and discrete precision is controlled with the action error, the action error is called again the bow high level error, is that point on the curve is to the ultimate range of straight-line segment.Fig. 3 (a) has represented the action error of curve and straight-line segment, Fig. 3 (b) is primary curve, Fig. 3 (c) is that the action error is 0.025 millimeter end to end straight-line segment after discrete, and Fig. 3 (d) is that the action error is 0.04 millimeter end to end straight-line segment after discrete.
Fig. 4 be explain discrete after to the signal of the processing of the straight-line segment that intersects, as shown in Figure 4, the straight-line segment that intersects is asked for intersection point, interrupt straight-line segment and form node at the intersection point place, two crossing straight-line segments become four straight-line segments after interrupt and forms node at the intersection point place.Fig. 4 (a) is discrete rear two crossing straight-line segments, and Fig. 4 (b) asks for intersection point, four straight-line segments that form after interrupt and forms node at the intersection point place.
Fig. 5 explains the signal of processing for disjoint straight-line segment behind the curve discretization that originally intersects, as shown in Figure 5, Fig. 5 (a) is the closed figure that two curves form, Fig. 5 (b) is the partial enlarged drawing that this closed figure centre circle is lived part, intersect, Fig. 5 (c) is the enlarged drawing after this closed figure disperses, can find out that becoming of originally intersecting is non-intersect, at this moment, the end points of mobile straight-line segment makes it crossing with contiguous straight-line segment, shown in Fig. 5 (d), the end points of mobile straight-line segment, make it crossing with contiguous straight-line segment, then ask for intersection point, interrupt the straight-line segment of this vicinity and form node.
Fig. 6 is the signal of explaining according to create mesh lines to fixed step size, as shown in Figure 6, according to create horizontal gridlines and vertical mesh lines to fixed step size, the mesh lines point of crossing is for sharing point, Fig. 6 (a) is that step-length is the mesh lines of 0.5 millimeter establishment, and Fig. 6 (b) is that step-length is the mesh lines of 0.25 millimeter establishment.
Fig. 7 explains that mesh lines and straight-line segment ask for the signal of intersection point, as shown in Figure 7, when mesh lines and straight-line segment intersect, asks for intersection point, interrupts straight-line segment and forms node at the intersection point place.
Fig. 8 is the signal of the mesh lines of explaining straight-line segment and grid curve unit tiled when only having two intersection points, as shown in Figure 8, Fig. 8 (a) is two situations that intersection point is adjacent, straight-line segment between two intersection points has been divided into a triangle and a pentagon to a grid curve unit, adopts De Laonei trigonometric ratio rule tiled pentagon.Fig. 8 (b) is two situations that intersection point is relative, and the straight-line segment that two intersection points are linked to be has been divided into two quadrilaterals to grid, adopts two quadrilaterals of De Laonei trigonometric ratio rule tiled.
Fig. 9 is the signal of explaining tiled when there is the multistage straight-line segment inside, a grid curve unit, as shown in Figure 9, all straight-line segments in the grid curve unit as binding side, adopt the De Laonei trigonometric ratio rule of two-dimentional belt restraining to make up tri patch, Fig. 9 (a) expression be the situation that the mesh lines of straight-line segment and a grid curve unit has two intersection points, Fig. 9 (b) expression be the situation that the mesh lines of straight-line segment and a grid curve unit has three intersection points, Fig. 9 (c) represents is the situation that the mesh lines of straight-line segment and a grid curve unit has four intersection points.
Figure 10 has shown that the method for the acquisition embossment model modeling dough sheet that the embodiment of the invention provides is used for the implementing procedure of the embossment model modelling approach of border subregion, as shown in figure 10:
Step S1001, the two-dimensional curve of rendering model.
Step S1002 checks in the Drawing of Curve process whether heavy line is arranged, and removes the lap of curve.
Step S1003 carries out discrete processes to two-dimensional curve.According to the action error two-dimensional curve of drawing is carried out discrete processes and obtain end to end straight-line segment, for the straight-line segment that intersects after discrete, need these straight-line segments that intersects are asked for intersection point, interrupt straight-line segment and form node at the intersection point place, for the curve that originally intersects, discrete rear non-intersect, need the node of mobile straight-line segment, itself and contiguous straight-line segment are intersected, at the intersection point place straight-line segment interrupted and form node, thereby form new straight-line segment.
Step S1004 creates uniform rectangular node, forms grid surface, according to creating the vertical mesh lines of level to fixed step size, the mesh lines joining is for sharing point, and mesh lines and straight-line segment consist of the grid curve unit, and namely a grid forms a grid curve unit with the multi-section-line that passes through this grid.
Step S1005, mesh lines and the point of the Intersection of line segments after the discrete processes to rectangular node interrupt straight-line segment and form node at the intersection point place.
Step S1006 carries out tiled in each grid curve unit.
Inner in some grid curve unit, the mesh lines of straight-line segment and a grid curve unit only has two intersection points and grid inside not to have the straight-line segment node, the tiled method that adopts for such grid curve unit is: the straight-line segment between these two intersection points is divided into two convex polygons with grid, adopt De Laonei trigonometric ratio rule that two convex polygons are carried out tiled to these two convex polygons again, make up tri patch.
And there is the multistage straight-line segment some inside, grid curve unit, and the tiled method that adopts for such grid is: all straight-line segments in the grid are carried out tiled as the De Laonei trigonometric ratio rule of binding side, the two-dimentional belt restraining of employing, make up tri patch.
For the grid curve unit that does not have straight-line segment to pass through, consist of four limit dough sheets by the shared point of grid curve unit.
Step S1007, the straight-line segment after search is discrete also transfers the embossment border to.
Step S1008 is to the embossment dough sheet zoning of grid surface: the embossment dough sheet in the grid surface is divided in the different zones, makes dough sheet have area attribute.Wherein, be communicated with by adjacent this two the embossment dough sheets that then are called in common limit between two embossment dough sheets, then be called this two non-connections of embossment dough sheet by the embossment limit is adjacent between two embossment dough sheets.All embossment dough sheets of traversal grid surface, from wherein certain not the embossment dough sheet of setting area attribute, its area attribute is set, this embossment dough sheet as the 1st embossment dough sheet, find with the 2nd embossment dough sheet of its connection and to the 2nd embossment dough sheet and arrange and the 1st area attribute that the embossment dough sheet is identical, and then find the 3rd the embossment dough sheet that is communicated with the 2nd embossment dough sheet also to arrange and the 2nd area attribute that the embossment dough sheet is identical to the 3rd embossment dough sheet, until find K the embossment dough sheet that is communicated with K-1 embossment dough sheet, and the embossment dough sheet that is communicated with any one embossment dough sheet in K the embossment dough sheet is all till the setting regions attribute.So just marked off a zone; Similarly, by the next one embossment dough sheet of setting area attribute not, find to belong to the embossment dough sheet that is interconnected in the same subregion again, finish second subregion, until all embossment dough sheets have divided the zone.Thereby finish all the embossment dough sheet subregions grid surface.Wherein, K is natural number.
Behind the embossment dough sheet zoning of grid surface, give different area attributes for each zone, as giving color attribute, each color represents a zone.
Simultaneously, for making things convenient for each zone can generate embossment with the straight sidewall effect, to every embossment limit, structure degeneration dough sheet, and set up topological relation with original dough sheet: take the embossment limit of whole appearance profile as example, copy two points on it, four points then appear, overlapping point separately, construct four limit dough sheets, the straight sidewall effect occurs.
Step S1009, local high-quality details is constructed in local segmentation in the zone.
Certain zone is segmented: the limit that travels through all embossment dough sheets, to belonging to this regional embossment limit, add mid point, next again travel through the embossment dough sheet, again carry out tiled for the tri patch that has increased mid point, obtain new tri patch, carry out grid subdivision for the four limit dough sheets that increased mid point, obtain new four limit dough sheets, according to the new of adding local updating is carried out on the embossment border at last.
Step S1010 operates each zone of grid surface respectively, generates required embossment model; For ease of modeling and modification, the various operations that grid surface is carried out all are recorded on the historical tree of embossment.
The flow process to the embossment dough sheet zoning of grid surface that Figure 11 has shown that the embodiment of the invention provides, as shown in figure 11:
Step S1101, order travels through all embossment dough sheets of grid surface, judges that whether all embossment dough sheets have traveled through, and in this way, then stop algorithm; As no, execution in step S1102 then.
Step S1102 takes out i+1 embossment dough sheet, and wherein, i is natural number.
Step S1103 judges whether i dough sheet has divided the zone, in this way, then goes to step S1101; As no, execution in step S1104 then.
Step S1104 arranges the area attribute of dough sheet i, and is stacked to all common limits of dough sheet i.
Step S1105 judges that whether storehouse is empty, in this way, then goes to step S1101; As no, execution in step S1106 then.
Step S1106, the common limit e of ejection stack top.
Step S1107 judges whether the embossment dough sheet f that the common limit e of stack top connects has divided the zone, in this way, then goes to step S1105, as no, and execution in step S1108 then.
Step S1108 arranges the area attribute of embossment dough sheet f, and stacked to the common limit of embossment dough sheet f, then execution in step S1105.
Figure 12 explains the signal that generates with the embossment of straight sidewall effect, as shown in figure 12, to every embossment limit, construct the degeneration dough sheet, and set up topological relation with original dough sheet, take the embossment limit of whole appearance profile as example, suppose that two points on it are p1, p2 copies this two points, be designated as pCopy1, pCopy2; Utilize this four points, construct four limit dough sheets, deteriorate to straight line this moment, and when having the straight sidewall effect, overlapping point separately gets final product.
Figure 13 is the signal of explanation region segmentation, as shown in figure 13, certain zone is segmented: the limit that travels through all embossment dough sheets, to belonging to the limit in this zone, add mid point, next travel through the embossment dough sheet, the dough sheet that has added point is re-started tiled, according to the new of adding local updating is carried out on the embossment border at last.
In sum, the present invention has following technique effect: the present invention processes by the inner tiled of grid, make the embossment model of generation have clearly border and straight sidewall, solved in traditional modeling method at precipitous place or boundary produces the problem of sawtooth, improve the quality of lattice network model modeling and processing, also improved moulding and the border quality of embossment model simultaneously;
Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art can carry out various modifications according to principle of the present invention.Therefore, all modifications of doing according to the principle of the invention all should be understood to fall into protection scope of the present invention.
Claims (6)
1. a method that is used for obtaining embossment model modeling dough sheet is characterized in that, may further comprise the steps:
The two-dimensional curve of A, drafting or input relief pattern also carries out discrete processes to described two-dimensional curve, obtains and the corresponding end to end straight-line segment of described two-dimensional curve;
B, gridding is carried out on plane, described straight-line segment place processed, obtain grid surface and form a plurality of grid curves unit; And
C, on described grid surface, described a plurality of grid curves unit is carried out tiled and process, obtain the embossment dough sheet.
2. method according to claim 1 is characterized in that, described steps A comprises:
Set the action error amount, dispersing according to described action error amount obtains many and the corresponding multi-section-line of described two-dimensional curve, and every multi-section-line is made of many end to end straight-line segments;
The multi-section-line that intersects in described many multi-section-lines is asked for intersection point, interrupt multi-section-line and form node at the intersection point place; And
When there is intersection point in described two-dimensional curve, when wherein a multi-section-line end points departs from other multi-section-line after discrete, the end points of a mobile described multi-section-line is so that the end points of this multi-section-line is crossing with nearest multi-section-line, ask for intersection point, interrupt described nearest multi-section-line at the intersection point place and form node;
Wherein, the point that joins of each straight-line segment is node.
3. method according to claim 1 is characterized in that, described step B comprises:
Set step-length; And
Create mesh lines according to described step-length, obtain grid surface;
Wherein, described mesh lines and described straight-line segment consist of the grid curve unit.
4. method according to claim 3 is characterized in that, between described step B and step C, also comprises:
Ask for intersection point for the straight-line segment that intersects with mesh lines, interrupt straight-line segment and form node at the intersection point place.
5. method according to claim 4 is characterized in that, described step C comprises:
The grid curve unit that comprises described straight-line segment is carried out tiled process, form tri patch; And
The grid curve unit that does not comprise described straight-line segment is carried out tiled process, form four limit dough sheets;
Wherein, described embossment dough sheet comprises described tri patch and described four limit dough sheets.
6. method according to claim 5 is characterized in that, describedly the grid curve unit that comprises straight-line segment is carried out tiled processes, and forms tri patch, comprising:
If the mesh lines of grid curve unit and multi-section-line have two intersection points and inside, grid curve unit not to have node, then the straight-line segment between described two intersection points is divided into two convex polygons to the grid curve unit, adopts De Laonei trigonometric ratio rule that described two convex polygons are carried out tiled; And
If grid curve has node in the unit, then all straight-line segments in the grid curve unit as binding side, adopt the De Laonei trigonometric ratio rule of two-dimentional belt restraining that this grid is carried out tiled according to binding side.
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| CN105303616A (en) * | 2015-11-26 | 2016-02-03 | 青岛尤尼科技有限公司 | Embossment modeling method based on single photograph |
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| CN105303616A (en) * | 2015-11-26 | 2016-02-03 | 青岛尤尼科技有限公司 | Embossment modeling method based on single photograph |
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