CN102999945A - Mesh surface area division method for modeling of embossment model - Google Patents
Mesh surface area division method for modeling of embossment model Download PDFInfo
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- CN102999945A CN102999945A CN201110272992XA CN201110272992A CN102999945A CN 102999945 A CN102999945 A CN 102999945A CN 201110272992X A CN201110272992X A CN 201110272992XA CN 201110272992 A CN201110272992 A CN 201110272992A CN 102999945 A CN102999945 A CN 102999945A
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Abstract
The invention discloses a mesh surface area division method for modeling of an embossment model. The mesh surface area division method for modeling of the embossment model includes: traversing embossment surface patches for modeling of the embossment model; giving different attributes to the embossment surface patches positioned on different sides of an embossment boundary, and giving the same attributes to the embossment surface patches positioned on the same sides of the embossment boundary; and combining the embossment surface patches with the same attributes into an embossment area. Area division of mesh surfaces is achieved by setting corresponding area attributes for the embossment surface patches positioned on two sides of the embossment boundary, so that each area can be operated independently; and modeling operations of the embossment model are recorded to improve embossment modeling and editing efficiency.
Description
Technical field
The present invention relates to the regional partitioning technology of the grid surface of field of computer aided design, particularly a kind of grid surface region partitioning method for the embossment model modeling.
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 revising 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.Simultaneously traditional embossment modeling method does not record the parameter of each moulding mostly, is difficult to after the modeling revise any single job before, affects moulding and editor's efficient.
Summary of the invention
The object of the present invention is to provide a kind of grid surface region partitioning method for the embossment model modeling, be used for solving the regional problem of dividing of grid surface of embossment model modeling process.
According to an aspect of the present invention, provide a kind of grid surface region partitioning method for the embossment model modeling, may further comprise the steps:
A, traversal are used for the embossment dough sheet of embossment model modeling;
B, be positioned at the embossment border not the embossment dough sheet of homonymy give different attribute, give same alike result the embossment dough sheet that is positioned at embossment border homonymy;
C, the embossment dough sheet with same alike result is merged into embossment region.
Preferably, step B comprises:
B1, search the embossment dough sheet that is positioned at embossment border one side and be positioned at the embossment dough sheet of embossment border opposite side;
B2, the embossment dough sheet that is positioned at embossment border one side that finds is set identical first area attribute;
B3, the embossment dough sheet that is positioned at embossment border opposite side that finds is set identical second area attribute.
Preferably, step B2 and step B3 are specially:
When traversing i embossment dough sheet, judge whether to i embossment dough sheet setting regions attribute;
If to i embossment dough sheet setting regions attribute, then i+1 embossment dough sheet judged;
If not to i embossment dough sheet setting regions attribute, then give described i embossment dough sheet setting regions attribute, and traversal is by common limit and i the embossment dough sheet that the embossment dough sheet is adjacent;
Give by the embossment dough sheet setting regions attribute of setting regions attribute not in the embossment dough sheet adjacent with i embossment dough sheet of common limit;
Wherein, i is natural number, and for the limit of all embossment dough sheets of grid surface, the limit that belongs to the embossment border is the embossment limit, and the limit that does not belong to the embossment border is common limit.
Preferably, before steps A, also comprise:
To drawing or the two-dimensional curve of the relief pattern of input carries out discrete processes, obtain and the corresponding end to end straight-line segment of two-dimensional curve;
Gridding is carried out on plane, straight-line segment place processed, obtain grid surface and form a plurality of grid curves unit;
On grid surface, a plurality of grid curves unit is carried out tiled and process, obtain the embossment dough sheet;
Obtain the embossment border at grid surface search straight-line segment.
Preferably, after step C, also comprise:
Respectively the embossment region with different attribute on the grid surface is carried out corresponding operating and generate the embossment model.
Preferably, after step C, also comprise:
Each step operation note to grid surface is set in embossment history.
Compared with prior art, beneficial effect of the present invention is: the present invention is by setting corresponding area attribute to the embossment dough sheet that is positioned at the embossment boundaries on either side, realized the zone division of grid surface, so that each zone can independently operate, record simultaneously the modelling operability of embossment model, improved embossment modeling and editor's efficient.
Description of drawings
Fig. 1 is the schematic flow sheet of the grid surface region partitioning method for the embossment model modeling provided by the invention;
Fig. 2 is the process flow diagram to the embossment dough sheet zoning of grid surface that the embodiment of the invention provides;
Fig. 3 explains the schematic diagram that generates with the embossment of straight sidewall effect;
Fig. 4 is the schematic diagram of explanation region segmentation;
Fig. 5 is the implementing procedure figure that the grid surface region partitioning method that provides of the embodiment of the invention is used for the embossment model modelling approach of border subregion;
Fig. 6 is the schematic diagram of explaining the lap of removing curve;
Fig. 7 explains the schematic diagram that carries out discrete processes according to the action error amount;
Fig. 8 be explain curve discrete after to the schematic diagram of the processing of the straight-line segment that intersects;
Fig. 9 explains the schematic diagram of processing for the discrete rear disjoint straight-line segment of the curve that originally intersects;
Figure 10 is the schematic diagram of explaining according to create mesh lines to fixed step size;
Figure 11 explains that mesh lines and straight-line segment ask for the schematic diagram of intersection point;
Figure 12 is the schematic diagram of the mesh lines of explaining straight-line segment and grid curve unit tiled when only having two intersection points;
Figure 13 is the schematic diagram of explaining tiled when there is the multistage straight-line segment inside, a grid curve unit.
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 flow process signal of the grid surface region partitioning method for the embossment model modeling provided by the invention, as shown in Figure 1:
Step S101, traversal is used for the embossment dough sheet of embossment model modeling.
The process that obtains the embossment dough sheet is: to drawing or the two-dimensional curve of the relief pattern of input carries out discrete processes, obtain and the corresponding end to end straight-line segment of two-dimensional curve, gridding is carried out on plane, straight-line segment place to be processed, obtain grid surface and form a plurality of grid curves unit, on grid surface, a plurality of grid curves unit is carried out tiled and process, obtain the embossment dough sheet.
Wherein, obtain embossment border for the embossment model modeling at grid surface search straight-line segment.
Step S102, be positioned at the embossment border not the embossment dough sheet of homonymy give different attribute, give same alike result the embossment dough sheet that is positioned at embossment border homonymy.
Search the embossment dough sheet that is positioned at embossment border one side and the embossment dough sheet that is positioned at embossment border opposite side, the embossment dough sheet that is positioned at embossment border one side that finds is set identical first area attribute, the embossment dough sheet that is positioned at embossment border opposite side that finds is set identical second area attribute.
Give the method for embossment dough sheet setting regions attribute as follows: when traversing i embossment dough sheet, to judge whether to i embossment dough sheet setting regions attribute; If to i embossment dough sheet setting regions attribute, then i+1 embossment dough sheet judged; If not to i embossment dough sheet setting regions attribute, then give i embossment dough sheet setting regions attribute, and traversal is by common limit and i the embossment dough sheet that the embossment dough sheet is adjacent; Give by the embossment dough sheet setting regions attribute of setting regions attribute not in the embossment dough sheet adjacent with i embossment dough sheet of common limit; Wherein, i is natural number, and for the limit of all embossment dough sheets of grid surface, the limit that belongs to the embossment border is the embossment limit, and the limit that does not belong to the embossment border is common limit.
Step S103 is merged into embossment region to the embossment dough sheet with same alike result, and respectively the embossment region with different attribute on the grid surface is carried out corresponding operating generation embossment model.
After the embossment dough sheet being carried out the zone division, region segmentation can be independently carried out in each zone, to obtain local high-quality details.
Simultaneously, each the step operation note to grid surface is set in embossment history.
The flow process to the embossment dough sheet zoning of grid surface that Fig. 2 has shown that the embodiment of the invention provides, as shown in Figure 2:
Step S201, 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 S202 then.
Step S202 takes out i+1 embossment dough sheet, and wherein, i is natural number.
Step S203 judges whether i dough sheet has divided the zone, in this way, then goes to step S201; As no, execution in step S204 then.
Step S204 arranges the area attribute of dough sheet i, and is stacked to all common limits of dough sheet i.
Step S205 judges that whether storehouse is empty, in this way, then goes to step S201; As no, execution in step S206 then.
Step S206, the common limit e of ejection stack top.
Step S207 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 S205, as no, and execution in step S208 then.
Step S208 arranges the area attribute of embossment dough sheet f, and stacked to the common limit of embossment dough sheet f, then execution in step S205.
Fig. 3 explains the signal that generates with the embossment of straight sidewall effect, as shown in Figure 3, 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.
Fig. 4 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.
Fig. 5 has shown that grid surface region partitioning method 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 5:
Step S501, the two-dimensional curve of rendering model.
Step S502 checks in the Drawing of Curve process whether heavy line is arranged, and removes the lap of curve.
Step S503 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 S504 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 S505, 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 S506 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 line segment that is linked to be with 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 S507, the straight-line segment after search is discrete also transfers the embossment border to.
Step S508 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 S509, 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 S510 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.
Fig. 6 is the signal of explaining the lap of removing curve, as shown in Figure 6, 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. 7 explains the signal of carrying out discrete processes according to the action error amount, as shown in Figure 7, 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. 7 (a) has represented the action error of curve and straight-line segment, Fig. 7 (b) is primary curve, Fig. 7 (c) is that the action error is 0.025 millimeter end to end straight-line segment after discrete, and Fig. 7 (d) is that the action error is 0.04 millimeter end to end straight-line segment after discrete.
Fig. 8 be explain discrete after to the signal of the processing of the straight-line segment that intersects, as shown in Figure 8, 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. 8 (a) is discrete rear two crossing straight-line segments, and Fig. 8 (b) asks for intersection point, four straight-line segments that form after interrupt and forms node at the intersection point place.
Fig. 9 explains the signal of processing for disjoint straight-line segment behind the curve discretization that originally intersects, as shown in Figure 9, Fig. 9 (a) is the closed figure that two curves form, Fig. 9 (b) is the partial enlarged drawing that this closed figure centre circle is lived part, intersect, Fig. 9 (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. 9 (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.
Figure 10 is the signal of explaining according to create mesh lines to fixed step size, as shown in figure 10, according to create horizontal gridlines and vertical mesh lines to fixed step size, the mesh lines point of crossing is for sharing point, Figure 10 (a) is that step-length is the mesh lines of 0.5 millimeter establishment, and Figure 10 (b) is that step-length is the mesh lines of 0.25 millimeter establishment.
Figure 11 explains that mesh lines and straight-line segment ask for the signal of intersection point, as shown in figure 11, when mesh lines and straight-line segment intersect, asks for intersection point, interrupts straight-line segment and forms node at the intersection point place.
Figure 12 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 12, Figure 12 (a) is two situations that intersection point is adjacent, the straight-line segment that two intersection points are linked to be has been divided into a triangle and a pentagon to a grid curve unit, adopts De Laonei trigonometric ratio rule tiled pentagon.Figure 12 (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.
Figure 13 is the signal of explaining tiled when there is the multistage straight-line segment inside, a grid curve unit, as shown in figure 13, 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, Figure 13 (a) expression be the situation that the mesh lines of straight-line segment and a grid curve unit has two intersection points, Figure 13 (b) expression be the situation that the mesh lines of straight-line segment and a grid curve unit has three intersection points, Figure 13 (c) represents is the situation that the mesh lines of straight-line segment and a grid curve unit has four intersection points.
In sum, the present invention has following technique effect: the present invention is by setting corresponding area attribute to the embossment dough sheet that is positioned at the embossment boundaries on either side, realized the zone division of grid surface, behind the grid surface subregion, the independently local segmentation of each zone, namely each zone can independently operate, and records simultaneously the modelling operability of embossment model, be convenient to modeling and modification, improved embossment modeling and editor's efficient.
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 grid surface region partitioning method that is used for the embossment model modeling is characterized in that, may further comprise the steps:
A, traversal are used for the embossment dough sheet of embossment model modeling;
B, be positioned at the embossment border not the embossment dough sheet of homonymy give different attribute, give same alike result the embossment dough sheet that is positioned at embossment border homonymy; And
C, the embossment dough sheet with same alike result is merged into embossment region.
2. method according to claim 1 is characterized in that, described step B comprises:
B1, search the embossment dough sheet that is positioned at embossment border one side and be positioned at the embossment dough sheet of embossment border opposite side;
B2, the embossment dough sheet that is positioned at embossment border one side that finds is set identical first area attribute; And
B3, the embossment dough sheet that is positioned at embossment border opposite side that finds is set identical second area attribute.
3. method according to claim 2 is characterized in that, described step B2 and step B3 are specially:
When traversing i embossment dough sheet, judge whether to described i embossment dough sheet setting regions attribute;
If to described i embossment dough sheet setting regions attribute, then i+1 embossment dough sheet judged;
If not to described i embossment dough sheet setting regions attribute, then give described i embossment dough sheet setting regions attribute, and traversal is by the common limit embossment dough sheet adjacent with described i embossment dough sheet; And
Give described by the embossment dough sheet setting regions attribute of setting regions attribute not in the embossment dough sheet adjacent with described i embossment dough sheet of common limit;
Wherein, i is natural number, and for the limit of all embossment dough sheets of grid surface, the limit that belongs to the embossment border is the embossment limit, and the limit that does not belong to the embossment border is common limit.
4. method according to claim 1 is characterized in that, before described steps A, also comprises:
To drawing or the two-dimensional curve of the relief pattern of input carries out discrete processes, obtain and the corresponding end to end straight-line segment of described two-dimensional curve;
Gridding is carried out on plane, described straight-line segment place processed, obtain grid surface and form a plurality of grid curves unit;
On described grid surface, described a plurality of grid curves unit is carried out tiled and process, obtain the embossment dough sheet; And
Obtain the embossment border at described grid surface search straight-line segment.
5. method according to claim 1 is characterized in that, after described step C, also comprises:
Respectively the embossment region with different attribute on the grid surface is carried out corresponding operating and generate the embossment model.
6. according to the described method of above any one claim, it is characterized in that, after described step C, also comprise:
Each step operation note to grid surface is set in embossment history.
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