CN107767439B - Method for generating three-dimensional metal advertisement word model - Google Patents
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Abstract
A method for generating a three-dimensional metal advertising word model comprises identifying a connected region and a closed contour from a two-dimensional graph of an advertising word; obtaining an entity area corresponding to each communication area; establishing a coordinate system of the advertisement words; enabling the y axis of the coordinate system of the advertisement words to be parallel to or coincident with the y axis of the world coordinate system, and obtaining the height of the two-dimensional graph on the y axis; inputting the inclination angle, the front end height and the initial rear end height of the top surface of the advertisement character; rotating the two-dimensional graph to a first reference plane by taking an x axis of a coordinate system of the advertisement words as a rotating axis; translating the two-dimensional graph upwards along the normal direction of the first reference surface to obtain S1 and a second reference surface; translating S1 to obtain a second contour group; projecting S1 to obtain S3; the first contour group is the top shape of the character, and the bottom shape and the side shape of the character are obtained by S2 and S3. The invention has the advantages of automatically identifying the two-dimensional graph of the advertisement character, generating the top surface, the bottom surface and the side surface of the three-dimensional advertisement character and having high production efficiency.
Description
Technical Field
The invention relates to the field of advertisement words, in particular to a three-dimensional metal advertisement word and a generation method of a model thereof.
Background
The advertising characters are very wide in variety, can be divided into resin characters, metal characters, luminous characters and the like according to different manufactured materials, are very wide in application range, are used for building doorways and large three-dimensional landscape characters besides the advertising character signboards hung on markets and buildings in common use, can improve the striking degree of the advertising characters and the aesthetic feeling by inclining the top surfaces of the three-dimensional characters at an angle, are generally manufactured by metal and other durable materials, and are the development trend of the advertising characters of the large signboard at present.
Chinese patent 201010623786.4 discloses a method for making three-dimensional metal characters, comprising the following steps: s1: manufacturing a font three-dimensional wooden or PVC board mold meeting the size proportion requirement according to the font pattern; s2: dividing the three-dimensional die into 1 or more regional components, and marking the regional components; s3: covering rubbing materials on each plane of the area component to obtain a plane unfolding unit corresponding to the area component, and numbering the plane unfolding unit with the same number as the identification of the corresponding area component; s4: expanding the planar expansion unit according to the size ratio in S1; s5: cutting the expanded plane unfolding unit by adopting a metal plate; s6: and welding and molding the planar unfolding unit at the same position as the area component according to the number of the font pattern and the area component identifier.
The method for manufacturing the three-dimensional metal characters has the following disadvantages: 1. a solid mold of wood or french board needs to be made and the corresponding planar expansion unit is obtained by covering the area members with a rubbing material, which is time consuming and inconvenient to modify. 2. The components of the identification area are manually divided, so that automatic operation cannot be performed, the production efficiency is low, and automatic production of the advertisement words cannot be realized.
Disclosure of Invention
The invention aims to provide a three-dimensional metal advertisement word and a generation method of a model thereof, wherein the three-dimensional metal advertisement word can be quickly formed, and simultaneously, the geometric shapes of the bottom surface and the side surface of the advertisement word model can be accurately output so as to be used for cutting a metal plate of the subsequent advertisement word.
The three-dimensional metal advertisement word to be formed by the invention has the following shape structure: a three-dimensional metal advertisement character is characterized in that the top of the character displayed on a paper surface is the rear side of the advertisement character, the bottom of the character displayed on the paper surface is the front side, the top surface of the advertisement character is inclined, the front side of the advertisement character is lower than the rear side, and the bottom surface consists of a plane part in contact with a horizontal plane and an inclined plane part parallel to the top surface. The front side height, the rear side height and the top surface inclined angle of the advertisement words are customized by users.
A method for generating a three-dimensional metal advertisement word model specifically comprises the following steps:
step 1: reading in two-dimensional graphic file of advertisement words, and identifying all closed outlines in two-dimensional graphic
N is the total number of closed contours; classifying the closed contours according to the connected regions; for example, the Chinese character and the three-point ink are three closed
The outer contour and the inner contour of the 'again' are respectively
And the Chinese character 'Han' has four communicating areas,
；
step 2: sequentially obtaining entity areas of the advertisement words corresponding to the closed outlines in each communication area;
and step 3: establishing a coordinate system of the advertisement words for the two-dimensional graph of the advertisement words, wherein the coordinate system of the advertisement words takes the central line of the words from top to bottom as the y axis, and the bottom edge of the words or the vector passing through the bottoms of the words as the x axis; judging whether the y-axis direction of the coordinate system of the advertisement words is parallel to or coincident with the y-axis direction of the world coordinate system of the graphic software, if so, acquiring the height of the two-dimensional graphic in the y-axis direction; if not, enabling the y axis of the coordinate system of the advertisement character to be parallel to or coincident with the y axis of the world coordinate system, and calculating the height of the rotated two-dimensional graph on the y axis;
and 4, step 4: inputting the inclined angle of the top surface of the advertisement wordθFront end heightH1And initial back end heightH2 0 According to heighth、Inclination angleθFront end heightH1Checking the height of the rear endH2(ii) a Maximum rear heightH2 max = H1+h*tanθ，If it isH2 0 <H2 max , Then H2= H2 0 (ii) a If it isH2 0 >H2 max ,Require re-entryH2 0 ；
And 5: the x axis of the coordinate system of the advertisement words is taken as a rotating axis to rotate the two-dimensional graph by an inclination angleθAfter rotatingThe plane where the two-dimensional outline is located is a first reference plane;
step 6: the two-dimensional graph is translated upwards along the normal direction of the first reference surface by the translation distanceH1Obtaining a first contour group S1, and taking the plane where the first contour group S1 is located as a second reference plane;
and 7: translating the first set of profiles S1 downward along the normal to the second reference plane by an offset distanceH2Obtaining a second contour group S2;
and 8: projecting the first contour set S1 along an XOY plane normal to the first reference plane to obtain a third contour set S3;
and step 9: the first contour group S1 is the shape of the top surface of the letter, and the shape of the bottom surface and the shape of the side surface of the letter are obtained by S2 and S3.
In the step 1, the two-dimensional graphic file of the advertisement word is a dxf file or a plt file; the dxf file or plt file is a drawing exchange file exported by two-dimensional drawing design software (e.g., AutoCAD, CorelDraw, etc.).
Further, the step 2 of obtaining the entity area of the advertisement word comprises the following steps:
step 2-1: judging the number of connected areas in the two-dimensional graphic file, and if only one connected area exists, taking the connected area as the current connected area; if two or more communicated areas exist, one communicated area is selected as the current communicated area;
2-2: judging whether the number of closed polygons in the current communication area is greater than 1, if so, entering the step 2-3; if not, entering the step 2-4;
step 2-3: grouping closed polygons in the current communication area according to the inclusion and contained relations, and determining an entity area of the advertisement words;
step 2-4: taking the area surrounded by the unique closed polygons as an entity area of the advertisement words;
step 2-5: judging whether the current connected region is the last connected region, if so, outputting all the entity regions, and entering the step 3; if not, taking the next connected region as the current connected region, and repeating the steps 2-2 to 2-4.
Further, the specific method for grouping closed polygons in step 2-3 includes the following steps:
step 2-3-1: the closed polygons in the current communication area are numbered 1,2, …,i…, N, N is the total number of closed polygons; first, theiA closed polygon is included ini-1 closed polygon; closed polygons which are contained in the same closed polygon but do not contain and are contained in relation to each other are numbered in the same way, for example, B, the outer contour is coded as 1, and the two inner contours are respectively coded as 2;
step 2-3-2: first, thejIs first and secondj-1 closed polygons are grouped into a group,jis an even number and is provided with a plurality of groups,jstarting from 2; orjIs an odd number of the components,jstarting from 1;
step 2-3-3: the area enclosed by the closed polygons of each group is the solid area of the advertisement word.
In step 9, the specific method for calculating the bottom surface of the advertisement word is as follows:
step 9-1-A: obtaining an intersection line L of the second contour group S2 and the third contour group S3;
step 9-1-B: the second contour group S2 and the third contour group S3 are segmented with the intersecting line L: for S2, delete the area below the intersection L, resulting in S2'; for S3, delete the area above the intersection L, resulting in S3';
step 9-1-C: the bottom surface of the advertisement word is formed by S2 'and S3'.
In step 9, the specific method for calculating the side of the advertisement word is as follows:
step 9-2-1: reading all closed contours in a first contour group S1, wherein each closed contour corresponds to a side figure, and taking any closed contour as a current closed contour;
step 9-2-2: obtaining the perimeter of the current closed contour, dispersing the current closed contour with the same sampling precision, numbering sampling points on the current closed contour in sequence, projecting discrete points on the current closed contour to the bottom surface, and obtaining the distance value between the discrete points on the current closed contour and the projected points; storing the serial numbers and the distance values of the sampling points;
step 9-2-3: numbering sampling points on a horizontal line according to the sequence of the sampling points of the current closed contour, wherein the sampling points of the horizontal line correspond to the sampling points of the current closed contour one by one; acquiring a corresponding point with a distance value perpendicular to the sampling point for each sampling point on a horizontal line, wherein all the corresponding points are positioned above the horizontal line or below the horizontal line simultaneously, all the corresponding points are connected in sequence to form a line, the first sampling point and the corresponding point are connected, the last sampling point and the corresponding point are connected, and a graph formed by connecting the horizontal line, the first sampling point and the corresponding point, the last sampling point and the corresponding point and the connecting line of all the corresponding points is a plane expansion graph of the side surface of the current closed contour;
step 9-2-4: judging whether the current closed contour is the last closed contour of the first contour group S1, if so, outputting the obtained plane expanded graph of the side face; if not, taking the next closed contour as the current closed contour, and repeating the steps 9-2-2 to 9-2-4.
After the top surface graph, the bottom surface graph and the side surface graph of the three-dimensional metal advertisement word model are obtained by using the method, the top surface graph, the bottom surface graph and the side surface graph are output and manufactured into the solid top surface, the solid bottom surface and the solid side surface. The side surface is folded and welded with the top surface and the bottom surface to form the three-dimensional metal advertisement character.
The invention has the advantages that:
1. the model of the three-dimensional metal advertisement word can be quickly generated according to the two-dimensional model of the read-in advertisement word outline and relevant parameters (including the top surface inclination angle, the front end height and the rear end height), and the method has the characteristics of simplicity and convenience; meanwhile, the geometrical shapes of the bottom surface and the side surface of the advertisement character model can be accurately input for subsequent cutting of the metal plate.
2. The two-dimensional graphs of the advertisement words are automatically identified in software, and the plane graphs of the top surfaces, the bottom surfaces and the side surfaces of the three-dimensional advertisement words are generated from the two-dimensional graphs, so that the reproducibility is high, and the production efficiency is high.
Drawings
FIG. 1 is a flow chart of a method for generating a three-dimensional metal advertisement word model according to the present invention.
FIG. 2 is a diagram of a dxf file that reads in an outline of an advertisement word.
Fig. 3 is a schematic diagram illustrating the identification of the outline number as the solid area.
Fig. 4 is a highly schematic view in the y-direction after the profile has been rotated.
Fig. 5 is a schematic view of the profile rotated by the tilt angle.
Fig. 6 is a schematic diagram of obtaining the first contour group S1.
Fig. 7 is a schematic diagram of obtaining a second contour set S2.
Fig. 8 is a schematic diagram of a third contour set S3.
FIG. 9 is a schematic diagram of the bottom of the advertisement word obtained according to S2 and S3.
Fig. 10 is a schematic diagram of the obtained three-dimensional advertisement word model.
Fig. 11 is a schematic top, bottom and side views of a three-dimensional advertisement word.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the present invention.
FIG. 1 is a flow chart of a method for generating a three-dimensional metal advertisement word model according to the present invention. The method of model generation is illustrated by the two-dimensional outline of the letter a in fig. 2.
Step 1: reading in and analyzing a dxf file of a letter A as shown in FIG. 2, wherein the letter A only has one connected region, and 2 closed polygons are arranged in the connected region;
step 2: analyzing the mutual inclusion relation among the closed polygons, grouping the outlines and determining the entity area of the advertisement words;
step 2-1: numbering all contours hierarchically according to the mutual inclusion relationship among the closed polygons, wherein the outer contour is 0 and the inner contour is 1, as shown in fig. 2;
step 2-2: the profiles are grouped according to the hierarchy number, specifically, the profile with the number of 0 and the profile with the number of 1 contained by the profile with the number of 2 are a group, and the profile with the number of 1 contained by the profile with the number of 2 contained by the profile with the number of 1 contained by the profile with the number of 0The profiles of 3 are grouped, and so on, if a certain profile does not contain other profiles, the profile itself is grouped, and in the case, the closed profiles 0 and 1 are grouped; in this embodiment, starting from 0, j is an odd number and starts from 1. If the closed contour is numbered from 1, thenjShould be even and start with 2.
Step 2-3: the area enclosed by the outlines 0 and 1 is the solid area of the advertisement word, and the shaded area shown in fig. 3 is the solid area of the advertisement word.
And step 3: included angle between y-axis of advertising word coordinate system of two-dimensional graph formed by closed outlines 0 and 1 and y-axis of world coordinate system of graph softwareα=-45 oThen all contours are rotated by an angle 45 oI.e. rotate 45 counterclockwise oAs shown in fig. 4, the y-axis of the advertisement word coordinate system of the rotated two-dimensional graph is parallel to the y-axis of the world coordinate system of the recognition software, and a is vertical; calculate the height of all polygon outlines in the y-direction after rotationhHeight of two-dimensional pattern of A in the present embodimenthIs 90 cm.
And 4, step 4: inputting the inclined angle of the advertisement wordθ=30oFront end heightH1=10mm and initial rear end heightH2 0 =45mm, according to heighth、Inclination angleθFront end heightH1Checking the height of the rear endH2The maximum rear end height is
Because of the initial back-end height of the inputH2 0 Less than H2Maximum valueNo adjustment is required.
And 5: rotating the closed outline 0 and the closed outline 1 by using the X axis of the coordinate system of the advertisement word as a rotating axis, wherein the rotating angle is 30 degreesoAfter rotation, the closed contour 0 and the closed contour 1 are located at the first reference plane, and the result is shown in fig. 5.
Step 6: the closed contour 0 and the closed contour 1 are translated upwards along the normal direction of the first reference plane by an offset distance ofH1=10mm, a first contour set S1 is obtained,the plane in which the first contour group is located is a second reference plane, as shown in fig. 6;
and 7: translating the first set of profiles S1 downward along the normal to the second reference plane by an offset distanceH2=45mm, resulting in a second profile set S2, as shown in fig. 7;
and 8: projecting the first contour set S1 to the XOY plane to obtain a third contour set S3, as shown in FIG. 8;
and step 9: the first contour group S1 is used as the top surface of the advertising word, and the top surface consists of two areas, namely a1 and a 2; the geometrical shapes of the bottom and side surfaces of the advertisement character are obtained in S2 and S3:
step 9-1: the specific method for calculating the bottom surface of the advertisement word comprises the following steps:
step 9-1-A: obtaining an intersection line L of the second contour group S2 and the third contour group S3;
step 9-1-B: the second contour group S2 and the third contour group S3 are segmented with the intersecting line L: for S2, delete the area below the intersection L, resulting in S2'; for S3, delete the area above the intersection L, resulting in S3';
step 9-1-C: the bottom surface of the advertising character is formed by S2 'and S3', and consists of four areas, namely c1, c2, c3 and c 4;
step 9-2: the specific method for calculating the side of the advertisement word comprises the following steps:
step 9-2-1: reading all closed contours in the first contour group S1, wherein each closed contour corresponds to a side figure, and taking the closed contour as a current closed contour 0;
step 9-2-2: obtaining the perimeter of the current closed contour, dispersing the current closed contour with the same sampling precision, numbering sampling points on the current closed contour in sequence, projecting discrete points on the current closed contour to the bottom surface, and obtaining the distance value between the discrete points on the current closed contour and the projected points; storing the serial numbers and the distance values of the sampling points;
step 9-2-3: numbering sampling points on a horizontal line according to the sequence of the sampling points of the current closed contour, wherein the sampling points of the horizontal line correspond to the sampling points of the current closed contour one by one; acquiring a corresponding point with a distance value perpendicular to the sampling point for each sampling point on a horizontal line, wherein all the corresponding points are positioned above the horizontal line or below the horizontal line simultaneously, all the corresponding points are connected in sequence to form a line, the first sampling point and the corresponding point are connected, the last sampling point and the corresponding point are connected, and a graph formed by connecting the horizontal line, the first sampling point and the corresponding point, the line of the last sampling point and the corresponding point and the line of all the corresponding points is a plane expansion graph b1 surrounding the side face of the current closed contour;
step 9-2-4: if the current closed contour 0 is not the last closed contour of the first contour group S1, the closed contour 1 is the current closed contour, and the steps 9-2-2 to 9-2-4 are repeated; obtaining a side b2 enclosed by the closed contour 1; closed contour 1 is already the last closed contour of the first contour group S1, output flanks b1 and b 2.
After the top surface graph, the bottom surface graph and the side surface graph of the three-dimensional metal advertisement word model are obtained by using the method, the top surface graph, the bottom surface graph and the side surface graph are output and manufactured into the solid top surface, the solid bottom surface and the solid side surface. The side surface is folded and welded with the top surface and the bottom surface to form the three-dimensional metal advertisement character.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made without departing from the principle of the present invention shall be included in the protection scope of the present invention.
Claims (3)
1. A method for generating a three-dimensional metal advertisement word model specifically comprises the following steps:
step 1: reading in two-dimensional graphic file of advertisement words, and identifying all closed outlines in two-dimensional graphic
N is the total number of closed contours; classifying the closed contours according to the connected regions;
step 2: sequentially obtaining entity areas of the advertisement words corresponding to the closed outlines in each communication area;
and step 3: establishing a coordinate system of the advertisement words for the two-dimensional graph of the advertisement words, wherein the coordinate system of the advertisement words takes a central line of the words from top to bottom as a y-axis, and the bottom edges of the words or a vector passing through the bottoms of the words as an x-axis; judging whether the y-axis direction of the coordinate system of the advertisement words is parallel to or coincident with the y-axis direction of the world coordinate system of the graphic software, if so, acquiring the height of the two-dimensional graphic in the y-axis direction; if not, enabling the y axis of the coordinate system of the advertisement character to be parallel to or coincident with the y axis of the world coordinate system, and calculating the height of the rotated two-dimensional graph on the y axis;
and 4, step 4: inputting the inclination angle theta, the front end height H1 and the initial rear end height H20 of the top surface of the advertising character, and checking the rear end height H2 according to the height H, the inclination angle theta and the front end height H1; maximum trailing end height H2max = H1+ H tan θ, if H20< H2max, then H2= H20; if H20> H2max, then a re-entry of H20 is required;
and 5: rotating the two-dimensional graph by an inclination angle theta by taking an x axis of a coordinate system of the advertisement word as a rotating axis, and taking a plane where the rotated two-dimensional outline is positioned as a first reference plane;
step 6: translating the two-dimensional graph upwards along the normal direction of the first reference surface by a translation distance H1 to obtain a first contour group S1, and taking the plane of the first contour group S1 as a second reference surface;
and 7: translating the first contour group S1 downwards along the normal direction of the second reference plane by an offset distance H2 to obtain a second contour group S2;
and 8: projecting the first contour set S1 along an XOY plane normal to the first reference plane to obtain a third contour set S3;
and step 9: the first contour group S1 is the shape of the top surface of the character, the shape of the bottom surface and the shape of the side surface of the character are obtained by S2 and S3;
in step 9, the specific method for calculating the bottom surface of the advertisement word is as follows:
step 9-1-A: obtaining an intersection line L of the second contour group S2 and the third contour group S3;
step 9-1-B: the second contour group S2 and the third contour group S3 are segmented with the intersecting line L: for S2, delete the area below the intersection L, resulting in S2'; for S3, delete the area above the intersection L, resulting in S3';
step 9-1-C: the bottom surface of the advertisement word is formed by S2 'and S3';
in step 9, the specific method for calculating the side of the advertisement word is as follows:
step 9-2-1: reading all closed contours in a first contour group S1, wherein each closed contour corresponds to a side figure, and taking any closed contour as a current closed contour;
step 9-2-2: obtaining the perimeter of the current closed contour, dispersing the current closed contour with the same sampling precision, numbering sampling points on the current closed contour in sequence, projecting discrete points on the current closed contour to the bottom surface, and obtaining the distance value between the discrete points on the current closed contour and the projected points; storing the serial numbers and the distance values of the sampling points;
step 9-2-3: the sampling points on the horizontal line are numbered according to the sequence of the sampling points of the current closed contour, and the sampling points of the horizontal line correspond to the sampling points of the current closed contour one by one; acquiring a corresponding point which is vertical to the sampling point and has a distance value with the sampling point for each sampling point on a horizontal line, wherein all the corresponding points are positioned above the horizontal line or below the horizontal line simultaneously, connecting all the corresponding points in turn to form a line, connecting a first sampling point and the corresponding point thereof, connecting a last sampling point and the corresponding point thereof, and forming a plane expansion pattern of the side surface of the current closed contour by the horizontal line, the connecting line of the first sampling point and the corresponding point thereof, the connecting line of the last sampling point and the corresponding point thereof and the connecting line of all the corresponding points;
step 9-2-4: judging whether the current closed contour is the last closed contour of the first contour group S1, if so, outputting the obtained plane expanded graph of the side face; if not, taking the next closed contour as the current closed contour, and repeating the steps 9-2-2 to 9-2-4.
2. The method of generating a three-dimensional metal advertising word model of claim 1, wherein: step 2, obtaining the entity area of the advertisement word comprises the following steps:
step 2-1: judging the number of connected areas in the two-dimensional graphic file, and if only one connected area exists, taking the connected area as the current connected area; if two or more communicated areas exist, one communicated area is selected as the current communicated area;
2-2: judging whether the number of closed polygons in the current communication area is greater than 1, if so, entering the step 2-3; if not, entering the step 2-4;
step 2-3: grouping closed polygons in the current communication area according to the inclusion and contained relations, and determining an entity area of the advertisement words;
step 2-4: taking the area surrounded by the unique closed polygons as an entity area of the advertisement words;
step 2-5: judging whether the current connected region is the last connected region, if so, outputting all the entity regions, and entering the step 3; if not, taking the next connected region as the current connected region, and repeating the steps 2-2 to 2-4.
3. The method of generating a three-dimensional metal advertisement word model of claim 2, wherein: the specific method for grouping the closed polygons in the step 2-3 comprises the following steps:
step 2-3-1: numbering closed polygons in a current communication region from outside to inside in sequence to be 1,2, …, i, …, N, wherein N is the total number of the closed polygons; the ith closed polygon is contained within the (i-1) th closed polygon; closed polygons which are contained in the same closed polygon but have no containing and contained relationship with each other use the same number;
step 2-3-2: the jth and jth-1 closed polygons are organized into a group, j is an even number, and j starts from 2; or j is odd, j starting from 1;
step 2-3-3: the area enclosed by the closed polygons of each group is the solid area of the advertisement word.
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| CN110111425B (en) * | 2019-05-07 | 2023-02-24 | 厦门稿定股份有限公司 | 3D font oblique angle generation method, medium, device and apparatus |
| CN112085832B (en) * | 2020-08-12 | 2021-11-02 | 浙江闪铸三维科技有限公司 | Advertisement word 3D model generation method |
| CN113362427B (en) * | 2021-06-29 | 2024-03-15 | 深圳市创想三维科技股份有限公司 | Contour generation method, device, computer equipment and medium for hypotenuse three-dimensional word |
| CN115278080A (en) * | 2022-07-28 | 2022-11-01 | 北京五八信息技术有限公司 | Mask generation method, mask generation equipment and storage medium |
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