15 results about "Quadrilateral meshes" patented technology

A computer-implemented method and apparatus for generating a quadrilateral grid from an image with an alpha channel. The method includes receiving an image with an alpha channel depicting a shape mapped onto a 3D surface, vectorizing the shape to create a vector path, determining corners by calculating a centroid and identifying the points, correcting a winding order to ensure a clockwise orientation, constructing a quadrilateral grid by setting sub-paths based on detected corners, resampling the sub-paths to match specified rows and columns, performing weighted interpolation across the grid using inverse square distance weighting, and outputting the generated quadrilateral grid for display on a computer device. The apparatus comprises a processor configured to execute these steps, including vectorizing the shape, determining corners, correcting the winding order, constructing and resampling the grid, performing weighted interpolation, and subdividing the 3D mesh for flexible manipulation and extrapolation.

The application discloses a sum and difference beam optimization method of a cover array antenna, and comprises the following steps: creating an array antenna model and a cover array antenna model; performing quadrilateral mesh division on the models respectively; based on the corresponding quadrilateral mesh division of the models, performing simulation calculation by using a high-order moment method, and extracting corresponding active unit directional diagrams; applying excitation to the antenna units in the models, combining the active unit directional diagrams, calculating the sum and difference beams of the models under different scanning angles, and comparing corresponding performance indexes; and using an improved hybrid differential evolution algorithm to optimize the sum and difference beams of the cover array antenna model which does not meet the index requirements; wherein the improved hybrid differential evolution algorithm performs global and local iterative searches, and adaptively calculates a mutation factor and a crossover factor in the global and local iterative search processes. The application realizes the optimization design of the sum and difference beams of the cover array antenna, and is more in line with engineering application requirements.

The application discloses a structure surface grid automatic generation method based on topological filling, and relates to the technical field of aerospace engineering simulation and grid generation. The method comprises the following steps: intelligently dividing a three-dimensional CAD model into parts to obtain parts with semantic labels and geometric contours; sequentially performing ordered topological filling on each part according to a preset order, adjusting the number of intersection edge points of adjacent parts to ensure grid connection, and generating topological lines; projecting the topological lines onto the model surface for calibration; adaptively interpolating the projected topological lines based on model curvature and simulation conditions to generate point cloud data; generating an initial quadrilateral grid based on the point cloud; projecting the initial grid nodes onto the model surface again and optimizing the quality, and outputting the final grid. The application realizes end-to-end automatic generation from a CAD model to a high-quality surface grid, eliminates manual intervention, ensures the natural matching of grids between parts, and significantly improves the grid generation efficiency and quality.

This application relates to the technical field of 3D modeling methods and systems based on spatial hand-drawing and AI intelligent completion. Specifically, it discloses a 3D modeling method and system based on spatial hand-drawing and AI intelligent completion, aiming to solve the problems of complex operation, high learning threshold, and limited creative expression in traditional 3D modeling. The method includes: freely drawing spatial curves on a 3D canvas and then using AI to optimize smoothness; selecting a closed wireframe and triggering AI to intelligently repair gaps and generate quadrilateral mesh surfaces, providing multiple topology options for the user; based on geometric features and design context, AI automatically matches and generates suitable materials; finally, a lightweight neural rendering engine is called to quickly generate a preview image. By adopting the above technical solution, this application can achieve high-quality 3D modeling with minimal interaction, significantly reducing the usage threshold, improving the freedom of creative expression and modeling efficiency, while ensuring the topological regularity and rendering realism of the output model.

A computer-implemented method and apparatus for generating and refining synthetic images of customizable products. The method includes receiving a text prompt describing a product and a desired markup, generating a synthetic image using a generative AI system, validating the image against physical product specifications, mapping the image onto a 3D surface using quadrilateral grid interpolation, applying inpainting techniques to remove the markup while preserving fabric details, incorporating lighting and specular effects to enhance realism, and integrating the enhanced image into an interactive asset for user interaction and customization prior to manufacturing. The apparatus comprises a generative AI system, a validation and correction module, a 3D mapping and image synthesis module, an inpainting module, an interactive asset creation system, depth estimation and mapping tools, and a lighting and specular effects module. The system supports real-time customization and multiple design variations, ensuring conformity with physical specifications.

The invention discloses a structure surface grid automatic generation method based on topology filling, and relates to the technical field of aerospace engineering simulation and grid generation. The method comprises the following steps: carrying out intelligent component subdivision on a three-dimensional CAD model to obtain components with semantic tags and geometric contours of the components; sequentially executing ordered topology filling on each component according to a preset sequence, cooperatively adjusting intersection edge points of adjacent components to ensure grid connection, and generating a topological line; projecting the topological line to the surface of the model for calibration; performing adaptive interpolation on the projected topological line based on the model curvature and the simulation working condition to generate point cloud data; generating an initial quadrilateral grid based on the point cloud; the initial grid nodes are projected to the surface of the model again, quality optimization is carried out, and a final grid is output. According to the method, the end-to-end automatic generation from the CAD model to the high-quality surface grid is realized, the manual intervention is eliminated, the natural matching of the grids between the parts is ensured, and the grid generation efficiency and quality are remarkably improved.

This invention relates to the field of solid rocket motor technology, specifically to a method for strength analysis and modeling of solid rocket motor casings. The steps are as follows: S1, import the 3D model of the metal casing into ANSYS software; S2, perform a series of cutting, merging, and deleting operations on the 3D model to convert it into a 2D model; S3, assign material properties to the 2D model and divide it into quadrilateral meshes to obtain a 2D finite element model; S4, based on the coordinate characteristics of the geometric model, select the inner hole line numbers of the front and rear joints of the casing, and sequentially select the inner line groups of the casing according to "points attached to lines" and "lines associated with points," thereby determining the application position of the pressure load; S5, rotate the 2D finite element model by a certain angle to expand it into a 3D model; S6, after applying the pressure load, solve the problem and extract the equivalent stress to evaluate the structural strength of the metal casing. This invention reduces the difficulty of simulation, significantly improves work efficiency, and has good versatility.

This application discloses a method, device, and storage medium for generating vertical grids suitable for complex terrain, relating to the field of fluid numerical computation technology. The key technical points are: the method includes: acquiring topographic elevation data of the target terrain region; generating planar triangular or quadrilateral grids based on the topographic elevation data; defining the control water depth and grid layer number for several terrain feature control points; determining the critical water depth between deep and shallow water areas; calculating the characteristic values ​​and elevation values ​​of each grid point; performing local vertical subtraction to generate a series of characteristic values ​​and elevation values; and generating the vertical grid of the target terrain region based on the series of characteristic values ​​and elevation values ​​of each grid point. This generation method can adapt to complex underwater terrain and allocate appropriate vertical grid layers in deep and shallow water areas respectively, satisfying the requirements of vertical resolution while improving model computational efficiency and accuracy.

A computer-implemented method and apparatus for generating and refining synthetic images of customizable products. The method includes receiving a text prompt describing a product and a desired markup, generating a synthetic image using a generative Al system, validating the image against physical product specifications, mapping the image onto a 3D surface using quadrilateral grid interpolation, applying inpainting techniques to remove the markup while preserving fabric details, incorporating lighting and specular effects to enhance realism, and integrating the enhanced image into an interactive asset for user interaction and customization prior to manufacturing. The apparatus comprises a generative Al system, a validation and correction module, a 3D mapping and image synthesis module, an inpainting module, an interactive asset creation system, depth estimation and mapping tools, and a lighting and specular effects module. The system supports real-time customization and multiple design variations, ensuring conformity with physical specifications.

The system is designed to generate ordered quadrangular meshes for three-dimensional, non-canonical surfaces. It includes a partitioning unit that divides the input surface into quadrangular fragments. The system features a computational unit connected to the partitioning unit, which transforms each fragment into a topological square using form functions. A subdivision module, linked to the computational unit, assigns and applies different division numbers (n1, n2, n3, and n4) to each side of the square. This process results in various mesh forms, including square, rectangular, and quadrangular elements. The system further includes a mesh generation unit connected to the subdivision module, which constructs an ordered mesh composed of convex quadrangular elements. The generated mesh ensures that neighboring elements have comparable properties, and a triangular element is added if the sum of the division numbers is odd, ensuring consistency and structural integrity in the mesh.

The application discloses a kind of partition parameterization spherical shell body full hexahedron grid generation methods based on geological feature geometric constraint, it is related to CAE grid generation and numerical simulation pre-processing technical field, including: spherical shell geometry and radial stratification information, geological feature surface and its boundary element data import;Spherical surface partition and subdomain two-dimensional parameter domain construction, and generate parameter domain line constraint;Subdomain full quadrilateral grid generation based on line constraint;Subdomain grid inverse mapping and overall spherical grid generation;Radial stratification control and radial sweep generate spherical shell body full hexahedron grid and output.The application constructs the integration process of geological feature geometric constraint, partition parameterization and full hexahedron body grid generation, can obtain the topologically consistent spherical shell body full quadrilateral surface grid and generate spherical shell body full hexahedron body grid under complex linear geological constraint, overcome the limitation that overall parameterization is easy to produce projection singularity and scale distortion in polar region, grid is easy to degenerate and difficult to high-quality sectioning.

The application discloses a quadrilateral mesh lightweight method, system, storage medium and equipment, the method is through receiving input grid, if the input grid is triangular mesh, then convert into initial quadrilateral mesh; taking the variance of the edge length and the diagonal length of the quadrilateral mesh as the equidistance optimization target, the initial quadrilateral mesh is iteratively optimized; in the iterative optimization process, the local operation set and the tangent space smoothing are executed collaboratively, so that the number of patches of the initial quadrilateral mesh is gradually reduced and the geometric structure is kept; the feature line reservation and the adaptive density control based on the user pre-defined density function are combined to reserve the geometric features and adjust the grid density of different regions; when the preset termination condition is met in the iterative optimization process, the target quadrilateral mesh after lightweight is output. The application improves the structure regularity and the geometric fidelity of the simplified grid, and effectively overcomes the mesh degradation problem caused by the traditional global folding method.

The application discloses a kind of discrete developable surface construction and optimization method, system, equipment and medium, the method includes: obtaining quadrilateral grid;According to quadrilateral grid, parallel quadrilateral cell in chessboard distribution is constructed inside quadrilateral grid, and establish developable surface geometric model;The constraint of developable surface geometric model includes: having the constraint of chessboard pattern with embedded parallel quadrilateral, equiangular constraint, shape similarity constraint and equidistance constraint;Developable surface geometric model is solved, and discrete developable surface with congruent parallel quadrilateral is obtained;The geometric feature of the discrete developable surface is encoded into uniform plane unit, so that each surface sheet can be processed and formed using the same machining parameter or the same mold set.The application significantly reduces the number of molds and manufacturing complexity, and improves the feasibility of engineering implementation.The application integrates the chessboard pattern construction, equiangular and equidistance geometric constraints and engineering solving process into the same technical system, realizes the complete engineering process from quadrilateral grid to discrete developable surface.The application is suitable for being applied to building curved surface structure and curtain wall unit design, deployable shell and foldable structure modeling, sheet bending and sheet metal forming design, engineering shell and cladding structure design, and assembly type structure manufacturing based on plane sheet, etc.

This invention relates to the field of data processing and discloses a method, apparatus, device, and storage medium for calculating the topological connection relationship of LED modules. The method for calculating the topological connection relationship of LED modules includes: generating a quadrilateral mesh for each module based on its starting point coordinates and width / height parameters, resulting in a module mesh set; initializing the topological data structure of each module based on the module mesh set, resulting in an initial topological container containing module numbers and vertex sets; performing a directional nearest neighbor search for each module in four directions based on the initial topological container, obtaining the nearest neighbor module information for each module in each direction; and performing an adjacency expansion search along a preset chain direction based on the nearest neighbor module information, obtaining the complete topological connection relationship of each module including all adjacent modules in the four directions. This invention improves the accuracy and expressive power of the topological structure in complex splicing scenarios.