3D Model Gap Reduction via 2D Sketch Geometry Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for inferring three-dimensional geometry from two-dimensional sketches often result in gaps due to poor sizing or incorrect relationships, particularly when connecting new geometry to existing models, leading to poor alignments and geometric properties in the 3D model.
Innovation Solution
Modifying two-dimensional constraints rather than three-dimensional constraints to alter the geometry in the 2D input plane, allowing for adjustments in the x and y dimensions to reduce gaps, rather than solely modifying the 3D model's view direction (z dimension), thereby improving the accuracy of 3D inference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If three-dimensional constraints are modified to reduce gaps in the 3D model, then gap reduction is achieved, but alignments, angles, and other geometric properties deteriorate
Solution Approach 1:
Instead of modifying 3D constraints to reduce gaps (which compromises alignment accuracy), the patent inverts the approach by modifying the 2D sketch geometry itself. The system adjusts the 2D positions, lengths, and angles of sketch elements so that when 3D constraints are applied, the resulting 3D model has both reduced gaps and maintained alignment accuracy. This inversion of the modification target resolves the contradiction between gap reduction and geometric property preservation.
2Manufacturing precision
If the 3D geometry is refined to close gaps, then gap closure is improved, but the original 2D sketch geometry is altered in an unintended way
Solution Approach 1:
The patent applies preliminary action by modifying the 2D sketch geometry before applying 3D constraints, rather than correcting gaps after 3D modeling is complete. The system pre-adjusts the 2D positions, lengths, and angles of sketch elements to ensure that when 3D constraints are applied, the resulting model has minimal gaps while preserving the intended 2D geometry. This preliminary modification of the 2D input prevents information loss and maintains fidelity to the original sketch intent.
3Adaptability or versatility
If end points of curves are modeled separately in 3D, then flexibility in 3D constraint solving is improved, but gaps appear at connection points
Solution Approach 1:
The patent applies local quality by making targeted modifications to specific 2D sketch elements (lines, curves, and their connection points) rather than uniformly adjusting the entire sketch. The system identifies local geometric properties such as lengths, angles, and positions of individual sketch elements and adjusts only those specific properties to ensure proper 3D connection. This localized modification approach maintains the flexibility needed for 3D constraint solving while ensuring accurate connections between model elements.
Data Source
AI summary
A three-dimensional model is determined from a two-dimensional sketch. Rather than or in addition to modification of 3D constraints to reduce gaps in the 3D model, 2D constraints are modified. The geometry of the 2D sketch is altered in the view plane (x, y) or 2D input instead of maintaining the geometry of the 2D sketch and only modifying in the view direction (z). Gaps may be reduced through alteration of the 2D geometry.