Lofted Surface Modification via 2D Cross Section Extraction
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Solution Overview
Problem
Existing CAD systems face challenges in modifying lofted surfaces, as they require complex processes involving feature recipes and history maintenance, making it difficult to modify or convert unlofted surfaces into lofted ones, and existing deformation or morph tools often lose precise geometry measurements.
Innovation Solution
A loft tool that allows direct manipulation of 2D sections of lofted surfaces by converting u-v curves to x-y-z curves, simplifying them, and planarizing to generate 2D cross sections, enabling intuitive modification and creation of lofted surfaces from unlofted ones without relying on feature recipes or history data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If parametric modeling systems use feature recipes and history maintenance to create lofted surfaces, then the lofted surfaces can be created with precise geometry, but modifying the lofted surfaces becomes complex and time-consuming
Solution Approach 1:
The patent extracts the lofted surface geometry from its parametric feature recipe context, allowing the surface to be modified independently without requiring access to or regeneration of the original feature history. This separation enables direct geometric manipulation while maintaining precision.
Solution Approach 2:
Instead of modifying the lofted surface by editing its creation parameters through feature recipes, the patent inverts the approach by allowing direct modification of the surface geometry itself, then regenerating the loft from the modified geometry. This reverses the traditional parametric workflow.
2Reliability
If parametric systems require step-by-step feature creation and history maintenance, then design intent can be preserved, but the modification process requires rolling back changes and recreating features
Solution Approach 1:
The patent performs preliminary extraction of the lofted surface geometry and its defining characteristics before modification begins. This preliminary preparation stores the essential design information in a form that allows direct modification without requiring sequential regeneration of feature history.
Solution Approach 2:
The patent creates a copy or representation of the lofted surface geometry that can be modified independently. This copy contains the essential geometric information needed to maintain design intent while allowing flexible modification without affecting the original feature history.
3Adaptability or versatility
If users convert unlofted surfaces to lofted surfaces by deleting and recreating features, then the surface can be lofted, but the process is time-consuming and error-prone
Solution Approach 1:
The patent enables the unlofted surface to convert to a lofted surface automatically through a self-service process. The system analyzes the existing surface geometry, extracts the necessary loft parameters, and generates the lofted representation without requiring manual deletion and recreation of features by the user.
Solution Approach 2:
The patent creates a universal conversion process that can transform any unlofted surface into a lofted surface regardless of the original creation method. This multi-functional approach handles various surface types and loft configurations through a single integrated process rather than requiring separate feature recipes for each case.
Data Source
AI summary
A three-dimensional object modeling tool is described that can derive the 2D cross sections of one or more lofted or unlofted surfaces, allowing those surfaces to be modified instantly. The modeling tool (loft tool) includes sub-tools for selecting a surface, moving a 2D section, editing a 2D section, creating a 2D section, and removing a 2D section. By analysis of the selected lofted surface and its faces, the loft tool can derive an appropriate number of 2D cross section to present to the user for manipulation. When deriving the 2D cross section the modeling tool operates by simplifying the curves making up the lofted surface, and from these can generate 2D cross section that can be easily manipulated and used to instantly update the lofted surface and redisplay it for further user modification.