3D Sketching Gesture Integration for CAD Precision
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Solution Overview
Problem
Conventional CAD techniques face challenges in accurately and efficiently generating models of complex 3D objects, as 2D sketching requires multiple views and lacks precision, while 3D sketching lacks the necessary constraints for detailed geometry description.
Innovation Solution
A computer-implemented method that integrates free-form gestures for capturing 3D depths and constrained gestures on a 2D physical surface to generate precise models, combining 3D surface patches and 2D curves to describe complex geometries effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If 2D sketching is used to generate 3D models, then the process is simplified and easier to operate, but the precision and accuracy of 3D depth representation deteriorates
Solution Approach 1:
The patent transitions from 2D sketching to 3D sketching by enabling users to perform gestures in mid-air space. The 3D input subsystem captures spatial coordinates (x, y, z) and gesture orientations, allowing users to directly convey 3D depths and complex geometries through natural hand movements in three-dimensional space, thereby resolving the precision limitation of 2D sketching.
Solution Approach 2:
The patent introduces a canvas as an intermediary between the user's 3D gestures and the final 3D model. The canvas provides a virtual drawing surface that constrains and supports gestures, enabling precise geometry description while maintaining ease of operation. The canvas acts as a mediator that translates free-form 3D gestures into structured geometric data.
2Measurement precision
If 3D sketching is used to generate 3D models, then the precision of 3D depth representation is improved, but the ease of operation and gesture control deteriorates
Solution Approach 1:
The canvas serves as a virtual intermediary that provides gesture constraints and support in mid-air space. It defines a working plane and boundary conditions that guide user gestures, making 3D sketching more controllable and easier to operate while maintaining the precision benefits of 3D input.
Solution Approach 2:
The system dynamically adjusts gesture recognition parameters and constraints based on the canvas configuration. By modifying the parameter space for gesture interpretation (such as constraining movements to specific planes or directions), the system makes 3D gesturing more intuitive and easier to control without sacrificing precision.
3Loss of information
If multiple 2D sketches from disparate viewpoints are used to represent complex 3D objects, then the completeness of geometry description is improved, but the time required and process complexity increases
Solution Approach 1:
The patent enables direct 3D geometry description through mid-air gestures, allowing users to capture complex 3D objects from multiple viewpoints simultaneously in a single continuous gesture sequence. This eliminates the need to create separate 2D sketches for different views, significantly reducing the time and complexity while maintaining complete geometry information.
Solution Approach 2:
The system merges multiple viewpoint information into a unified 3D model through continuous 3D gesture input. Instead of creating separate 2D sketches that need to be integrated, the user directly traces the 3D object's geometry in space, and the system combines all spatial information into a single coherent 3D representation, reducing both time and process complexity.
Data Source
AI summary
In various embodiments, a sketching application generates models of three-dimensional (3D) objects. In operation, the sketching application generates a first virtual geometry based on a first free-form gesture. Subsequently, the sketching application generates a second virtual geometry based on a first constrained gesture associated with a two-dimensional (2D) physical surface. The sketching application then generates a model of a 3D object based on the first virtual geometry and the second virtual geometry. Advantageously, because the sketching application generates virtual geometries based on a combination of free-form and constrained gestures, the sketching application efficiently generates accurate models of detailed 3D objects.