Virtual Drafting Tools for CAD Tactile Interaction
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Solution Overview
Problem
Computer-aided design (CAD) systems lack the tactile interaction and residual presence of traditional physical drafting tools, such as residual ink or indented paper, which are useful for reworking designs.
Innovation Solution
The implementation of virtual drafting tools that mimic traditional physical tools, allowing gesture and tactile interaction, and providing visible erased data to recreate the residual presence of physical drafting, enabling designers to restore erased curves and trace over them, with features like guide edges, masked areas, and influence bands to manage ink placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional physical drafting tools are used, then tactile interaction and residual presence (ink, indented paper) are provided, but the system lacks the precision and automation of modern CAD systems
Solution Approach 1:
The patent creates virtual copies of physical drafting tools (T-square, triangles, protractors, compasses) that replicate their tactile interaction characteristics in a digital environment. These virtual tools maintain the visual appearance, behavior, and interaction patterns of their physical counterparts while operating within a precise CAD system framework, allowing designers to experience tactile feedback through visual cues and cursor interaction.
Solution Approach 2:
The patent replaces the mechanical physical drafting system with a digital virtual tool system that uses software algorithms to simulate physical tool behavior. The virtual tools use computational geometry and coordinate systems to achieve precise geometric modeling while maintaining the operational characteristics of physical tools through digital interaction interfaces.
2Loss of information
If traditional physical drafting tools are used, then residual data (ink, indented paper) is naturally retained for reworking, but the system lacks data management and restoration capabilities
Solution Approach 1:
The patent creates virtual representations of erased data that replicate the visual appearance of residual ink or indented paper. These virtual erased elements are stored as editable digital objects that can be recovered, restored, or manipulated, providing both the visual feedback of traditional drafting and the data management capabilities of digital systems.
Solution Approach 2:
The patent implements a virtual eraser tool that can remove elements from the drawing while preserving them in a recoverable state. The erased data is not permanently deleted but stored as virtual residual information that can be restored to its original state or used as a basis for further design work, combining the irreversibility of physical erasing with the recoverability of digital data.
3Manufacturing precision
If virtual drafting tools are implemented, then CAD precision and automation are maintained, but tactile interaction and residual presence are lost
Solution Approach 1:
The patent uses visual appearance changes to simulate tactile feedback and residual presence. Virtual tools and erased elements incorporate visual properties (color, transparency, shading) that change based on their state, providing visual cues that mimic the tactile and visual feedback of physical tools. Erased elements display visual characteristics similar to residual ink or paper indentations.
Solution Approach 2:
The patent creates visual copies of physical tool characteristics, including the appearance of tool edges, guides, and erased marks. These virtual representations replicate the visual and interactive properties of physical tools, allowing users to interact with them through the graphical user interface in a manner that simulates tactile engagement.
4Adaptability or versatility
If virtual erased data is provided, then residual presence is recreated for reworking, but the system complexity increases
Solution Approach 1:
The patent creates a multi-functional virtual eraser tool that combines several capabilities: erasing elements from the drawing, preserving erased data as virtual residual information, allowing restoration of erased elements, and enabling tracing over erased paths. This single virtual tool performs multiple functions that would otherwise require separate tools or processes, reducing overall system complexity while enhancing design reworking capabilities.
Solution Approach 2:
The patent merges the functions of physical erasing, residual mark creation, and data preservation into a single virtual erasing operation. The virtual eraser simultaneously removes elements from the active drawing while creating recoverable virtual residual data, combining what would be separate physical processes (erasing and preserving) into one integrated digital operation.
Data Source
AI summary
Various disclosed embodiments include methods and systems for creating a virtual geometric model. According to disclosed embodiments, a data processing system for creating a virtual geometric model includes at least one processor and a memory connected to the processor. The data processing system is configured to generate a virtual drafting tool and a virtual marking device. The data processing system is configured to position the virtual drafting tool on a page and to position the virtual marking device relative to the virtual drafting tool. The data processing system is configured to draw the geometric model on the page by laying down ink by the virtual marking device using the virtual drafting tool and to store the geometric model in the memory.