3D Virtual Object Viewpoint Control via Distance-Adaptive Path Switching
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Solution Overview
Problem
Controlling the viewpoint of a 3D virtual object in computer graphics is complex for novice users, as they need to manage three independent inputs to control a six-dimensional viewpoint, leading to user disorientation when navigating the object.
Innovation Solution
A method that constrains the view of a 3D virtual object based on a given distance from its surface, switching between rotational and translational paths, with the rotational path used for distances greater than a threshold and a translational path for closer distances, ensuring intuitive navigation and maintaining the object in the user's line-of-sight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If users control the viewpoint of a 3D virtual object using three independent inputs, then the viewpoint can be precisely positioned in six-dimensional space, but the operation becomes complex and causes user disorientation
Solution Approach 1:
The system dynamically changes the operational parameters of viewpoint control based on the current viewing distance. When the user is far from the object, the viewpoint moves along a spherical path allowing broad navigation. When the user zooms in close to the object, the path transitions to an elliptical shape that constrains movement to prevent the viewpoint from entering the object, thus adapting the control behavior to the viewing context and maintaining both precision and ease of operation.
Solution Approach 2:
The viewpoint control system transitions from a static control model to a dynamic one where the allowable movement path changes continuously based on viewing distance. The system dynamically adjusts the constraint geometry (from spherical to elliptical) and updates the valid viewpoint region in real-time, making the control system adaptable to different viewing scenarios and reducing user cognitive load.
2Adaptability or versatility
If the viewpoint distance from the object surface is not constrained, then users have freedom to navigate anywhere, but the viewpoint may enter the object causing disorientation
Solution Approach 1:
The system changes the geometric parameters of the viewpoint constraint based on viewing distance. At larger distances, a spherical path provides freedom of movement. At closer distances, the path transforms into an ellipse that automatically excludes the object volume, ensuring the viewpoint remains in valid external space while preserving navigation freedom within acceptable bounds.
Solution Approach 2:
The patent introduces an intermediate geometric construct (the constrained path and valid viewpoint region) that mediates between user navigation freedom and object boundary constraints. This intermediary structure automatically prevents viewpoint entry into the object while guiding movement along acceptable paths, resolving the conflict between freedom and reliability.
3Adaptability or versatility
If the viewpoint moves freely in three-dimensional space, then comprehensive viewing is possible, but the system complexity increases due to six-dimensional control requirements
Solution Approach 1:
The system reduces complexity by changing the degrees of freedom based on viewing distance. Far from the object, the spherical path allows three-dimensional movement. Close to the object, the elliptical constraint reduces effective degrees of freedom by preventing inward movement, thus simplifying the control problem while maintaining comprehensive viewing capability through contextual adaptation.
Data Source
AI summary
Instructions indicative of changing a view of a virtual object may be received by a device. At least a portion of the virtual object may be viewable from a viewpoint that is at a given distance from a surface of the virtual object. The device may cause a change of the view along a rotational path around the virtual object in response to the receipt of the instructions based on the given distance being greater than a threshold distance. The device may cause a change of the view along a translational path indicative of a shape of the surface of the virtual object in response to the receipt of the instructions based on the given distance being less than the threshold distance.