Adaptive VR Volume Rendering for Motion Sickness Reduction
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Solution Overview
Problem
Current virtual reality rendering technologies face challenges in achieving high visual fidelity and performance, particularly in virtual reality environments with variable three-dimensional features, leading to increased costs, size, and user discomfort due to motion sickness and judder effects.
Innovation Solution
The implementation of direct volume rendering using Monte Carlo integration, adaptive rendering parameters based on user motion, and efficient data processing techniques such as empty space skipping and ray-casting acceleration structures to balance image quality and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If volume rendering is used to achieve high visual fidelity, then image quality is improved, but rendering performance deteriorates
Solution Approach 1:
The patent implements adaptive rendering that dynamically adjusts rendering parameters based on detected user motion. When the user is stationary, the system uses high-quality volume rendering with full sampling. When motion is detected, the system reduces rendering complexity and sampling density to maintain frame rate, thus resolving the contradiction between image quality and rendering performance through real-time adaptation to user behavior
Solution Approach 2:
The system changes rendering parameters (such as sampling density, ray casting complexity, and rendering resolution) based on user motion state. By adjusting these parameters dynamically, the system maintains high visual fidelity when needed while improving rendering performance during motion, effectively resolving the trade-off between image quality and rendering speed
2Manufacturing precision
If stereo rendering is implemented for virtual reality, then visual realism is improved, but computing resource demand increases
Solution Approach 1:
The patent applies adaptive rendering to stereo VR by detecting user motion and dynamically adjusting the rendering complexity for each eye's view. When the user is stationary, full-quality stereo rendering is performed. When motion is detected, the system reduces rendering complexity while maintaining stereo separation, thus achieving visual realism with reduced computing resource demand through motion-based adaptation
Solution Approach 2:
The system performs partial rendering by reducing the sampling density and rendering complexity for stereo views when user motion is detected. Instead of rendering both stereo images at full quality during motion, the system uses reduced-quality rendering for one or both eyes, maintaining the essential stereo effect while significantly reducing computing resource consumption
3Ease of operation
If high frame refresh rate is maintained to prevent motion sickness, then user comfort is improved, but rendering complexity must be reduced
Solution Approach 1:
The patent implements a feedback loop where user motion is continuously detected and used to adjust rendering parameters in real-time. This feedback mechanism allows the system to maintain high frame rates by reducing rendering complexity only when necessary (during motion), while preserving rendering quality during stationary periods, thus achieving user comfort without permanently sacrificing visual fidelity
Solution Approach 2:
The system periodically assesses user motion state and adjusts rendering complexity accordingly. By alternating between high-quality rendering (when stationary) and reduced-complexity rendering (when moving), the system maintains high frame rates during motion while preserving visual fidelity during stationary periods, effectively managing the trade-off through periodic adaptation
Data Source
AI summary
A method for rendering an image in a virtual reality environment includes capturing volume data with a capturing device, storing the volume data in a memory, detecting a movement of a user with a tracking device, generating tracking data representing the movement of the user, setting rendering parameters for rendering the image, rendering the image from the volume data based on the rendering parameters, detecting a measure of the movement of the user based on the tracking data, and adapting the rendering parameters depending on the measure of the movement of the user. A system for rendering the image includes a tracking device, a communication interface, a memory, and a processor which sets rendering parameters, renders the image from the volume data based on the rendering parameters, detects a measure of the movement of the user, and adapts the rendering parameters depending on the measure of the movement.