Real-time 3D Volumetric Rendering via Particle Presorting
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Solution Overview
Problem
Traditional methods for rendering large three-dimensional volumetric models are computationally expensive and view-dependent, making real-time navigation and rendering on personal computers with typical graphics processors impractical, especially for models with emissive, occlusive, and translucent particles.
Innovation Solution
Presorting particles along a small number of predefined viewing directions allows for real-time rendering by enabling seamless navigation and image rendering without the need for continuous re-sorting, using distributed computing resources to perform presorting and rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous re-sorting of particles is performed for each view change, then rendering correctness is maintained, but computational cost becomes prohibitively expensive for real-time rendering
Solution Approach 1:
The patent applies preliminary action by pre-sorting particles along a fixed coordinate axis (e.g., z-axis) before rendering. This presorting is performed once and stored, eliminating the need for continuous re-sorting during view changes. The sorted particle data is then reused for multiple viewing angles, significantly reducing computational cost while maintaining acceptable rendering correctness for volumetric models.
Solution Approach 2:
The patent segments the particle sorting problem by dividing particles into discrete sortable entities along a fixed axis. Each particle is assigned a sort key based on its position along the fixed coordinate axis, creating independent sort segments that can be pre-computed and stored separately, enabling efficient retrieval without full re-sorting operations.
2Productivity
If GPU sorting and clustering approaches are used, then sorting speed is improved, but device complexity and resource requirements increase
Solution Approach 1:
The patent uses copying by creating a fixed-coordinate sorted representation of particle data that can be stored and reused. Instead of implementing complex GPU-based sorting algorithms, the system creates a simplified copy of particle data sorted along a fixed axis, which can be efficiently stored in memory and reused across multiple rendering operations without requiring specialized hardware sorting capabilities.
3Productivity
If presorting along fixed viewing directions is implemented, then real-time navigation is enabled, but adaptability to arbitrary view changes is reduced
Solution Approach 1:
The patent applies dynamics by enabling smooth transitions between different fixed-coordinate sorted representations. When the viewing direction changes significantly, the system can dynamically switch between pre-computed sorted datasets or interpolate between them, maintaining real-time performance while adapting to different viewing scenarios. This dynamic switching capability balances the trade-off between presorting efficiency and view adaptability.
Data Source
AI summary
Methods, devices, and computer-readable media that allow real-time rendering while navigating virtually about or through a digital 3-D volumetric model. Examples provide techniques to facilitate real-time rendering while navigating through and around the 3-D volumetric model that can have many thousands of particles, where the particles can have emissive, occlusive, and translucent properties. Such complex particles of the 3-D volumetric model are presorted along predefined viewing directions in order to enable real-time rendering from when a navigation control has been entered. Presorting of data may be performed at a processing device(s) located across a public or private network from a user's device on which the real-time rendering is performed.