Volumetric Rendering for Atmospheric Effects in Flight Sim
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Solution Overview
Problem
Traditional polygon-based graphics systems struggle to accurately simulate volumetric weather effects and obscurants like rain squalls, fog, and clouds, leading to unrealistic visual cues in flight simulation and other applications, which can negatively impact training and immersion.
Innovation Solution
A computerized method and system for rendering graphical images that define volumetric objects as volumes composed of polygons, where the volume characteristics are combined with global characteristics based on the extent of intersection with view rays, allowing for more accurate representation of regional and volumetric objects, such as weather effects, by using dedicated buffers to store visibility attributes and rendering each pixel's view ray against the volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If global fog density is increased to simulate rain squall, then visibility within the rain squall region is reduced, but clarity of the entire scene is reduced causing objects outside the rain squall to become less visible than they should be
Solution Approach 1:
The patent applies local quality by implementing region-specific volumetric fog characteristics that allow different visibility parameters for different spatial regions. The rain squall region has high fog density for reduced visibility, while regions outside maintain normal visibility, thus achieving accurate local weather simulation without compromising overall scene clarity.
Solution Approach 2:
The patent segments the scene into multiple volumetric regions, each with independent fog density and visibility characteristics. By dividing the global scene into region-specific volumes (rain squall, cloud, fog regions), the system can apply selective visibility reduction only where needed, preventing global degradation of scene clarity.
2Ease of manufacture
If traditional polygon-based graphics systems are used to simulate weather effects, then implementation is simple, but the visual realism and accuracy of volumetric objects are insufficient
Solution Approach 1:
The patent transitions from traditional polygon-based graphics to a volumetric rendering system that uses density parameters, extinction coefficients, and scattering parameters to describe weather effects. This parameter change enables realistic volumetric representation of rain squalls, clouds, and fog while maintaining computational feasibility through efficient rendering algorithms.
3Measurement precision
If volumetric rendering with regional characteristics is implemented, then visual fidelity and realism are improved, but computational complexity increases
Solution Approach 1:
The patent segments the rendering process into distinct stages: defining volumetric regions with specific characteristics, calculating view ray intersections with these regions, and applying appropriate fog density and visibility adjustments. This segmentation manages computational complexity by breaking down the complex volumetric rendering task into manageable, modular operations.
Solution Approach 2:
The patent introduces dedicated volumetric buffers as intermediary data structures that store region definitions, density parameters, and intersection information. These buffers act as mediators between the scene geometry and the rendering pipeline, organizing complex volumetric data in a way that simplifies subsequent processing and improves rendering efficiency.
Data Source
AI summary
A computerized method and system of rendering a graphical image containing a volumetric object on an electronic display is provided. The method includes defining, at a processing circuit, the volumetric object as a volume. The volume comprises a plurality of polygons. The method includes rendering the volume for a first plurality of pixels of the electronic display. The volume is described by volume characteristics. The method includes rendering a graphical image for a second plurality of pixels of the electronic display. The graphical image is described by global characteristics. When a view ray for at least one of the second plurality of pixels intersects at least one of the first plurality of pixels, the global characteristics and a proportion of the volume characteristics are combined when rendering the graphical image. The proportion is defined by an extent of the intersection of the view ray.