Radiance transfer biclustering for real-time all-frequency biscale rendering.

Area of Science:

• Computer Graphics
• Rendering Algorithms
• Material Appearance

Background:

• Realistic rendering of materials requires accurate simulation of light transport (radiance transfer).
• Previous methods often struggle with real-time performance or high storage requirements for all-frequency effects.
• Bidirectional Texture Functions (BTFs) capture complex material appearance but are computationally intensive.

Purpose of the Study:

• To develop a real-time algorithm for rendering all-frequency radiance transfer at both macroscale and mesoscale.
• To reduce storage and runtime computation costs for realistic material rendering.
• To enable high-quality rendering of materials and shadows under complex lighting conditions.

Main Methods:

• A per-pixel integration of local incident radiance and bidirectional texture functions (BTFs) for mesoscale shading.
• Lossless compression of the macroscale radiance transfer matrix using a novel biclustering technique.
• Exploiting coherence and matrix properties for efficient storage and computation.

Main Results:

• The algorithm achieves real-time frame rates for rendering realistic materials and shadows.
• Images generated compare favorably with reference ray tracing results.
• Demonstrated advantages over alternative methods in storage and preprocessing time.

Conclusions:

• The proposed real-time algorithm effectively renders all-frequency radiance transfer at multiple scales.
• The novel biclustering technique significantly optimizes radiance transfer matrix compression.
• This method offers a practical solution for high-fidelity, real-time material and shadow rendering.