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Spatial Multiple Importance Sampling for Real-Time Irradiance Probes
IEEE Transactions on Visualization and Computer Graphics
|March 3, 2026
Summary
This study introduces spatial multiple importance sampling to reduce flickering in real-time global illumination. The technique reuses ray-surface data for irradiance probes, significantly lowering variance and improving image stability in complex scenes.
Area of Science:
- Computer Graphics
- Real-time Rendering
- Computational Imaging
Background:
- Real-time global illumination rendering with low variance is a significant challenge.
- Current methods like irradiance probes often produce flickering artifacts due to computational budget constraints.
Purpose of the Study:
- To significantly reduce flicker artifacts in real-time global illumination rendering.
- To enable efficient computation in complex scenes under limited ray tracing budgets.
Main Methods:
- Proposing spatial multiple importance sampling (SMIS).
- Reusing ray-surface intersection data among real-time irradiance probes.
- Incorporating a probe selection mechanism and a visibility estimation method.
Main Results:
- Demonstrated significant reduction in rendering variance at a fixed ray tracing cost.
- Achieved high-quality, stable outputs in real-time scenarios.
- Enabled efficient computation in complex scenes.
Conclusions:
- Spatial multiple importance sampling effectively mitigates flicker artifacts caused by variance in real-time global illumination.
- The proposed method enhances probe reuse efficiency and reduces bias.
- This technique offers a viable solution for stable, high-quality real-time rendering.
