HyShare: Hybrid Sample and Shading Reuse for Real-time Photorealistic Rendering

Real-time path tracing is computationally expensive due to intensive path sampling and shading, especially under high frame rate and high resolution demands. We present HyShare, a hybrid reuse algorithm that integrates ReSTIR-style path sample reuse with adaptive shading reuse across spatial and temporal domains. Unlike prior methods that treat reuse in isolation, HyShare jointly optimizes both reuse types, addressing their interdependencies while maintaining image fidelity. To prevent artifacts caused by stale data and correlation, we introduce per-pixel validation and dynamic refresh mechanisms. Our system adaptively disables reuse in motion-sensitive regions using radiance and geometric change checks. Evaluated on complex dynamic scenes, HyShare outperforms state-of-the-art baselines-including ReSTIR DI, ReSTIR PT, and Area ReSTIR-improving rendering speed by 37.4% and boosting image quality (PSNR +1.8 dB, SSIM +0.17). These results demonstrate the effectiveness and generalizability of HyShare in advancing real-time photorealistic rendering.