DDISH-GI: Dynamic Distributed Spherical Harmonics Global Illumination

Adaptive Dynamic Global Illumination

“…Probe based techniques also differ on how they store the information in the probes. Some use discrete textures [28,31] while other may use a compressed basis representation such as Spherical Harmonics [14,55]. Spherical harmonics implicitly pre-filters the content before storage but may cause light and dark ringing issues.…”

“…Bandwidth is also crucial for cloud streaming of probe data. In such scenarios, Spherical Harmonics [14] representation may be preferable as they provide excellent compression for low frequency data. At run-time, dynamic probe based [28] GI solutions uniformly distributes rays across probes to update their content; this quickly becomes a bottleneck as the number of probes increases.…”

“…However, the prospect of training a neural network, the added complexity of integrating machine learning inference with traditional graphics pipeline, and the proprietary nature of machine learning frameworks have stalled the industry-wide adoption of these techniques. The recent probe-based algorithm, Dynamic Diffuse Global Illumination (DDGI) [28], extending the classic irradiance probes, still remains an excellent choice due to its relative simplicity, quality, and cloud streaming capabilities [14,53]. However, scaling of DDGI in its original formulation is limited, and approaches such as multi-grid hierarchy and probe rolling [29] are necessary to scale it across large environments.…”

Tauray: A Scalable Real-Time Open-Source Path Tracer for Stereo and Light Field Displays

“…While Tauray supports many rendering modes for debugging, dataset generation and comparison purposes, its primary focus is on methods aiming for photorealism: a forward path tracer and DDISH-GI [Ikkala et al 2021] are available. Both methods use the crossvendor Vulkan extensions VK_KHR_ray_tracing_pipeline and VK_KHR_acceleration_structure for ray tracing.…”

“…Tauray focuses on using ray tracing techniques for generating real-time content for multi-view displays, such as VR headsets and light field displays. It includes multiple different rendering modes, such as forward path tracing and DDISH-GI [Ikkala et al 2021], and supports using multiple GPUs.…”