We present SDFDDGI, a novel approach to compute dynamic diffuse global illumination in real time using signed distance fields (SDF). For an input scene, we first construct its compact representation using SDF. Different from traditional SDF which are stored by discrete voxels, our approach approximates the scene by a set of simple primitive shapes, which facilitates real-time computation and dynamic changes. Then, we reconstruct the irradiance function in the space domain by discrete samples (referred to as probes), which are positioned heuristically for real-time performance. The probe irradiance can be updated and interpolated effectively supported by our compact SDF representation. Subsequently, a screen-space refinement method is developed to enhance rendering details and visual quality. We validate our approach by comparing the performance and quality of our method to other state-of-the-art real-time global illumination methods. Our approach is able to calculate real-time diffuse global illumination for both dynamic geometry and dynamic lighting efficiently without any precomputation, while also supporting multi-bounced light. It is also hardware free and can manage both large open scenes and indoor high-detailed scenes.

我们提出了 SDFDDGI，这是一种使用符号距离场 (SDF) 实时计算动态漫反射全局照明的新方法。对于输入场景，我们首先使用 SDF 构建其紧凑表示。与由离散体素存储的传统 SDF 不同，我们的方法通过一组简单的原始形状来近似场景，这有助于实时计算和动态变化。然后，我们通过离散样本（称为探针）重建空间域中的辐照度函数，这些样本被启发式定位以实现实时性能。我们紧凑的 SDF 表示可以有效地更新和插值探头辐照度。随后，开发了一种屏幕空间细化方法来增强渲染细节和视觉质量。我们通过将我们的方法的性能和质量与其他最先进的实时全局照明方法进行比较来验证我们的方法。我们的方法能够有效地计算动态几何和动态照明的实时漫反射全局照明，而无需任何预先计算，同时还支持多次反射光。它也是无硬件的，可以管理大型开放场景和室内高细节场景。