Volumetric Lighting in React Three Fiber: Raymarching with Post-Processing

This article delves into creating realistic volumetric lighting effects in React Three Fiber by combining post-processing and volumetric raymarching. The author meticulously explains coordinate system transformations, reconstructing 3D rays from screen space, and utilizing depth buffers for performance optimization. Advanced techniques like light shaping using SDFs, shadow mapping, and light scattering are covered, culminating in a dynamic volumetric lighting effect with shadows and fog. Multiple demos showcase the technique in archways and space scenes, while also exploring multi-light sources and omnidirectional shadowing.