This project focuses on the integration of advanced volumetric rendering within a proprietary deferred rendering pipeline. By moving beyond traditional game rasterization, it implements a custom raymarching engine capable of real-time simulation of complex, procedurally generated 3D volumes, such as clouds or volumetric gases, directly within the game environment.
The system functions as an injected shader pass that replaces traditional geometric processing for specific volumetric entities. It operates by executing a raymarching loop within a fragment shader, casting rays from the camera into 3D space for every pixel. As the rays march through the scene, the engine samples a procedural density field to determine light accumulation, surface normals, and depth-informed shading.
To maintain technical parity with the host game's lighting system, the engine derives normals through gradient analysis of the density fields. This allows the volumes to dynamically respond to light sources and atmospheric shifts. The implementation requires precise pipeline orchestration, involving the synchronization of the game's depth-testing, frame-buffer handoffs, and final compositing stages. This approach successfully renders non-Euclidean geometry in real-time, demonstrating the high level of control required over GPU architecture and buffer management when extending a rigid rendering pipeline.
