As part of the effort to get myself familiar with Vulkan, I developed a real-time renderer featuring global illumination with RTX technique ¹. Aside from Dynamic Diffuse Global Illumination (DDGI) ², ray-traced soft shadow and specular reflections with spatio-temporal denoising (SVGF ³), I've also tried out some other …
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For visibility buffer rendering ^{1 2}, we cannot rely on the hardware rasterization and built-in functions in fragment shader to do the vertex attribute interpolation and implicitly compute partial derivatives (i.e. dFdx and dFdy in glsl). This article describes the math behind a simple way to analytically compute these …
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