Uploaded July 2026 | Updated September 2026, 7 hours ago

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In this line-by-line tutorial we build fully interactive fog in Unity from scratch. A single compute shader runs a lightweight density simulation that reacts to the player and static obstacles, using semi-Lagrangian advection and a simple mathematical velocity field. We then render it with a short ray-marching shader that turns the flat density texture into convincing volumetric fog. Along the way you’ll see practical techniques—ping-pong buffers, Beer-Lambert compositing, and object-space ray marching—that you can reuse in many other effects.

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▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬

0:00 Intro
0:44 Compute Shader
8:07 Fog Simulation Manager
12:19 Fog Volume Shader
16:37 Test
18:42 Fog Obstacles
20:48 Demo

*Source code:* gist.github.com/adammyhre/192275218a61156680e1186752418a1f

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