A CS2 smoke is a 32 × 32 × 32 voxel grid of 20-unit cells — 640 units per side — Morton-coded and networked in the demo itself, not a sphere and not a particle cloud. That is why a CS2 smoke pours down stairs and around corners: its shape is real occupancy data computed by the server, and it is recorded, so a replay can reproduce the exact volume that was on screen rather than approximate it with a ball.
Reverse engineered from raw demo bytes in July 2026 on current-build recordings; the rendering law decompiled from the current build's own shader package and the client binary (Linux libclient SHA 29ad0f8…).
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Most replay tools draw a CS2 smoke as a sphere because a sphere is what the entity looks like from the outside. The game does not work that way: the server computes which cells of a fixed grid are filled, and it networks that occupancy field. Reading it out of the demo bytes gives the exact shape the players saw — including the parts that flowed down a staircase or refused to fill a doorway.
The grid is fixed at 32 cells per axis with 20-unit cells, and cell indices are Morton-coded so that spatially close cells stay close in memory. Nothing about that is inferred: it was recovered by reading the raw frame data in the demo and validating the decode against rendered volumes.
The rendering side was taken from the game's own compiled pixel shader, decompiled and ported one-to-one rather than approximated, so the density falloff and lighting response are the game's and not a lookalike.
The most interesting single finding is what an HE does to a smoke. It is not a bullet capsule and not a generic disturbance — the client keeps a five-entry circular buffer of HE blasts and uploads their positions and times to the shader separately. Only samples within 250 units participate; the opened core is 200 units with a smoothstep feather out to 240; density in the hole drops to 2% rather than to nothing; and the hole closes on a smoothstep from 0.5 s to 5 s raised to the power 1.8, with the residual transient reaching zero at 7 seconds.
The grenade's flight, bounce and rest are reproduced tick-exactly on the current build. The delay between the projectile resting and the volume beginning to fill is not part of that gate and is not claimed.
Last updated 2026-07-14 — the date of the measurement, not of this page's rendering. What the confidence tiers mean. Memorin is not affiliated with or endorsed by Valve; Counter-Strike 2 is a trademark of Valve Corporation.