VFX · FX Sims
Smoke that lies: the art of FX simulation for narrative shots
Why “real” simulation rarely cuts as the right answer — and the heuristics we use instead.
01 · Why 'real' usually isn't
We've spent fifteen years simulating smoke, dust, fluids, and fire. The lesson we keep relearning: the simulation that looks the most physically correct rarely cuts as the right answer.
Narrative film doesn't want truth. It wants legibility — the audience needs to understand what the smoke is doing for the story, in the half-second it's on screen.
02 · Our heuristic stack
Before we touch a solver, we answer three questions: What is this FX in service of? What is the cut around it? How long is the shot on screen?
"Direction precedes simulation. Always."
— Jonas Riese, VFX Supervisor
03 · Cheating with intention
Almost every shot of ours that holds up under HDR scrutiny was cheated — animated curves on velocity, hand-painted density masks, a custom shader that breaks energy conservation on purpose.
04 · When we let the solver win
The exception: water. Water reads as wrong faster than any other element. There we run the high-res sim and accept the render budget.
