TAC Car Crash VFX Breakdown from Studio Blackbird
Studio Blackbird, an artist owned studio based out of Australia, produced a PSA for the Australian Transport Accident Commission, which depicts the results of a car accident at 7 different speeds, all in one camera move. (And they did crash some real cars!) The CG elements were lit with V-Ray and smoke with Mantra. First watch the spot, and then check out the breakdown to see their process.
See more of their work at their website, Studio Blackbird.