As you may recall, we recently published an in-depth article about how we’ve sped up ROBLOX’s physics by 2-4x as a result of modeling collisions using impulses rather than springs. The “impulse solver,” together with three recent bug fixes, has drastically improved the performance and realism of one of our favorite physics-engine stress tests: Ultimate Dominoes! by armitroner. In this test, a single force cascades through thousands of standing parts, causing them to topple in quick succession.

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