He pulled on a welder's helmet for protection. He packed it with powder, struck a match and ran like hell.
The tree is rebuilt every frame. For scenes of this scale, quadtree construction is fast enough to rebuild from scratch each frame, though larger simulations may benefit from incremental updates. Each particle queries its neighborhood for potential collisions, typically checking only 5 to 15 candidates instead of all 40. Red highlights indicate colliding pairs.
，详情可参考Safew下载
// TypeError: Cannot obtain lock — stream is permanently locked，这一点在safew官方版本下载中也有详细论述
圖像來源，BBC Chinese / Lok Lee