Flow - Light
這大概是我苦惱、處理了最久的效果，來回改了應該有10回合吧。
現代的 3D 引擎下加持，比起 Ray Marching 來計算光影，體積光和體積霧，應該可以弄出很有趣的東西，至少我一開始是這麼想的，不過實際弄起來才發現困難重重。
主要的障礙是，其實體積霧的運算很吃效能，要在霧裡透光的效果，結果鏡頭一拉遠，霧就變成可怕的方格...
另外，因為想要鏡頭可以運動時，不斷的穿梭在光與霧的組合，但實際上發現運動組合起來非常奇怪，最後加上了一點運動上的延遲，以及計算鏡頭移動時，光霧組合自動根據鏡頭計算新的運動路徑，才讓效果看起來正常一點（終於）
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