做粒子特效的時候，水平隨機速度(random horizontal)是很常見的設定。例如shockwave或blast都需要這樣的速度類型。
PFlow的Speed operator可以輕易地做到Random Horizontal，因為內建就有這個選項，在thinkingParticles中，則需要額外的設置。
在tP中，只要做出如上的串接就可產生水平隨機速度。
取出粒子的Velocity資訊後，乘以(1,1,0)的向量。
再接上一個Velocity的operator，取代速度，這樣就可以產生隨機水平速度了!
1 comment:
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