3ds Max stores time internally in integer units called Ticks.
One second always contains 4800 ticks, thus one Tick is defined as a 1/4800 th of a second.
4800 ticks per second / 24 frames per second (Movies) = 200 ticks per frame
4800 ticks per second / 25 frames per second (PAL TV) = 192 ticks per frame
4800 ticks per second / 30 frames per second (NTSC TV) = 160 ticks per frame
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20130719
Joe Scarr提到一點值得去注意。
設計TP system時，盡量不要在operator上去做value animation,
這樣會讓系統變得更為複雜；
雖然麻煩，但在中間穿插helper的方式可以一目瞭然，並且好調整。
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20130718
PPass, distance
vector運算模式為p2 -> p1的vector ，非p1 -> p2
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20130520
Object properties 'renderable' tag
if you concern putting object into TP system, you have to very careful not to turn them unrenderable in object properties. Or, it wont work in system.
group
通常，group 中的 rollout 會保持預設 global ;
代表整個system顯示設定由Master Dynamic node控制。
若需要獨立某group的顯示方式，那麼將該group顯示設定改為非global即可。
