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Mechanical fan with expression
I made a mechanical fan whose blades start rotating and keeps the same speed after 1.5 seconds using AE at work.
Although I am still a novice at Expressions, I managed to make two versions of basically the same thing.Below is the expressions I made.
(to blades’ rotation)
1:non-split layer
if (time <= 1.5)
{
thisComp.layer(“null1”).effect(“Slider Control”)(“Slider”)
}
else
{
value + time*9002:split layer (in point is at 1.5 seconds)
this layer is split in two at 1.5 seconds and the expression is applied to the latter half.thisComp.layer(“wing01_01”).transform.rotation + (time- 1.5)*900
Although I managed to make it, I don’t understand why I needed to subtract 1.5 seconds in the latter parentheses in the second expression.
At first I did the opposite since the layer starts from 1.5 seconds.It might be pretty basic, but anyone care to explain?
Thanks in advance. -
2 Replies
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I think it might be a happy coincidence. If you wanted to make the rotation match the slider at the transition point, I think I’d do it like this:
s = thisComp.layer("null1").effect("Slider Control")("Slider");
tSwitch = 1.5;if (time <= tSwitch)
s.value
else
s.valueAtTime(tSwitch) + (time-tSwitch)*900
Dan
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Yes, it seems to be just a coincidence…
Thank you for the clearer and wiser expression.
It looks much more flexible.
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