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how to read a value using an expression ?
Let me explain,
if you have something like the opacity driven by an expression:transform.opacity=value*100
The result is the value of the opacity multiplied by 100, right.
Now I would like in an other expression (transform.position) to read the original value of the opacity! if I link position to opacity, the result is the whole expression of opacity …Is there a way to directly read the original value of the opacity ?
sebastien
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2 Replies
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If the pre-expression value isn’t animated, you can use a little trick where you use the opacity expression to stuff the pre-expression value into negative times, like this:
if (time >= 0) value*100 else value
Then you pick up that value like this:
transform.opacity.valueAtTime(-1)
If the pre-expression value is animated, you can still do it with something like this:
if (time >= 0) value*100 else valueAtTime(-time)
and pick up the value like this:
transform.opacity.valueAtTime(-time)
But you have to do a little extra work to pick up the pre-expression value at time = 0, if you need it. Anyway, that should give you the idea.
Dan
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the time reversed ! i love the idea…
always, so effective way Dan !thanks
sebastien
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