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Attach Mask Expansion to a limited Slider Expression Control
Hey guys!
I have a circle going up and down in a cycle. It goes from 300 to 460 in Y position
I also have a solid with a circle mask so it can be the shadow of that circle.
So… I want the Mask Expansion to grow and and go back to it original size but controlled by the Circle 1 layer proximity to the shadow. I can’t figure it out…
I was thinking in a Slider Control that is controlled by the Circle 1 Y Position so I can attach the Mask Expansion it but the value is huge (300to460) and the value that worked for me was -6to-19 for the mask expansion.
I was wondering if there is a way to convert the Y Position to %, so 300 can be 0% and 460 can be 100% and then use another slider control for the mask expansion converter to %, that way -6 can be 100% and -19 can be 0%. The would give me the liberty to use the sliders in % so the value can oscillate from a determined range (in this case -6to-19).
I can do this in kayframes but I want more liberty on the animation.
Can anybody help me?
Thanks!
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2 Replies
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You could do it directly, like this:
y = thisComp.layer(“Circle 1”).transform.yPosition;
linear(y,300,460,-9,-19)However you do it, linear() is the key to transforming one range to another.
Dan
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Wow! It worked! Thanks! ?
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