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Text Y Position linked to null Y rotation
I have a series of text rotating through the screen in 3d space. as they rotate through i need the position at the start to be higher in “Y” and then when the finish the rotation I need them to be lower in “Y”.
The rotating text is linked to a null for the rotation value. I would like to create a script for the Y position in the text element so as the rotation changes in the null the Y position will change on the text.
This isn’t a direct link because of the difference in values. I don’t know how to create this expression.
Any help?
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6 Replies
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Is the text layer a child of the rotating null? Around which axis and in which direction is the null rotating? What’s the relationship between degrees of rotation and pixels of movement?
>higher in “Y”
Do you mean a higher y value (which would be lower) or a more negative y value (which would be higher)?
Dan
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my man dan ebberts, i did first try to look through your site before posting here, thanks for replying.
The text object, and illustrator file is a child of the rotating null. the null is rotating on the Y axis.
I am having a difficult time finding the math to relate the Y rotation of the null to the Y position of the text object.
I believe it’s:
Start
Text object Y -200
Null Rotation -20End Pass out of Frame
Text Object Y +155
Null Rotation +67Attached are some screen shots, ignore the 4 text elements I’m just trying to make it work with 1 first before making it go to all 4.
Who doesn’t fall, cannot rise.
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The text layer’s position expression is probably going to look something like this:
rStart = -20;
rEnd = 67;
yStart = -200;
yEnd = 155;
y = linear(parent.transform.yRotation,rStart,rEnd,yStart,yEnd);
value + [0,y,0]Dan
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amazing, it works. is that an array?
i’m shocked. thanks for taking the time to reply.
Who doesn’t fall, cannot rise.
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The last line adds an array ([0,y,0]) to another array (value–the pre-expression 3D value of the position property).
Dan
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your expression saved me lots of key frames and made it much easier to do any ramps. seriously i can’t thank you enough.
Who doesn’t fall, cannot rise.
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