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# Triggering rotation off multiple layers with sample layer.

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 Triggering rotation off multiple layers with sample layer. on Dec 25, 2014 at 7:40:51 am

Hi,

I have one grid in comp with 84 images (160*160). With expression now, position of yellow layer when passes X axis of image layer rotates Y from 0-180. I will paste this expression on all image layers later. This is ok if animation only use rectangle, but I want to use other shapes (plus) Is it possible to maybe opacity (gradient...color) of this yellow layer to trigger rotation other leyers. This is expression that I use now.

p2 = position[0];
tolerance = .5;
t1=(p1- p2)
t2=(p2-p1)
if (t1 > 80) 0

else if (t1 < 80) linear(t1, 80, -80, 180, 0)
else linear(t2, 0, 160, 180,0)

Igor Stikic

 Re: Triggering rotation off multiple layers with sample layer.on Dec 25, 2014 at 6:42:09 pm

Before you go any further, investigste the possibilities of the Card Dance effect.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA

 Re: Triggering rotation off multiple layers with sample layer.on Dec 29, 2014 at 9:42:21 am

Thank you Dave. I'm familiar with Card Dance effect and it's not possible to create what I want with that effect. I need to have beckside animated which I had accomplished.
Colored shape is moving from right to left.
I want to every image layer rotate Y axis from 0-180 everytime when colored shape touch first edge of image (start rotation) and finish rotation when shape cover whole picture (or touch left edge). Images are 160*160px I manage to create rotation depending on one position point.
Is it possible to create this with sample image expression so that images rotate depending on shape above?

Igor Stikic

 Re: Triggering rotation off multiple layers with sample layer.on Dec 29, 2014 at 4:03:28 pm

You guide the rotation of a layer based on your shape layer with an expression and sampleImage(), but it will be very slow to evaluate and render.

If I were you, I'd consider property-driven ways to do this instead of image-driven ways (i.e., extending Dan Ebberts's follow-the-leader [link] expression).

Walter Soyka