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Using a Slider To Move Comps from a Circle into a Straight Line
Hello all,
I am working on a music video for my animation course and I need a little help.
I have 5 comps positioned evenly around in a circle. They are all parented to a null with an anchor point in the center of the circle made by the 5 comps. I use the null to rotate all 5 comps around the circle (i.e. spinning a comp on the back side of the circle to the front).
However, I would like to be able to “uncurl” that circle into a straight line, almost as one would unroll a curled-up rug. The positions of these 5 comps are controlled by an expression slider: the value of the slider is the radius of the circle, which scales from the center of the circle.
Is there a way to create a slider that would allow me to curl and uncurl my comps from a circle to a line, and back? I’m not using an Angle Control, as that would create more of a “collapsing” of the circle, like an accordion. I was going for a look like someone was holding a piece of string taught, and then put it into a circle, and then uncurled it back to a line, using a slider. Is this possible?
Thank you so much for your help!
-Daniel
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2 Replies
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How about replacing the five videos with five nulls.
Then make a second set of five nulls and position them along a line.
Now drop your video in there and add two expression-layer sliders. Call them myLayer1 and myLayer2 or something. Set these for each video so that the first one references a null on the circle and the second one references a null in the line.
Now set an expression slider “crossblend”. This should be a value between 0 and 100. You can clamp it by adding the following expression. t = effect(“crossblend”)(“Slider”); t = (t>100?100:(t<0?0:t));
and put the following code in the position attribute...
myBlend = effect(“crossblend”)(“Slider”)/100;
l1 = effect(“myLayer1”)(“Layer”);
l2 = effect(“myLayer2”)(“Layer”);P = ( l1.transform.position*myBlend + l2.transform.position*(1 -myBlend) );
Ben.
this is the average between the two points.
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Dude, Ben you are the MAN!
That worked perfectly! Thanks a million!
-Daniel
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