How do a link led between two forms that independently of moving

Hi all

I am looking for many tutorials how to create something like this:

http://turbulence.org/works/MyPocket/graph/

(the video is on the right)

But could not.

I have for each shape, I do 2 circles (move separately) and between them, making a shape that works as a link, related on each circle on the sides... is it clear? I need the link to 'stretch' and follow the two circles...

Do you know if there is a way?

Thanks in advance

m.

Use something like this technique from an old blog post, I did years ago:

I created a layer named string and a layer called Kite. I drew a mask on the layer of string that forms a gentle arc, added the effect of outline with a width of 3 pixels and paint on Transparent selected. The race goes from the left edge to the right edge of the layer in the chain, and it is important. The string layer is slightly narrower than the model to make it easy to work with. The last step with the layer of string is to move the anchor point to the left most vertice point of the mask at exactly a value X 0. It is also important. The two layers are converted to 3D.

The Kite layer is simply a square solid with a mask in the shape of the kite and the anchor point where is used the string.

The following terms are added to the string layer:
String scale:

point1 = position;
point2 = thisComp.layer("Kite").position;
L = length(point1, point2);
w = thisLayer.width;
r = L/w*100;

[r, value[1], value [2]]

String Orientation:

t = thisComp.layer("Kite");
l = thisComp.layer("String");

fromPoint = l.position
atPoint = t.position
lookAt(fromPoint, atPoint)

If you look closely the language, you'll see that I'm calculating the distance between the anchor and then dividing the difference in the width of the layer and multiplying that number by 100 to arrive at a scale factor to make the string layer is always the same length as the distance between the end of the chain and the kite. The part of the Orientation of the expression simply indicates the string to the wing. There is a problem which must be overome. The string layer is perpendicular to the wing and this part is important, the rotation must be changed to-90 to get things to normal. This isn't another expression, it's just a value that you put in.

The kite layer also needs an expression to point the wing at the end of the string. The expression of the orientation of the kite is basically the same as the string Orientation expression with definitions for the to and the reverse point. It looks like this:
Kite Orientation:

t = thisComp.layer("String");
l = thisComp.layer("String");

fromPoint = t.toWorld(position);
atPoint = l.toWorld(thisComp.layer("String").anchorPoint);
lookAt(fromPoint, atPoint)

Now the kite can be moved and the string will follow.

Here's the project file

Here is a movie.

Tags: After Effects

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