Bind a 2D layer to a 3D layer

OK, I came to my limit of skills of expression.

I have setuped composition 3D, with various elements at various depths. This element is a Sun. I have setuped a camera to make a pan inside of my world in 3D.

So far so good. None of my items are animated.

Now I would like to bind a flare on my Sun, which is a 2D layer. I tried with the expression 'toWorld' and 'toComp', but I get no results because my 'Sun' 3D layer is not mobile. Only my camera (and for some reason I can't turn my lens flare in a 3D layer).

But I can't understand how to calculate the position of my 'Sun' layer inside my computer with an offset from the position of the camera.

I'm sure it's possible, but I'm so bad when it comes to heavy math.

Try to add the expression to the center of lens Flair and not to the strong position. If you also want to animate the flair of the lens slightly change the term for this:

L = thisComp.layer("sun");

value + L.toComp (L.anchorPoint)

Works for me (project file)

Tags: After Effects

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