Electromagnetic Field Visualization

[Filip Vandueren]

You can quickly proto-type this with text layers that have a right pointing arrow: “→”

and a particle text-layer “O”

Each arrow-layer would need an expression for rotation, for 2D that would be:

particleLayer = thisComp.layer("O");
p= position - particleLayer.position;
radiansToDegrees(Math.atan2(p[1],p[0]));

And also an expression for scale, based on the distance towards the central particle. I suppose it would be the inverse square so:

particleLayer = thisComp.layer("O");
strength = 10;
d= length(position - particleLayer.position);
value * strength*(1/Math.sqrt(d));

(this would give an divide by zero error if an arrow is at the exact same location as the particle, but I guess that’s physically accurate 🙂 )

[Sinjin Manta]

Filip, Thank you very much. I was able to use your expressions and apply them to some shape layers to get it working. I’m thrilled. THANK YOU.

[Nawaz Alamgir]

Hi @<b style=”font-family: inherit; font-size: inherit;”>Filip

What code would make the scale of the arrows smaller when closer to the target and no change when far? so basically the opposite..

Thanks

[Filip Vandueren]

value*strength*d;

And tweak strength.

Or, if you want to fine tune and limit it, use a linear() function something like:

linear(d, 0,960, 10,100);