2d vector field
Particle size
Particles per row
Vector length
x=f(pos)
function (pos) { return pos.y; }
y=f(pos)
function (pos) { return -pos.x; }
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3d vector field
Particle size
Particles per row
Vector length
x=f(pos)
function (pos) { return -pos.z / pos.y; }
y=f(pos)
function (pos) { return Math.cos(pos.x / pos.y); }
z=f(pos)
function (pos) { return pos.x / pos.y; }
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