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PVector v1 = new PVector(10, 20, 2);
PVector v2 = new PVector(60, 80, 6); 
PVector v3 = v1.cross(v2);
println(v3);  // Prints "[ -40.0, 60.0, -400.0 ]"

.cross(v)
.cross(v, target)
.cross(v1, v2, target)

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