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PVector  v = new PVector(10, 20, 0);
float d = v.dot(60, 80, 0);
println(d);  // Prints "2200.0"

PVector  v1 = new PVector(10, 20, 0);
PVector  v2 = new PVector(60, 80, 0); 
float d = v1.dot(v2);
println(d);  // Prints "2200.0"

.dot(v)
.dot(x, y, z)
.dot(v1, v2)