sub method
Implementation
Vector3 sub(v, {Vector3? w}) {
if (w != null) {
print('three.Vector3: .sub() now only accepts one argument. Use .subVectors( a, b ) instead.');
return subVectors(v as Vector3, w);
}
x -= v.x;
y -= v.y;
if (v is Vector3) z -= v.z;
return this;
}