Game Development Reference
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Figure A-3. Vector reversal
Vector Addition: The += Operator
This summation operator is used for vector addition, whereby the passed vector is added
to the current vector, component by component. Graphically, vectors are added in tip-
to-tail fashion, as illustrated in Figure A-4 .
Figure A-4. Vector addition
Here's the code that adds the vector u to our Vector class vector:
inline Vector& Vector::operator+=(Vector u)
x += u.x;
y += u.y;
z += u.z;
return *this;
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